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mechanical engineering rs khurmi and jk gupta objective & conventional type pdf mechanical engineering objective type question and answers pdf free. Ans: b TOP I.C. Engines - Mechanical Engineering Multiple choice Questions and Answers List I.C. Engines Questions and Answers pdf free download 1. The efficiency of a nuclear power plant in comparsion to a conventional thermal. Mechanical Engineering by RS Khurmi and JK Gupta PDF. Free Download Mechanical Engineering Conventional and Objective Type by RS Khurmi PDF.
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April 7. Popular Files. January June 2. February 6. Trending on EasyEngineering. Verma Book Free Download February July 9. In a naturally aspirated diesel engine, the air is supplied by a a supercharger b a centrifugal blower c a vacuum chamber d an injection tube e forced chamber Like our facebook Page: In loop scavenging, the top of the piston is a flat b contoured c slanted d depressed e convex shaped.
In the crankcase method of scavenging, the air pressure is produced by a supercharger b centrifugal pump c natural aspirator d movement of engine piston e reciprocating pump. Ignition quailty of petrol is expressed by a octane number b cetane number c calorific value d self ignition temperature e distillation temperature. Iso-oct ,ne a has octane number of 0 b has octane number of 50 c has octane number of d is an index of detonation quality e is an index of knocking quality.
Octane number is determined by comparing the performance of the petrol with the following hydrocarbons a iso-octane b mixture of normal heptane and iso-oc-tane c alpha methyl napthalene d mixture of methane and ethane e mixture of paraffins and aromatics. Cetane a has zero cetane number b has cetane number c helps detonation d is a straight chain paraffin e determines the efficiency of an I. Ethyl fluid is used a to increase the octane rating of the fuel b to increase the cetane rating of the fuel c as a defrosting agent d as a superior type of fluid compared to others e to improve lubricating quality of fuel.
The self-ignition temperature of diesel oil compared to petrol is a higher b lower c same d depends on quality of fuel e unpredictable? Normal heptane a accelerates auto-ignition Like our facebook Page: Cetane number is determined by comparing the performance of diesel oil with the following hydrocarbons a cetane b mixture of cetane and alphamethyl napthalene c ethylene dibromide d mixture of aldehydes and ketones e mixture of cetane with tetra-ethyl lead Which is correct statement about reaction time for autoignition of fuel and the fuel air ratio a lean mixture has high reaction time b rich mixture has high reaction time c chemically correct mixture has mini-mum reaction time d all of the above.
Violent sound pulsations within the cylinder of an I. Ignition lag is a the time taken by fuel after injection before top dead center to reach upto auto- ignition temperature b time before actual fuel injection and the pump plunger starts to pump fuel c time corresponding to actual injection and top dead center d time corresopnding to actual ingition and top dead center e none of the above. The spark plug gap is normally maintained at a 0.
The function of a fuel pump in a petrol pump is to a inject fuel in cylinder b supply fuel when carburettor fails c pump fuel so that it reaches carburettor to improve thermal efficiency d does not exist. The delay period in petrol engine is of the order of a 0. Detonation is caused by the following unstable compounds a peroxides, aldehydes and ketones b peroxides, aldehydes, oxides and sul-phides c aldehydes, oxides and ketones d ketones and sulphur compounds e none of the above.
Which is false statement about advantages of V-type engine a compact design requiring lesser space b improved distribution of air to cylinder c casting less liable to distortion d reduced torsional vibration because of shorter crankshaft e less overhead clearance. The pistons are usually given a coating such as tin plating in order to a reduce weight b conduct heat efficiently c reduce possibility of scoring d reduce friction e increase lubrication effect.
Piston rings are usually made of a cast iron b aluminium c phosphor bronze d babbitt e carbon steel. Piston rings are plated with chromium,cadmium or phosphate in order to a reduce cost b improve surface finish c prevent clogging d reduce wear and eliminate scuffing e improve heat transfer.
The top piston ring nearer to the piston crown is known as a compression ring b oil ring c scrapper ring d groove ring e leading ring. In order to prevent knock in the S. Diesel engines have low specific fuel consumption compared to petrol engine. This statement is a not true b true at full load c true at part load d true at both part and full load e there could not be any such criterion. To reduce the possibility of knock in the C. The detonation tendency in petrol engines for specified conditions of fuel rating, compression ratio, speed etc.
According to Recardo's theory, detonation occurs due to a instantaneous auto-ignition of last part of charge to be burnt b improper mixing of air and fuel Like our facebook Page: A fuel will detonate less if it has a higher self ignition temperature b lower self ignition temperature c proper self ignition temperature d self ingition temperature has nothing to do with detonation e none of the above.
The knocking in diesel engines for given fuel, will be a enhanced by increasing compression ratio b enhanced by decreasing compression ratio c unaflected by compression ratio d first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed e dependent on other factors. Injection lag is a the time taken by fuel after injection before top dead center to reach upto auto- ignition temperature b time before actual fuel injection and the pump pluger starts to pump fuel c time corresponding to actual injection and top dead center d time corresponding to actual ignition and top dead center e none of the above.
Ignition quality of diesel-fuel oil is expressed by an index called a octane number b cetane number c calorific value d carbon content e ignition temperature.
For best results of efficient combustion, high speed diesel engines need an approximate cetane number of a b 10 c 50 d 5 e 1. The most popular firing order in case of four cylinder in-line I. The specific gravity of diesel oil Is a 1 b 0. The specific gravity of petrol is about a 0.
Pick up the correct statement. Detonation can be controlled by Like our facebook Page: The efficiency of I. The firing order in a six stroke I. The m. High carbon content in diesel oil used for diesel engine leads to Like our facebook Page: Exhaust pipes of engines are covered with insulating marterial in order to a keep the exhaust pipes warm b reduce formation of condenstae c reduce heat transfer to the engine room d increase engine efficiency e conserve heat.
Ignition timing of a multicylider petrol engine can be adjusted by a rotating the crank b adjusting the spark plug gap c adjusting ignition coil position d rotating the distributor e delaying the spark by increasing capacitor in ignition circuit. Fuel consumption with increase in back pressure will a increase b decrease c remain unaffected d depend on other factors e none of the above. The cooling water requirement for diesel engine is of the order of a 0.
A 4-stroke diesel engine needs about following amount of air a 75 cc per min. Leakage past the piston rings and valve seats in I. With increa. The ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of a 5: For same power and same speed, the flywheel of a four stroke engine as compared to two-stroke I. Air injection in I. Solid injection in I.
The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio.
The minimum value occurs in the range of a lean mixture b chemically correct mixture c rich mixture d unpredictable e none of the above.
The thermal efficiency of a two cycle engine as compared to four cycle engine is a more b less c same d more upto some load and then less e it may be less or more depending on several other factors. Diesel engines as compared to petrol engines require a bigger flywheel b smaller flywheel c same size flywheel d no flywheel e flywheel whose size may be less or more depending on several other fac-tors. The tendency of a diesel engine to knock increases, if a engine speed is increased b engine H.
The tendency of a petrol engine to knock increases by a supercharging b scavenging Like our facebook Page: P, d reducing the spark advance e increasing cetane number of fuel. Free acids in diesel oil for diesel engine lead to a production of highly corrosive gases corroding the cylinder walls and exhaust system b excessive engine wear c damaging of both the storage tank and the engine d deposition on engine parts e excessive fuel consumption.
The thermostat in I. The brake mean effective pressure of an I. High ash and sediment in diesel oil used in diesel engine lead to a production of highly corrosive gases corroding the cylinder walls and ex-haust system b excessive engine wear c damaging of both the storage tank and the engine d deposition on engine parts e blocking of exhaust pipes.
Mixing of fuel and air in case of dies engine occurs in a injection pump b injector c inlet manifold d carburettor e engine cylinder. The advantage of reversing the flow of a in an air cleaner is to a increase velocity of air b increase air flow c reduce the velocity of air d throw out a large percentage of foreig matter e cool the air.
Fins are provided over engine cylinder scooters for a higher strength of cylinder b better cooling c good appearance d higher efficiency e easier handling and ease in manufacturing. The elements of most concern in regard pollution caused by engines are a CO and C02 b CO and hydrocarbons c C02 and hydrocarbons d carbon and dust e hot products of combustion The preferred location of an oil cooler is a before the filters b after the filters c between the filters d before and after the filters e any where.
The petrol from tank to the automotive ergine is fed by a gravity b pump run by engine c suction pressure created by, suctio stroke d capillary action e fuel pump. In petrol engine, increase of cooling water temperature will a increase the knocking tendency b decrease the knocking tendecny c not affect the knocking tendency d increase or decrease knocking tendency depedning on strength and time of spark e unpredictable. In carburettors, the top of the fuel jet with reference to the level in the float Like our facebook Page: Carburretion is done to a feed petrol into cylinder b govern the engine c break up and mix the petrol with air d heat up the charge to cylinder e scavenge the cylinder.
Power impulses from an I. The theoretically correct mixture of air and petrol is approximately a 8: The following type of carburettor is preferred a concentric type b eccentric type c horizontal type d vertical type e none of the above. In the passanger cars, the following type of carburettor is preferred a horizontal type b downward draught type c upward draught type c inclined draught type e any one of the above types.
The essential equipment for producing high vlotage for sparking in petrol engines with battery is a ignition coil b ignition coil and distributor c ignition coil and condenser d ignition coil and contact breaker e ignition coil, contact breaker and con-denser. The ignition coil in diesel engines produces voltage of the order of a 6 to 12 volts b volts c volts d 20, volts e 80, volts.
If the door of a diesel engine crankcase is opened just after shutdown before cooling of engine, then a efficiency of engine will be poor b there is a risk of explosion taking place c it is the safest practice d some parts may be subjected e some lub oil may be wasted. Theoretically, the following engine should have maximum efficiency a gas engine b 2-stroke S. In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will a increase the knocking tendency b decrease the knocking tendency c not affect the knocking tendency d increase or decrease knocking tendency depending on strength and time of spark e unpredictable.
High sulphur content in diesel oil used for diesel engines leads to a production of highly corrosive gases corroding the cylinder walls and exhaust system b excessive engine wear c damaging of both the storage tank and the engine d deposition on engine parts e reduction in thermal efficiency.
The basic requirement of a good combustion chamber is a high compression ratio b low compression ratio c low volumetric efficiency d minimum turbulence e high power output and high thermal efficiency. Deposition of carbon in petrol engine cylinder would result in increase of a clearance volume b swept volume c compression ratio d volumetric efficiency e mean effective pressure. Which of the following engines can work on very lean mixture a S. If petrol is used in a diesel engine, then Like our facebook Page: In turbulence chamber in diesel engine a the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of fuel mixture b fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat c only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge d there are no valves e fuel is partly burnt by spark.
For low load operation, more suitable economical engine is a S. A two stroke crank compressed engine has following ports in the cylinder a suction port and exhaust port b transfer port only c suction port and transfer port d transfer port and exhaust port e suction port, exhaust port and transfer port. For the same size and weight, a two stroke engine as compared to four stroke engine will generate power a about twice b about 0.
A two stroke engine is usually identified by a size of flywheel b weight of engine c type of lubrication system Like our facebook Page: If diesel is fed by mistake in the oil tank of a petrol engien, then engine will a give lot of smoke b detonate c knock d not run e run for some time and then stop.
Method of governing used in petrol engine is a quantity governing b quality governing c combined governing d partial governing e hit and miss governing. Pick up false statement a For petrol and large gas engines, quantity governingds preferred b In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load c In hit and miss governing, fuel supply is completely cut off during one or more number of cycles d In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied e For close regulation of speed, combination of both quality and quantity governing is used.
Method of governing used in diesel engine is a quantity governing b quality governing c combined governing d partial governing e nit and miss governing. An engine has a normal speed of r.
The efficiency of a nuclear power plant in comparsion to a conventional thermal power plant is a same b more c less d may be less or mote depending on size e unpredictable. Isotopes of same elements have a same atomic number and different masses b same chemical properties but different atomic numbers c different masses and different atomic numbers d different chemical properties and same atomic numbers e same chemical properties and same atomic numbers.
Atomic number of an element in the periodic table represents the numbers of a protons in the nucleus b electrons in me nucleus c neutrons in the nucleus d electrons in the atom e neutrons in the atom. The mass number of a substance represents the sum of total number of Like our facebook Page: Which is not identical for an atom and an isotope a mass number b atomic number c chemical properties d position in periodic table e all of the above.
A nuclear unit becoming critical means a it is generating power to rated capacity b it is capable of generating much more than rated capacity c there is danger of nuclear spread d chain reaction that causes automatic splitting of the fuel nuclei has been established e it generates no heat.
Moderator in nuclear plants is used to a reduce temperature b extract heat from nuclear reaction c control the reaction d cause collision with the fast moving neutrons to reduce their speed e moderate the radioactive pollution.
The most commonly used moderator in nuclear plants is a heavy water b concrete and bricks c graphite and concrete d deutrium e graphite. The nuclear energy is measured as a MeV Like our facebook Page: Breeder reactor has a conversion ratio of a unity b more than unity c less than unity d zero e infinity.
Boiling water reactor employs a boiler b direct cycle of coolant system c double circuit system of coolant cycle d multi pass system e single circuit system.
Fast breeder reactor uses a boiler b direct cycle of coolant system c double circuit system of coolant cycle d multi pass system e single circuit system. One gram of uranium will produce energy equivalent to approximately a 1 tonne of high grade coal b 4. Which of the following nuclear reactor does not need a heat exchanger for generation of steam a gas cooled b liquid metal cooled Like our facebook Page: The number of isotopes of hydrogen are a 1 b 2 c U c 3 e 0 Ans: The commonly used material for shielding is a lead or concrete b lead and tin c graphite or cadmium d thick galvanised sheets e black carbon papers.
The main interest of shielding in nuclear reactor is protection against a X-rays b infra-red rays c a, P, and y rays d neutrons and gamma rays e electrons. Reflector in nuclear plants is used to a return the neutrons back into the core b shield the radioactivity completely c check polllution d conserve energy e is not used.
The energy required to be applied to a radioactive nucleus for the emission of a neutron is a 1 MeV b 2.
Ferrite material is a the most fissionable material b the basic fuel for nuclear paints c basic raw material for nuclear plants d the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material e none of the above. Which of the following particles is the lightest a nucleus b electron c proton d meson e neutron.
Which of the following is the heaviest a neutron b proton c atom d electron e nucleus. In fast breeder reactors a any type of moderator can be used b graphite is used as the moderator c heavy water is used as the moderator d moderator may or may not be used e moderator is dispensed with. In nuclear fission each neutron that causes fission releases a no new neutron b at least one new neutron c one new neutron d more than one new neutrons Like our facebook Page: Gas cooled reactor uses following materials as moderator, and coolant a graphite, C02 b graphite, air c heavy water, C02 d lead, H2 e concrete, N2.
A nuclear fission produces energy of following order in MeV a 20 b c d 20, e 2 x The process by which a heavy nucleus is splitted into two light nuclei is known as a splitting b fission c fusion d disintegration e chain reaction. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is a same b more c less d there is no such criterion e none of the above.
The fast breeder reactor uses the following moderator a demineralised water b carbon dioxide c heavy water d graphite Like our facebook Page: The nuclear power plant at Tarapur has the following reactor a fast breeder b pressurised water c boiling water d sodium graphite e none of the above. Boiling water reactor uses the following as moderator, coolant and working fluid a ordinary fluid b heavy water c molten lead d hydrogen gas e none of the above.
Ideally the neutron flux in reactor should be a maximum in center and zero at side b maximum at side and zero in center c uniform throughout d zero throughout e none of the above.
U will undergo fission by a high energy fast neutrons alone b low energy slow neutrons alone c either fast or slow neutrons d medium energy neutrons e none of the above. A reactor capable of converting a ferrite material into fissile isotopes is called a regenerative reactor b fast breeder reactor c breeder reactor d boiling water reactor e ferrite reactor. Hydrogen is preferred as better coolant in comparison to C02 because former a is lighter b is inert c has high specific heat d is a good conductor e all of the above.
Natural uranium is made up of a The risk of radioactive hazard is greatest in the turbine with following reactor a pressurised water b boiling water c gas cooled d liquid metal cooled e all of the above. Plutonium is produced a as basic raw material b by neutron irradiation of Uz c by neutron irradiation of throium d artificially e in high capacity furnace. Electron-volt is the unit of Like our facebook Page: Pick up the wrong statement a In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.
Pick up the wrong statement Fast breeder reactors a operate at extremely high power densities. Uranium is produced a as basic raw material b by neutron irradiation of Uz c by neutron irradiation of thorium d artificially e in high capacity furnaces. Which of the following type of pump is used in liquid metal cooled reactor for Like our facebook Page: Which of the following is the primary fuel a Ulii b U c U d Pu: A pressurised water reactor employs pressuriser for the following application a to maintain constant pressure in primary circuit under varying load b to Supply high pressure steam c to increase pressure of water in primary circut d to provide subcooled water at high pressure e all of the above.
Which of the following can be used as a coolant in nuclear plant a light or heavy water b molten lead c carbon dioxide d freon e carbon tetrachloride. Reactors for propulsion applications use a natural uranium b molten lead c any form of uranium d thorium e plutonium. The function of control rods in nuclear plants is to a control temperature b control readioactive pollution c control absorption of neutron Like our facebook Page: Breeder reactors employ liquid metal coolant because it a acts as good moderator b produces maximum steam c transfers heat from core at a fast rate d breeds neutrons e increases rate of reaction in core.
In triggering fission, which type of neutrons are more effective a fast b slow c in bulk d static e activated. For economical operation of a nuclear plant a used fuel should be reprocessed b moderator should be used c coolant should be employed d control rods should be used e reflector should be used. The size of the reactor is said to be critical when a chain reaction can be initiated b it becomes uncontrollable c it explodes d it produces no power e it produces tremendous power.
When a reactor becomes critical, then the production of neutrons is a infinite b zero c exactly balanced by the loss of neutrons through leakage d initiated e stopped. In the breeder reactors the generation of new fissionable atom is a at the lower rate than the consumption b at a higher rate than the constuption c at an equal rate of the consumption d depends on other considerations e unpredictable.
The energy produced by a thermal reactor of same size as a breeder reactor is a almost same b slightly more c slightly less d much less e much more. Reactors designed for propulsion applications are designed for a natural uranium b enriched uranium c pure uranium d any type of uranium e none of the above.
Supertheated steam is generated in following reactor a boiling water b gas cooled c pressurised water d all of the above e none of the above. Solid- fuel for nuclear reactions may be fabricated into various small shapes such as a plates b pallets c pins d any one of the above e none of the above.
Which of the following is more appropriate for a moderator. One which a does not absorb neutrons b absorbs neutrons c accelerates neutrons d eats up neutrons e regenerates neutrons.
A fission chain reaction in uranium can be developed by a slowing down fast neutrons so that Uz fission continues by slow motion neutrons b accelerating fast neutrons c absorbing all neutrons d using moderator e enriching U In triggering fission, the following types of neutrons are desirable a fast moving b slow moving c critical neutrons d neutrons at rest e none of the above.
Effective moderators are those materials which contain a light weight atoms b heavy weight atoms c critical atoms d zero weight atoms e there is no such criterion. The following present serious difficulty in designing reactor shield a alpha particles b beta particles c thermal neutrons d fast neutrons and gamma rays e none of the above. In nuclear fission a the original elements change into completely different elements b the electrons of the element change c the molecules rearrange themselves to form other molecules d none of the above.
In order to have constant clain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be a greater than 1.
Each fission of U produces following number of fast neutrons per fission a 1 neutron b 1 — neutrons c 1 - 2 neutrons d 2 — neutrons e infinite.
A fast breeder reactor uses following as fuel a enriched uranium b plutonium c thorium d U e natrual uranium. A boiling water reactor uses following as fuel a enriched uranium b plutonium c thorium d U e natural uranium. A fast breeder reactor a uses graphite rods as moderator b has powerful moderator c has no moderator d uses ferrite material as moderator e uses pressurised water as moderator. Artificial radioactive isotopes find application in a power generation b nucleonic devices c nuclear fission d nuclear fusion e medical field.
Half life of a radioactive isotope corresponds to the time required for half of the following to decay Like our facebook Page: Pressurised water reactor isdesigned a for boiling pi water in the core b to use liquid sodium metal as coolant c to use intermediate coolant d to prevent the water coolant from boiling in the core e to eliminate the coolant loop of the pressurised water.
The coolant used in boiling water reactor is a Co2 b pressurised water c mixture of water and steam d liquid metal e mercury. In boiling water reactor, moderator is a coolant itself b ferrite rod c graphite rod d liquid sodium metal e blanket of thorium.
The most practical fuel for a thermo-nuclear reactor, both from econocical and nuclear consideration is a plutonium b uranium c deuterium d thorium e lithium. The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is a higher cost of nuclear fuel b high initial cost c high heat rejection in condenser d lower temperature and pressure condi-tions e nuclear hazard risk.
The presence of reflector in nuclear power plants results in Like our facebook Page: The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be a more b less c same d zero e negative, i. For water, at pressures below atmospheric, a melting point rises slightly and boiling point drops markedly b melting point rises markedly and boiling point drops markedly c melting point drops slightly and boiling point drops markedly d melting point drops slightly and boiling point drops slightly e none of the above.
At very low temperature, the melting and boiling temperatures become equal. The critical pressure at which latent heat of vaporisation is zero is a The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is a less b more c equal d may be less or more depending on temperature e unpredictable. The saturation temperature of steam with increase in pressure increases a linearly b rapidly first and then slowly c slowly first and then rapidly d inversely e none of the above.
Coke is produced by a pulverising coal in inert atmosphere b heating wood in a limited supply of air at temperatures below GC c strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel d binding the pulverised coal into brick-etts e enriching carbon in the coal. Heating of dry steam above saturation temperature is known as a enthalpy b superheating c supersaturation d latent heat e super tempering. Superheating of steam is done at a constant volume b constant temperature c constant pressure d constant entropy e constant enthaply.
The specific volume of steam with increase in pressure decreases a linearly b slowly first and then rapidly c rapidly first and then slowly d inversely e none of the above. The coal requirement per kW hour generation in the thermal power plant is of the order of a 0. Sublimation region is the region where a solid and vapour phases are in equi-librium b solid and liquid phases are in equilibrium c liquid and vapour phases are in equilibrium d solid, liquid and vapour phases are in equilibrium e none of the above.
Stoichiometric quantity of air is the a air present in atmosphere at NTP conditions b air required for complete combustion of fuel with no excess air c air required for optimum combustion so as to have reasonable excess air d air required to convert CO into C02 e air required to form an explosive mixture. One kg of steam sample contains 0. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by a throttling calorimeter b separating calorimeter c combined separating and throttling calorimeter d bucket calorimeter e none of the above.
On Mollier chart, flow through turbine is represented by ' a horizontal straight line b vertical straight line Like our facebook Page: A wet vapour can be completely specified by a pressure only b temperature only c dryness fraction only d specific volume only e pressure and dryness fraction. On Millier chart, the constant pressure lines a diverge from left to right b diverge from right to left c are equally spaced throughout d first rise up and then fall e none of the above.
On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by a horizontal straight line b vertical straight line c straight inclined line d curved line e none of the above. In a throttling process a steam temperature remaisn constant b steam pressure remains constant c steam enthalpy remains constant d steam entropy remains constant e steam volume remains constant.
In a throttling process a heat transfer takes place b work is done by the expanding steam c internal energy of steam changes d all of the above e none of the above. The latent heat of steam with increase of pressure a remains same b increases Like our facebook Page: At critical point, i. At which pressure the properties of water and steam become identical a 0. In an experiment to determine dryness fraction of steam, the mass of water separated was 1. While steam expands in turbines, theoretically the entropy a remains constant b increases c decreases d behaves unpredictably e none of the above.
Heating wet steam at constant temperature is heating it at constant a volume b pressure c entropy d enthalpy e none of the above.
Adiabatic process is a essentially an isentropic process b non-heat transfer process Like our facebook Page: The state of vapour under saturation condition is described by a pressure alone b temperature alone c pressure and temperature d pressure and dryness fraction e dryness fraction alone.
Pick up the wrong statement about critical condition of steam a latent heat is zero b liquid directly becomes steam c specific volume of steam and liquid is same d this is the maximum pressure limit e all properties of liquid and steam are same.
Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to a kgm b kgm c kgm d kgm e 75 kgm. The evaporation of The increase in pressure a lowers the boiling point of a liquid b raises the boiling point of a liquid c. During polytropic process a heat transfer takes place across cylinder walls b work is done c steam may be wet, dry or superheated after expansion d all of the above e none of the above. Hygrometery deals with the a Hygroscopic substances b water vapour in air c temperature of air d pressure of air e density measurement.
Orsat meter is used for a gravimetric analysis of the flue gases b volumetric analysis of the flue gases c mass flow of the flue gases d measuring smoke density of flue gases e none of the above. Alkaline pyrogallate is used in Orsat's apparatus for absorption of a C02 b CO c 02 d N2 e none of the above. An ideal regenerative cycle is a equal to carnot cycle b less than carnot cycle c more than carnot cycle d could be anything Like our facebook Page: Efficiency of rankine cycle can be increased by a decreasing initial steam pressure and temperature b increasing exhaust pressure c decreasing exhaust pressure d increasing the expansion ratio e increasing number of regenerative heaters.
Cochran boiler is a a horizontal fire-tube boiler b horizontal water-tube boiler c veritcal water-tube boiler d vertical fire tube boiler e forced circulating boiler. Efficiency of a thermal cycle increases by a regeneration b reheating of steam c both a and b d cooling of steam e none of the above. Which of the following gases has the highest calorific value a producer gas b coal gas.
The diameter of Cornish boiler is of the order of a m b 1.
The lenght of Cornish boiler is of the order of a m b m c The diameter of fire tube of Cornish boiler compared to its shell is a one half b one third c one-fifth d two-fifth e three-fifth. Steam engine operates on a carnot cycle b joule cycle c Stirling cycle d brayton cycle e none of the above. The change in internal energy in steam engines equals to a work done during the rankine cycle ; b work done during compression. Water tube boilers are those in which a flue gases pass through tubes and water around it b water passes through the tubes and flue gases around it c work is done during adiabatic expansion d change in enthalpy e none of the above.
Locomotive type' boiler is a horizontal multitubular water tube boiler b water wall enclosed furnace type c vertical tubular fire tube type d horizontal multi-tubular fire tube type e none of the above types. Fire tube boilers are those in which a flue gases pass through tubes and water around it b water passes through the tubes and flue gases around it c forced circulation takes place d tubes are laid vertically e none of the above.
Which of the following substance will have same percentage in both proximate and ultimate analysis a ash b volatile matter c moisture d hydrogen e none of the above. The number of flue tubes in Lancashire boiler is Like our facebook Page: Which of the following is a fire tube boiler a locomotive boiler b Babcock and Wilcox boiler c Stirling boiler.
Which of the following is a water tube boiler a locomotive boiler b Cochran boiler c Cornish boiler d Babcock and Wilcox boiler e Lancashire boiler. The diameter of cylindrical shell of the Lancashire boiler is of the order of a 1 tp 1. A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are a supplied by same manufacturer loose and assembled at site b supplied mounted on a single base c downloadd from several parties and packed together at site d packaged boiler does not exist e none of the above.
Which of the following coals has the highest calorific value a anthracite coal Like our facebook Page: The crown of the fire box is made hemispherical in order to a give maximum space b give maximum strength c withstand pressure inside boiler , d resist intense heat in fire box e enable easy,manufacture.
Which of the following is steam dbal a non-coking bituminous coal b brown coal c pulverised coal d coking bituminous coal e none of the above.
The fire tubes in, a Coarran and Scotish marine boiler are a horizontal b vertical c inclined d both horizontal and vertical e horizontal and inclined. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is a one-half b one-third c one-fourth d one-fifth e two-fifth. The basic purpose of drum in boiler is to a serve as storage of steam b serve as storage of feed water for water wall c remove salts from water Like our facebook Page: Duplex feed pumps are used in small steam boilers.
These operate on the principle of a centrifugal pump b axial flow pump c gear pump d ejector pump e reciprocating pump. The best suited coal for chain or travelling grate stoker boiler is a coking coal b non coking or free burning coal c pulverised coal d high sulphur coal e least ash content coal.
In natural circulation type boiler, a heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum b water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam c feed pump is employed to supplement natural circulation in water wall type furnace d water is converted into steam in one.
Hard coke is used in a cement industry b thermal power plant c blast furnace d domestic use e locomotives Ans: Pick up the correct statement as regards Cornish boiler and Lancashire boiler Like our facebook Page: Locomotive boiler is of the following type a multitubular b horizontal c internally fired d mobile e all of the above.
The shell diameter and length of locomotive boiler are a 1. The diameters of fire tubes and superheaer tubes in locomotive boiler are a The water tubes in a babcock and wilcox boiler are a horizontal b vertical c inclined d horizontal and inclined e vertical and inclined. Which of the following varieties of coals is mostly used in steam boilers a non-coking bituminous coal b brown coal c peat Like our facebook Page: The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is a more b less c same d could be more or less depending on other factors e none of the above.
The function of injector used in small steam plants is to a create vacuum in furnace b create vacuum at turbine exhaust c pump feed water d dose chemicals in feed water e control steam temperature by injecting water.
Which of the following boilers is best suited to meet fluctuating demands a babcock and wilcox b locomotive c lancashire d cochran e comish. In accelerated circulation type boiler a heating takes place at bottom and the water supplied at bottom gets converted into the mixture of stdam bubbles and hot water which rise to durm b water is supplied in drum and through downcomers" located in atmospheric conditon it passes to the water wall and rises to durm in the from of mixture of water and steam Like our facebook Page: Pick up the wrong statement about water tube boiler in comparison to fire tube boilers a former generates steam at high pressure b former occupies less space for same power c rate of steam flow is more in former case d former is used for high installed capacity e chances of explosion are less in former case.
The number of drums in Benson steam generator is a one b two c one steam drum and one water drum d no drum e none of the above. A fusible plug is fitted in small boilers in order to a avoid excessive build up of pressure b avoid explosion c extinguish fire if water level in the boiler falls below alarming limit d control steam dome e remove molten aslj.
The fusible plug in small boilers is located a in the drum b in the fire tubes c above steam dome d over the combustion chamber e at the inlet of chimney. Fusible plug for boilers is made of fusible metal containing tin, lead, and a bismuth b copper c aluminium d nickel e iron. Boiler H. In forced recirculation type boiler, a heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum b water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam c feed pump is employed to supplement natural circulation in water wall type furnace d water is converted into steam in one pass without any recirculation e heating of water takes place in stages.
The ratio of heat utilised to produce steam and the heat liberated in furnace is known as a boiler effectiveness b boiler evaporative capacity c factor of evaporation d equivalent evaporation e boiler efficiency. It is required to produce large amount of steam at low pressure. Which boiler should be used? The overall efficiency of thermal power plant is a boiler efficiency, turhine efficiecny, generator efficiency b all the three above plus gas cycle efficiency c carnot cycle efficiency d regenerative cycle efficiency e rankine cycle efficiency.
Which type of boiler can meet rapid changes of load a vertical fire tube type b horizontal fire tube type c horizontal water tube type d vertical water tube type e forced circulation type. In forced circulation type boiler a heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum b water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam c feed pump is employed to supplement natural circulation in water wall type furnace d water is converted into steam in one pass without any recirculation e water is heated in a large number of tubes.
Boiler stays are used to a prevent flat surfaces under pressure from tearing apart b take care of failure in shear c take care of failure in compression d provide support for boiler e provide foundation of boiler. The radius of a dished head is taken approximately as a one-fourth Like our facebook Page: Size of boiler tubes is specified by a mean diameter and thickness b inside diameter and thickness c outside diameter and thickness d outside diameter and inside diameter e outside diameter alone.
The heat loss in a boiler takes place in the form of a heat carried away by flue gases b heat carried away by ash c moisture present in fuel and steam formed by combustion of hydrogen in fuel d radiation e all of the above. The major axis of elliptical manholes on the shell should be provided a longitudinally b circumferentially c on dished end d anywhere e vertically.
In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine a lancashire boiler b locomotive boiler c babcock and wilcox boiler d cochran boiler e benson boiler. With increase in load, radiant superheater has a drooping characteristic b lihear characterisstic c rising characteristic d flat characteristic e none of the above. With increase in load, convection superheater has a drooping characteristic b linear characterisstic Like our facebook Page: The diameter of fire tubes in Cochran boiler is of the order of a 2 cm b 6 Cm , C 8 cm d 12 cm e 15 cm.
In a recuperative air preheater, the heat is transferred a from a metal wall from one medium to another b from heating an itermediate material and then heating the air from this material c by direct mixing , d heat is transferred by bleeding some gases from furnace e none of the above. A safety valve in a locomotive starts leaking. The leaking medium will be a water b dry steam c wet steam d super heated steam e supersaturated steam.
In regenerative air preheater, the heat is transferred a from a metal wall from one medium to another b from heating an intermediateanaterial and then heating the air from this material c by direct mixing d heat is transferred by bleeding some gas from furnace e none of the above. In designing air preheater, the important design consideration is that a approach temperature should be as low as possible b handling and maintenance should be easier c heat transfer area should be optimum Like our facebook Page: The pressure of reheat steam after passing through reheater compared to inlet condition is a more b less c equal d may be more or less depending on capacity of reheater e none of the above.
The function of injector used in small capacity boilers is to a create vacuum b inject chemical solution in feed pump c pump water, similar to boiler feed pump d add make up water in the system e none of the above.
The safety valve at superheater as compared to drum safety valve setting is set at a higher value b lower value c same value d any value e none of the above. The height of chimney in a power plant is governed by a the draft to be created b limitation of construction facilities c control of pollution d quantity of flue gases to be handled e all of the above. Steam exhaust from high pressure turbine is reheated in a boiler drum b superheater tubes c economiser d a separate coil e a separate coil located in convection path.
Vacuum for reciprocating steam engines compared to steam turbines is a more b equal c less Like our facebook Page: Expanding steam to a very low prseeure high vacuum in steam engines is a desirable b economical c essential d optional e uneconomical. In locomotives, the draught is produced by a chimney b induced draft fan c both combined a and b d steam jet draught e none of the above. Reheating of steam under ideal conditions takes place at constant a entropy b enthaply c pressure d temperature e all of the above.
The maximum discharge through a chimney occurs when the height of chimney is a infinitely long b around meters c equal to the height of the hot gas column producing draught d outside temperature is very low e more than the tallest building nearby.
Proximate analysis of fuel is determination of percentage of a carbon, hydrogen, nitrogen, sulphur, moisture b fixed carbon, ash, volatile matter, moisture c higher calorific value d lower calorific value e rough analysis. Which device is used in thermal power plants to reduce level of pollution a induced draft fan b smoke meter c chimney d precipitator Like our facebook Page: Bomb calorimeter is used to determine a Higher calorific value at constant volume b Lower calorific value at constant volume , c Higher calorific value at constant pressure d Lower calorific value at constant pressure e None of the above.
Ultimate analysis of fuel is determination of percentage of a carbon, hydrogen, nitrogen, sulphur, moisture b fixed carbon, ash, volatile matter, moisture c higher calorific value b lower calorific value e best analysis. For combutsion of a fuel, following is essential a correct fuel air ratio b proper ignition temperature c 02 to support combustion d all the three above e none of the above. Spontaneous combustion is a phenomenon in which a all the fuel burns instantaneously producing high energy release b fuel burns with less air c coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal d explosion in furnace e none of the above.
The economiser is used in boilers to a increase thermal efficiency of boiler b economise on fuel c extract heat from the exhaust flue gases d increase flue gas temperature e to heat feed water by bled steam.
An economiser in a boiler a increases steam pressure b increases steam flow c decreases fuel consumption d decreases steam pressure Like our facebook Page: Primary air is the air used to a provide air around burners for obtaining optimum combustion b transport and dry the coal c convert CO formed in lower zone of furnace into C02 at higher zone d air-delivered by forced draft fan e none ot the above.
Sulphur content of fuels is very important to the plant operators because it a has high heating value b retards electric precipitation c promotes complete combustion d has highly corrosive effect e facilitates ash removal. Gusset stays in a boiler are provided to a prevent the bulging of flat surfaces b avoid explosion in furnace c prevent leakage of hot flue gases d support furnace freely from top e prevent atmospheric air leaking into furnace.
Water and sediment in fuel oil can be removed by a heating the oil in the settling tanks b cooling the oil in the settling tanks c burning the oil d suspension e filtering. Pour point of fuel oil is the a lowest temperature at which oil will flow under set condition b storage temperature c temperature at which fuel is pumped through burners d temperature at which oil is transported e none of the above.
Secondary air is the used to a provide air around burners for obtaining optimum combustion b transport and dry the coal c convert CO formed in lower zone of furnace into C02 at higher zone d air delivered by induced draft fan e air fed to pulverisers. The behaviour of coal in a furnace is determained by a the content of sulphur b the content of ash and heating value c the proximate analysis d the exact analysis e its type.
Pick up wrong statement about desired properties of a good fuel a high calorific value b produce minimum smoke and gases c ease in storing d high ignition point e ecomomical Ans: Sulphur in coal results in a causing clinkering and slagging b corroding air heaters c spontaneous combustion during coal storage d facilitating ash precipitation e all of the above. Caking coals are those which Like our facebook Page: Green coal, in order to be burnt, must be a heated sufficiently b burnt in excess air c heated to its ignition point d burnt as powder e burnt as lumps.
The ultimate analysis of fuel lists a various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per- cents by volume b various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per- cents by weight c fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash d fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash e moisture and ash free heating value.
The proximate analysis of fuel lists a various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per- cents by volume b various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per- cents by weight c fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash d fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash e moisture and ash free heating value.
Tertiary air is the air used to a provide air around burners for obtaining optimum combustion b transport and dry the coal c cool the scanners d supply air for ignitors e convert CO formed in lower zone of furnace into C02 at higher zone. The safety valve on boiler drum compared to safety valve on superheater is set at a same value Like our facebook Page: Which is not correct statement about pulverised fuel firing a high burning rate is possible b heat release can be easily controlled c fuel burns economically d it is the best technique for burning high ash content fuel having low fusion ash e separate mills are required to powder the coal.
The three "Ts" for good combustion are a temperature, time, and turbulance b total air, true fuel, and turbulance c thorough mixing, total air, and temperature d total air, time, and temperature e none of the above.
Which is not correct statement about the function of furnace a to provide proper conditions for con-tinuous complete combustion b mix fuel with air and ignite c separate ash from coal d maintain heat supply to prepare and ignite the incoming fuel e to minimise radiation losses.
Which is not correct statement about effect of sulphur in fuel a it has heating value b it helps in electrostatic precipitation of ash in flue-gases c it leads to corrosion of air heaters, ducting, etc. Heating value of fuel used is as on fired basis.