gobinda objective

8/9/2019 Gobinda Objective

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1) The commerical sourace of energy area.solar,wind biomass b.fissile fuels,hydropewer and nuclear energyc.wood,animal wastes and agriculture wastes d.none of the above

2) Non_commerical sources of energy area.wood,animal wastes and agricultural wastes b.solar,wind, biomassc. fossil fuels,hydropower and nuclear power d.none of above

3)The primary source of the energy area.coal, oil and uranium b.hydrogen, oxygen and waterc.wind,biomass and geothermal d.none of the above

4) The secindary sources of the energy area.solar, wind and water b.coal, oil and uraniumc.none of the above5)In india largest power station is located ata.Kota b.Sarnic.Chandrapur d.Neyveli6) The percentage O2 by weight in atmosphere air isa.18% b.23%c.77% d.79%

7) The percentage O2 by volume in atmosphere air isa.21% b.23%

c.77% d.79%8)The proper indication of incomplete combution isa. high co content in flue gases at exit b. high CO2 content in flue

gases at exitc. high temperature of flue gases d. the smoking exhaust from

chimney9) The main sourc of production of biogas isa.human waste b. wetcow dungc.wet livestock waste d. all above10) India first nuclear power palnt was installed ata.Tarapore b. Kotac. Kalpakkam11) In fuelcell ,the _ --------------energy is converted into electrical

energya. Mechanical b.Chemicalc. Heat d.Sound12) Solar thermal power generation can be achived bya. using focusiing collector or heliostates b. using flat plate colletersc.using a solar pond d. any of the above the system13) The energy radiated by sun on a bright sunny day is

approximatelya.700 w/m^2 b.800 w/m^2c.1 kw/m^2 d.2 kw/m^214)Thorium Breeder Reactors are most suitable for India becausea. these develope more power b. its techonology is simplec.abundance of thorium deposits are available in India d.they can be

easily designed15)Rakine cycle is aa. reversibe b.irreversible cyclec.constant volume cycle d.none of the above

16)The overallefficiency of thermal power plant is equal toa.Rankinecycle efficency b.Carnot cycle efficiencyc.Regenerative cycle efficiency d.Boiler efficiency *turbine

efficiency*generator efficency17)Rankine cycle efficency of a good steam power plant may be in the

range of


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a. 15to20% b.35to45%c.70to80% d.90to9518)Rankine cycle operating on low pressure limit op

P1 and high pressure limit of P2a.has higher thermal ifficency than the Carnot cycle operating between

same pressure limitsb.has lower thermal ifficiency than Carnot cycle operating between

same pressure limitsc.has same thermal efficency as Carnot cycle operating between same

pressure limits 'd.may be more or less depending upon the magnitude of P1 and P2

19)Rankine efficiency of a steam power planta. improves in summer as compared to that in winterb.improves in winter as compared to that in summerc.is unaffected by climatic conditions d. none of the above20)Carnot cycle comprise ofa.two isentropic processes and two constant volume processesb.two isentropic processes and two constant pressure processesc.two isothermal processes and two constant pressure processesd.none of the above

21) In Rankine cycle the work output from the turbine is given bya.change of internal energy between inlet and outlet b. change of

enthalpy between inlet and outlet ]c.change of entropy between inlet and outlet d. change of temp

between inlet and outlet22) Regenerative heating i.e bleeding steam to reheat feed water to

boiler 'a.decreases thermal efficency of the cycle b. increase thermal

efficency of the cycle'c.does not affect thermal efficiency of the cycled.may increase or decrease thermal efficency of the cycle depending

upon the point of extraction of steam23) Regerative cyclethermal efficiency

a.is always greater than simple rankine thermal efficiencyb.is greater than simple Rankine cycle thermal efficency only when

steam is bled at particular pressurec.is same as simple Rankine cycle thermal efficiencyd.is always less than simple Rankine cycle thermal efficiency

24) In a regerative feed heating cycle, the opimum value of the fraction ofsteam extracted for feed heating

a.decreases with increase in Rankine cycle efficiency b.increases withincrease in Rankine cycle efficiency

c.is unaffected by increase in Rankine cycle efficiency d.none of theabove25) In a regerative feed heating cycle ,the greatest economy is affected

a.when steam is ixtracted from only one suitable point of steam turbine

b.when steam is extracted from several places in different stages ofsteam turbinec.when steam is extracted only from the last stage of steam turbined.when steam is extracted only from the first stage of steam turbine

26)The maximum percentage gain in regenerative feed heating cyclethermal efficiency

a.increases with number of feed heaters increasing b.decreases withnumber of feed heaters increasing

c.remains same unaffected by number of feed heaters d.none of theabove


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27.In regenrative cycle feed water is heated bya .exhaust gases b. heatersc.draining steam from the turbine d.all above

28) Reheat cycle in steam power plant is used toa.Utilise heat of flue gases b.increase thermal efficiencyc.improve condenser performance d.reduce loss of heat29) Mercury is a choice with steam in binary vapour cycle because it

hasa.higher critical temp and pressure b.higher saturation temp than

other fluidsc.relatively low vaporasition pressure d. all above30) Binary vapour cycles are used toa.increases the performance of the condenser b.increases the

efficiency of the plantc. increases efficiency of the turbine

31) A steam power station requires space ]a.equal to diesel power station b. more than diesel power stationc.less than diesel power station

32) Economise is used to heata.air b.feed water c.flue gases d.all above

33.) The modern steam turbine area.impulse turbine b.reaction turbinec. impulse-reaction turbine d.none of the above

34) The draught which a chimney produceds is calleda .induced draught b. natural draughtc.forced draught d. balanced draught35) the draught produced by steel chimney as compared to that

produced by brick chimney for the same height isa.less b. more c. same d. may be more or less

36) In boiler installation the natural draught is produceda.due to the fact that furnance gases being light go through the chimney

giving place to cold air from outside to rush inb.due to the fact that pressuere at the grate due to cold column is

higher than the pressure at chimney base due to hot columnc.due to the fact that at the chimney top the pressure is more than its

environmental pressure d.all of the above37) The draught produced , for a given height of the chimney and given

mean temperature of chimney gasesa.decreases with increase in outside air temp b.increases with increase

in outside air tempc.remains the same errespective of outside air temp d.may increase or

decreasewith increase in outside air temp38) the draught produced by chimney of given height at given outsidetemp

a.decreases if the chimney gas temp increases b. increases if thechimney gas temp increases

c.remains same irrespective of chimney gas temp d. may increase ordecrease39) For forced draught systems ,the function of chimney is mainly 'a. To produce draught to acclerate the combustion of fuel b. to

discharge gases high up in the atmosphere to avoid hazardc. to ruduce the temp of the hot gases discharged d. none of the

above40) Artificial draught is produced bya.induceed fan b.forced fan c. induceed and forced fan d.all of the

above


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41) The draught in locomotive boilers in produced bya. forced fan b.chimney c.steam jet d. only motion of locomotive42) For the same draught produced the power of induceed draught fan

as compared to forced draught fan isa. less b. more c. same d. not predictabel43) Artificial draught is produced bya. air fans b. steam jet c.fan or steam jet d. all of the above44) the artificial draught normally is designed to producea. less smoke b. more draught c. less chimney gas temp d. all of the

above45) For the induceed draught the fan is locateda.near bottom of chimney b.near bottom of furnace c.at the top of the

chimney d. anywhere permissible46) The pressure at the furnance is minimum in case ofa. forced draught system b. induceed draught ststem c.balanced

draught ststem d. natural draught system47) For maximum discharge of hot gases through the chimney the

height of hot gas column producing draught isa. twice the height of chimney b. equal to the height of chimney c. half

the height of chimney d. none of the above

48) the efficiency of chimney is approximatelya.80% b.40% c.20% d.0.25%49) In balanced draught system the pressure at force fan inlet 'a.is greater than pressure at chimney outlet b. is less than pressure at

chimney outletc.approximately same as that at chimney outlet50) For a steam nozzle , if P1= inlet pressure ,P2=exit pressure and n

is the index of isentropic expansion , the mass flow rate perunit rate per unit area is maximun if

a.P2/P1


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c.no change in exit velocity from nozzle d. increase or decreasedepending upon the exit quality of steam

57) The effect of considering friction in steam nozzles for the samepressure ratio leads to

a.increase in dryness fraction of exit steam b. decrease in drynessfraction of exit steam

c. no change in the quality of exit steam d. may decrease or increaseof dry ness fraction of exit steam depending upon inlet quality

58) In case of impulse steam turbinea. these is enthalpy drop in fixed and moving blades b.there is

enthalphy drop only in moving bladesc. there is enthalphy drop in nozzles d. none of the above59) De Laval turbine isa. pressure compounded impulse turbine b. velocity compounded

impulse turbinec.simple single wheel impluse turbine d. simple single wheel reaction

turbine60) The pressure on the two sides of the impulse wheel of a steam

turbinea. is same b. is different c. increases from one side to the order side

d. decreases from one side to the other side61) In De leval steam turbinea. the pressure in the turbine rotor is approximately same as in

condenserb. the pressure in the turbine rotor is higher than pressure in the

condenserc. the pressure in the turbine rotor gradually decreases from inlet to exit

to condenserd. none of the above62) In case of reaction steam turbinea. there is enthalpy drop both in fixed and moving blades b. there is

only enthalphy drop only in the fixed bladesc. there is enthalpy drop only in moving blades d. none of above

63) Curtis turbine isa. reaction steam turbine b. pressure-velocity compounded steam

turbinec.presure compounded impulse steam turbine d. velocity compounded

impulse steam turbine64) Reteau steam turbine isa. reaction steam turbine b. velocity compounded impulse steam turbinec.pressure compounded impulse steam turbine d. pressure velocity

compounded steam turbine65) Parson's turbine isa. pressure compounded steam turbine b. simple single wheel ,

impulse steam turbinec.simple single wheel reaction steam turbine d. multi-wheel reaction

steam turbine71) For Parson's reaction as reffered to steam turbine , degree ofreaction is

a.75% b.100% c.50% d.60%73) Reheat factor in steam turbines depends ona. exit pressure only b.stage efficiency only c.initial pressure and temp

onlyd.all of the above74) For multistage steam turbine ,reheat factor is defined asa.stage efficiency *nozzle efficiency b.stage efficiency '


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c.cumulative enthalpy drop/isentropic enthalpy dropd.isentropic enthapy drop /isentropic enthalpy drop

75) the value of reheat factor normally varies froma. 0.5to 0.6 b. 0.9to0.95 c. 1.02 to 1.06 d. 1.2to 1.6

76) Steam turbines are governed by which of the following methods ?a.Throttle governing b. Nozzle control governingc.By pass governing d. All of the above

77) In steam turbine the reheat factora. increases with the increase in number of stages b. decreases with

the increase in number of stagesc.remains same irrespective of number of stages d. none of the above

78) The thermal efficiency of the engine with condenser as compared towith out condenser , for a given pressure

temp of steam isa.higher b.lower c.same as long as intial pressure and temperature is

unchangedd. none of the above

79) In jet type condensersa.cooling water passes through tubes and steam surrounds themb.steam passes through tubes and cooling water surrounds them

c.steam and cooling water mix d.steam and cooling water donot mix80) In a shell and tube surface condensera. steam and cooling water mix to give the condensateb.cooling water passes through the tubes and steam surrounds themc. steam passes through the cooling tubes and cooling water surrounds

themd.all of the above varying with situation

81) In a surface condenser if air is removed , there isa. fall in absolute pressure maintened in condenser b.rise in absolute

pressure maintened in condenserc.no change in absolute pressure in the condenser d. rise in temp of

condensed steam82) The cooling section in the surface condenser

a. increases the quantity of vapour extraceted along with airb. reduces the quantity of vapour extracted along with airc.does not affect vapour quantity extracted but reduces pump capicity of

air extraction pumpd. none of the above

83) Edward's air pumpa.removes air and also vapour from condenser b. removes only air

from condenserc.removes only un-condensed vapour from condenserd. removes air alongwith vapour and also the condensed water from

condenser84) Vaccum efficinecy of a condenser is ratio ofa .actual vaccum in condenser with air present /theoretical vaccum in

condenser with no air presentb. theoritical vaccum in condenser with no air present / actual vaccum incondenser with air present

c(.parital pressure of vapour +partial pressure of air present )/partialpressure of vapour only

d.partial pressureof vapour only /partial pressure of vapour +partialpressure of air pressure85) In a steam power plant the function of a condenser isa.to maintain pressure below atmosphere to increase work output from

the prime mover


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b.to receive large volumes of steam exhausted from steam prime moverc.to condense large volumes of steam to water which may be used

again in boilerd. all of the above ]

86.) In a regerative surface condensera.there is one pump to remove air and condensate b.there are two

pumps to remove air and condensatec.there are three pumps to remove air , vapour and condensated. there is no pump , the condensate gets removed by gravity

87) Evaporative type of condenser hasa.steam in pipes surrounding by water b. water in pipes surrounded by

steamc.either (a)and (b) d.none of the above88) Condenser efficiency is defined asa.saturation temp at condenser pressure/rise in cooling water tempb.temp rise of cooling water/saturation temp corrosponding to

condenser pressurec.temperature rise of cooling water /saturation temperature

corrosponding to condenser pressure -- cooling water inlet temperatured. saturation temperature corrospondingto condenser

pressure/saturation temperature of vapour at its partial pressure incondenser89) Pipes carrying steam are generally made up ofa, steel b.cast iron c.copper d.aluminium90) For the safety of a steam boiler the number of safety valves fitted

area. four b.three. c.two d.one91) Steam turbines commonly used in steam power station area.condensing type b.non-condensing typec.none of the above

92) Belt conveyer can be used to transport coal at inclinationupto----------- degree

a.30 b.60 c. 80 d .90

93) The maximum length of a screw conveyor is abouta.30 metres b.40 metres c.60 metres d.100 metres94) The efficiency of a modern boiler using coal and heat recovery

equipment is abouta.25to 30% b.40 to50% c. 65to 70% d.85 to 90%95) The average ash content in Indian coals is abouta.5% b.10% c.15% d. 20%

96) Load centre in a power station isa.centre of coal fields b.centre of maximum load of equipmentc.centre of gravity of electrical system

97) Steam pressure in a steam power station , which is usually keptnow-a-days is of the order of

a, 20 kgf/cm^2 b.50 kgf/cm^2 c.100kgf/cm^2 d . 150 kgf/cm^2

98) Economisers improve bioler efficiency bya.1 to5% b. 4to 10% c. 10 to 12% d. 15 to 21%99) In steam power station , the choice of high temperature steam is fora.increasing the efficiency of the boiler alone b.increasing the efficiency

of turbine alonec.increasing overall efficiency d. none of the above

100) Location of centre of gravity (c.g) of any electrical distributionsystem is determined as

a.c.g= total load(electrical )/sum of moments about two axesb. c.g = sum of moments about two axes/total loading


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c.c.g = sum of moments * total loading d. c.g = sumof moments *(totlaloading )^2101) Capicity of turbine and genrator are related as

a. Turbine kw =generator kw/generator efficiency b. Turbine kw=generator kw * generator efficiency

c.Turbine kw= generator kw d. Turbine kw = (generator kw)^2102) The capacity of large turbo generator varies froma.20 to 100 mw .b. 50 to 300 mwc.70 to 400 mw d. 100 to 650mw103) Caking coals are those whicha.burn completly b. burn freely c.do not form ash d. form lumps or

masses of coke104) Primary air is the air which is used toa. reduce the flame length b. increase the flame length c.transport

and dry the coald. provide air around burners for getting optimum combustion

105) Secondary air is the air used toa. reduce the flame length b. increase the flame lengthc.transport and dry the coal d. provide air round burners for getting

optimum combustion

106) Presence of sulphur in coal will result ina. corroding air heaters b.spontaneous combustion during coal storagec.causing clinkering and slagging d. all of the above

107) Pulverised fuel is used fora. saving fuel b. better burning c.obtainging more heat

108) Combustible elements in the fuel area. carbon and hydrogen b. carbon , hydrogen and suplhur c. carbon

,hydrogen and nitrogend. carbon , hydrogen and ash

109) Heating value of diesel oil is abouta.5000 kcal/kg b. 7000 kcaL/kg c. 9000kcal/kg d. 11000kcal/kg

110) Highe calorific value (h.c.v) is the heating value of fuela. with out water vapour which are formed by combustion

b. wth water vapour which are formed by combustion c.none of theabove111) Which one is essential for combustion of fuel ?a. oxygen to support combustion b. correct fuel air ratio c. proper

ignition tempd. all the three above112) Ultimate analysis of fuel is determination of percentage ofa.total carbon by weight b. total carbon by weight unit of H2 ,O2 ,N2 ,

sulphur and ashc .ash ,volatile matter and moisture113) Which of the following coals has the highest calorific value?a.Peat b. Lignite c. Bituminous d. Anthracite coal

114) The proximate analysis of coal give

a. various chemical constituents ,carbon ,hydrogen , oxygen ,and ashb. fuel constituent as percentage by weight , of moisture ,volatile , fixedcarbon and ash

c.percentage by weight ,of moisture ,volatile matter ,fixed carbon andash115) In coal preperation plant , magnetic separators are used to removea.dust b. clinkers c.iron particles d. sand116) Load carrying capacity of belt conveyor is abouta. 20 to 40 tons/hr b. 50 to 100tons/hr c. 100to 150 tons/hr d. 150 to

200 tons/hr


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117) Method which is commonly applied for unloading the coal for smallpower plant is

a. lift trucks b. coal acclerators c.tower cranes d.belt conveyor118) Bucket elevators are used fora.carrying coal in horizontal dirction b. carring coal in vertical direction

c.carrying coal in any direction119) The amount of air which is supplied for complet combustion iscalleda.primary air b.secondary air c.tertiary air120)In ---------- system fuel from a central pulverizing unit is delivered to

a burner and then to the various burnersa.unit b. central c.none of the above

121) Underfeed stokers work best for ------- coals high in voaltile matterand with caking tendency

a.anthracite b. lignite c.semi-bituminous and bituminous122) Example of overfeed type stoker isa.chain grate b.spreader c.travelling grate d.all of the above

123) Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used isa. underfeed stoker b. overfeed stoker c.any

124) Travelling grate stokers can burn coals at the rates ofa. 50to 75 kgper m^2per hour b. 75to 100kg/m^2 .hr c. 100to

150kg/m^2.hr d. 150to 200 kg/m^2.hr125) Capacity of the undrfeed stoker is of the order of

a.100to 200 kg of coal burned per hour b. 100 to 500 kg of coal burnedper hour

c,100 to 2000kg of coal burned per hour d. 100 to 4000 kg of coalburned per hour126) Economisers are usually used in boiler plant working abovea. 30 kgf /cm^2 b. 50 kgf /cm^2 c. 70kgf/cm^2 d.90 kgf/cm^2

127) Superheating of steam is desirable fora.increasing the efficiency of Rankine cycle b.reducing initial

condensation losses

c.avoiding too high moisture in the last stage of turbine d. all of theabove128) Thermal efficiency of the steam plant is of the order ofa.30% b.50% c.60% d.80%129) In a regenerative air prheater , the heat is transfereda. by direct mixing b. by extracting some gas from the furnancec.from heating an intermediate material and then heating the air from

this material130) The height of chimney in a steam power plant is governed by

a.flue gases quantity b. the draught to be produced c. control ofpollution131) In boilers the feed water treatment is done mainly for removing

-----troubles

a. corrosion b. scale formation c.carry over d. embrittlement d.all of theabove132) Blowing down of boiler water is the process toa.reduce the boiler pressure b. increase the steam temperaturec.control the solid concentration in the boiler water by removing some of

the concentrated saline water133) 'Deaerative heating is done to

a. heat the water b. heat the air in the water c.remove dissolvedgases in the water134) Reheat factor is the ratio of


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a. isentropic heat drop to useful heat drop b. adiabatic heat drop toisentropicheat drop

c.cumulative actual enthalpy drop for all stages to total esentropicenthalpy heat drop.135) The value of the reheat factor is of the order of 'a.0.8 to 1.0 b.1.0 to1.05 c. 1.1 to 1.5 d. above 1.5

136) compounding of steam turbine is done fora.reducing the work done b. encreasing the rotor speed c.reducing

the rotor speed d. balancing the turbine137) Topping turbines are

a. low pressure condensing units b. high pressure non- condensingunits c.low pressure non condensing units

d.high pressure condensing units138) In thrittling goveringa.larger heat drop is available b.lesser heat drop a available c.there no

effect on heat drop139) The commonly used material of condenser tubes isa.aluminium b .cast iron c.admiralty brass d.mild steel

140) The blades of impulse turbine area.symmetrical shaped around the centre line b.asymmetrically shaped

around the centre linec.none of the above

141) For medium and large size turbine the --------- governing is useda. throttle b. nozzle control c.by pass d. combination of a, b ,c

142) Fuction of air pump in condenser is toa.remove water b.maintain c.maintain atmosperic pressure

143) Wet air pump removesa.air only b.only condensate c.both air and condensate

144) In diesel cyclea.compression ratio and expansion ratio are equal b.compression ratio

is greater than expansion ratio.c.compression ratio is less than expansion ratio d.compression ratio =

(expansion ratio)^2

145) Compression ratio of an I.C engine is the ratio ofa.total volume/swept volume b.total volume/clearance volume c.either

of the above d.none of the above146) In diesel engine the heat lost to the cooling water is

a.10% b.20% c.30% d.70%147) The mechanical efficiency of diesel engine is defiened as

a.B.H.P/I.H.P b. I.H.P/B.H.P c. B.H.P*I.H.P d.(B.H.P)^2/I.H.P148) The temp of cooling water leaving the diesel engine should not bemore than

a.30 c .b.40c c.60c d.80c149) Total cost of a diesel power plant per kw of installed capacity is

less than that of steam power plant bya. 5to 10% b. 20 to30% c. 40 to 50% d. 70 to 80%

150) The ratio of piston stroke to bore of cylinder for internalcombustion engine varies betweena.0.9 to 1.9 b. 0.5 to 0.8 c.0.3 to 0.6 d. 0.1 to0.2

151) Air fuel ratio requiredfor combustion of diesel engine is abouta. 5:1 b. 10:1 c. 15:1 d. none of the above152) In multicylinder engines a particular sequence in the firing order is

necessarya.to provide the best engine performance b.to obtain uniform turning

momentc.to operate the ignition system smoothly d. to obtain non-uniform


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turning moment153) Most high speed diesel engines work ona.Diesel cycle b.Carnot cycle c. Dual combustion cycle d. Otto cycle154) In case of diesel engine , the pressure at the end of compression is

in the range ofa. 7to 8 kgf/cm^2 b. 20 to 25kgf/cm^2 c. 35 to40 kgf/cm^2 d. 50 to 60

kgf/cm^2155) Reciprocating motion of the piston is converted into a rotary one by

a.connecting rod b.crank shaft c.crank web d.gudgeon pin156) Maximum temperature which is developed in the cylinder of a

diesel engine is of the order ofa.1000to 1500c b.1500 to 2000c c. 2000 to 2500 c d. 2500 to 3000c

157) Infour stroke cycle engine , the four operation namely suction,compression ,expansion and

exhaust are completed in the number of revolution of crank shaft equalto

a.four b. three c.two d. one158) In a two stroke cycle engine ,the operation namely suction

,comprssion ,expansion and exhaust are completed in the numberof revolution of crank shaft equal to

a. four b. three c.two d.one ]159) In a four stroke cycle S.I engine the cam shaft runsa.at the same speed as crank shaft b. at half the speed of crank shaftc.at twice the speed of crank shaft d.at any speed irrespective of

crank shaft speed160) The following is an S.I enginea .Diesel engine b.petrol engine c.Gas engine d. None of the above

161) The following is C.I enginea.Diesel engine b.Petrol engine c.Gas engine d.None of the above

162) In a four stroke cycle petrol engine ,during suction strokea.only air is sucked in b.only petrol is sucked in c.mixture of fuel and

air is sucked in d.none of the above163) In a four stroke cycle diesel engine , during suction stroke

a.Only air is sucked in b.only fuel is sucked in c.mixture of fuel and airis sucked in

d.none of the above164) The two stroke cycle engine hasa.one suction valve and one exhaust valve operated by one canb.one suction vavle and one exhaust vavle operated by two camsc.only ports covered and uncovered by piston to effect charging and

exhaustingd. none of the above

165) For same output ,same speed and same compression ratio thethermal efficiency of a two stroke cycle petrol engine as compared to thatfor

four stroke cycle petrol engine

a.more b. less c.same as long as compression ratio is same d.sameas long as output is same166) The ratio of brake power to indicated power of an I.c engine is

calleda. Mechanical efficiency b.thermal efficiency c.volumetric efficiency d.

relative efficiency167) The specific fuel consumption of a diesel engine as compared to

that for petrol engine isa.lower b.higher c.same for same output d.none of the above

168) The thermal efficiency of petrol engine as compared to diesel


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engine isa. lower b.higher c.same for same power oupput d.same for same

speed169) Compression ratio of petrol engines is in the range ofa.2to3 b. 7to10 c. 16 to 20 d.none of the above

170) Compression ratio of diesel engine may have a rangea.8to 10 b.10 to 15 c. 16 to 20 d. none of the above

171) The thermal efficiency of good I.c engine at the rated loadis in therange

a. 80 to90% b.60 to 70% c. 30 to 35% d.10 to 20%172) In case of S. I engine , to have best thermal efficiency the fuel airmixture ratio should be

a.lean b.rich c.may be lean or rich d.chemically correct173) The fuel-air ratio , for maximum power of s.i engine , should bea.lean b.rich c. may be lean or rich d.chemically correct

174) In caseof petrol engine ,at startinga.rich fuel-air ratio is needed b.weak furl air ratio is neededc.chemically correct fuel-air ratio is needed d. any fuel-air ratio will do

175) Carburettor is used fora.S.I engine b.gasengines c.C.I engine d.none of the above

176) Fuel injector is used ina.S.I engine b.gas engine c. C.I engine d. none of the above

177) Very high speed engines are generallya.gas engines b.S.I engines c.C.I engines d. steam engines

178) In s.i engine , to develope high voltage for spark pluga.battery is installed b.distributor is installedc.carturettor is installed d. ignition coil is installed

179) In s.i engine , to obtain required firing ordera.battery is installed b.distrubutort is installedc.carburettor is installed d. ignition coil is installed

180) For petrol engines the method of governing employed isa.quantity governing b. quality governing c.hit and mis governingd. none of the above

181) For diesel engines the method of governing employed isa.quantity governing b.quality governingc.hit and miss governing d.none of the above

182) Voltage developed to strike spark in thespark plug is in the rangea.6 to 12 volts b. 1000to 2000 volts c. 20000to 25000voltsd.none of the above

183) In a four cylinder petrol engine the standard firing order isa.1-2-3-4 b.1-4-3-2 c.1-3--2-4 d. 1-3-4-2

184) The torque developed by the engine is maximuma. at minimum speed of engine b.at maximum speed of enginec.at maximum volumetric efficiency speed of engine d. at maximum

power speed of engine185) Iso-octane content in a fuel for S.I engines

a.retards auto ignition b.acclerates autoignitionc.does not affect autoignition d.none of the above186) Normal heptane content in fuel for S.I enginesa.redards autoignition b.acclerates auto ignitionc. does not affect auto ignition d. none of the above

187) The knocking in S.I engine increases witha.increases in inlet air temperature b.increase in compression ratioc.increase in cooling water temperature d. all of the above188) The knocking in S.I engines gets reduceda.by increasing the compression ratio b.by retarding the spark


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advancec.by increasing inlet air temperature d. by increasing the cooling water

temperature189) Increasing the compression ratio is S.I enginea.increasing the tendency for knocking b.decrease tendency for

knockingc. does not affect knocking d. none of the above190) The knocking tendency in petrol engines will increase whena.speed is decreased b.speed is increasedc.fuel-air ratio is made rich d.fuel-air ratio is made lean191) The ignition quality of fuel for s.i engines is determined bya.cetane number rating b.octane number ratingc.calorific value rating d.volatility of the fuel

192) Petrol commerically availlable in india for indian passenger cars hasoctane number in the

rangea.40 to 50 b. 60 to70 c.80 to 85 d. 95to 100

193) Octane number of the fuel used commerically for diesel engine inIndia

is in the range

a.80 to 90 b.60 to 80 c. 60 to70 d. 40 to 45194) The knocking tendency in C.I engine increases witha. decreases of compresion ratio b.increase of compressionc.increasing the temperature of inlet air d. increasing cooling water

temperature195) If the petrol is used in a diesel engine ,thena.low power will be produced b.efficiency will be lowc.black smoke will be produced d.higher knocking will occur

196) Thermal efficiency of a gas turbine plant as compared to dieselengine plant is

a.higher b.lower c.same d. may be higher or lower197) Mechanical efficiency of a gas turbine as compared to internal

combustion reciprocating

engine isa. higher b.lower c.same d. un-predictable198) for a gas turbine the pressure ratio maybe in the range

a. 2 to3 b. 3 to 5 c. 16 to 18 d. 18 to22200) A closed cycle gas turbine works on

a.Carnot cycle b.Rankine cycle c. Joule cycle d.Atkinson cycle201) Thermal efficiency of closed cycle gas turbine plant increases by 'a.reheating b.intercooling c.regenerator d.all of the above

202) With the increase in pressure ratio thermal efficiency of a simplegas turbine plant with

fixed turbine inlet temperaturea.decreases b.increases c.first increases and then decreases d.first

decreases and then increases

203) The thermal efficiency of a gas turbine cycle with ideal regenerativeheat exchanger isa.equal to work ratio b.less than work ratio c.more than work ratio

d.unpredictable204) In a two stage gas turbine plant reheating after first stagea.decreases work ratio b.decreases work ratioc.does not affect work ratio d.none of the above

205) In a two stagegas turbine plant , with intercooling and reheatinga.increases work ratio b.decreases work ratioc.does not affect work ratio d.none of the above


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206) In a two stage gas turbine plant , with interdcooling and reheatinga. both work ratio and thermal efficiency emproveb.work ratio improves but thermal efficiency decreasesc.thermal efficiency improves but work ratio decreasesd.both work ratio and thermal efficiency decreases

207) For jet propulsion unit, ideally the compressor work and turbine area.equal b.unequal c.not related to each other d.unpredictable208) Greater the difference between jet velocity and aeroplane velocitya. greater the propulsive efficiency b.less the propulsive efficiencyc.unaffected is the propulsive efficiency d. none of the above

209) For starting gas turbine, the turbine rotor is usually motoredupto'coming in '

speed which is equal toa.rated speed of the gas turbine b.half of the rated speed of the gas

turbinec.no relation with speed of the turbine

210) The blades of the gas turbine rotor are made ofa.carbon steel b.stainless steel c.high alloy steel d.high nickle alloy211) Maximum temperature in a gas turbine is of the order ofa.700 c b. 900 c c. 1600 c d. 2100 c

212) In gas turbines , high thermal efficiency is obtained ina.closed cycle b.open cycle c.in both the cycle213) In a gas turbine plant ,a regenerator increases ]a.work output b.pressur ratio c.thermal efficiency d. none of the

above214) Maximum combustion pressure in a gas turbine is --------- as

compared to diesel enginea.same b. less c. more215) Capital cost of a gas turbine plant is ---------- than that of asteam

power plant of same capacitya.same b. lower c.higher216) Peltron turbines are mostly 'a. horizontal b.vertical c. inclined

217) The annual depreciation of a hydrodpower plant is abouta.0.5 to 1.5% b.10 to15% c. 15 to 20% d. 20 to25%218) The power output from a hydro-electric power plants depends on

three parametersa.head ,type of dam and discharge b.head,discharge and efficiency of

systemc.efficiency of the system, type of draft tube and type of turbine usedd.type of dam ,discharge and type of catchment area.219) Water hammer is developed ina. penstock b.draft tube c.turbine d.surge tank220) The function of a surge tank is '

a.to supply water at constant pressureb.to produce surges in the pipe line c.to relive water hammer pressure

in the penstock pipe221) Gross head of a hydropower station isa. the difference of water level between the level in the storage and tailrace

b.the height of the water level in the river where the storage is providedc.the height of the water level in the river where tail race is provided

222) Operating charges are minimum in the case of -------- for samepower output

a.gas turbine plant b.hydel plant c.thermal plant d.nuclear plant223) Location of the surge tank in a hydroelectric station is near to the


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a.tailrace b.turbine c.reservoir224) Pelton wheel turbine is used for minimum of the following headsa.40m b.120m c. 180m above

225) Running cost of a hydro-electric power plant isa.equal to running cost of steam power plant b.less than running cost

of a steam power plantc.more than running cost of asteam power plant

226) The empirical relation for determination of number of buckets (Z)for peltron turbine in terms

of jet ratio (m) is given bya.Z= 15m+ 0.5 b. Z=0.5m+15 c. Z= (m/0.5)+ 15227) Francis turbine is uaually used fora.high heads b. mediun heads c. low heads

228) In high head hydro-power plant the velocity of water is pen stock isabout

a.1m/s b.4 m/s c. 7 m/s d . 12 m/s229) Peltron turbine is suitable for hgh head anda.high discharge b.low discharge c.both low and high discharge

230) in reaction turbine ,function of the draft tube isa.to increase the flow rate b.to reduce water hammer effect

c.to convert kinetic energy of water to potential energy by a gradualexpansion in divergent part

231) Francis turbine is usually used fora.low head installation upto 30m b.medium head installation from 30

to180mc.high head installation above 180m d.forall heads232) In francis turbine runner , the number of blades is generally of the

order ofa. 1-2 .b.4-6 c.6-8 d. 12-16233) Francis ,Kaplan and propeller turbines fall under the category of

a.impulse turbine b.reaction turbine c.impulse reaction combined d.axial flow

236) The average thermal efficiency of a modern nuclear power plant is

abouta.30% b. 40% c.60% d . 80%237) Reflectors of a nuclear reactor are made up ofa.boron b.cast iron c.beryllium d.steel238) The function of a moderator in a nuclear reactor isa.to slow down the fast moving electrons b.to speed up the slow

moving electronsc.to start the chain reaction d. to transfer heat produced inside the

reactor to a heat exchanger239) When a nuclear reactor is operating at constant power the

multiplication factor isa.less than unity b.greater than unity c.equal to unity d. none of the

above

240) The conversion ratio of a breeder reactor isa.equal to unity b.more than unity c. less than unity d.none of theabove

241) In the nuclear fission reactions---------- isotope of uranium is useda.U^233 b.U^ 234 c. U^238

242) Tarapur nuclear power plant hasa.pressurised water reactor b.boiling water reactorsc.CANDU type reactors243) Critical mass of fuel is the amount required to make the

multiplication factor --------- unity


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a. equal to b.less than c.more than244) the nuclear energy is measured asa.MeV b.MW c.Curie245) fission chain reaction is possible whena.fission produces the same number of neutrons which are absorbedb.fission produces more neutrons than are absorbedc. fission produces less neutrons than are absorbed d.none of the

above246) In nuclear chain fission reaction , each neutron which causes

fission producesa.no new neutron b.one new neutron c.more than one new neutron247) --------- is the most commonly used moderatora.Graphite b.Sodium c.Derterium d.Any of the above

248) Which of the following are fertile materialsa.U^238 and Th^239 b.u^238 and Th^232 c. U^233 and Pu^239 d.

U^238 and Pu^ 239249) In a nuclear reactor the function of a reflector is to f

a.reduce the speed of the following b.stop the chain reactionc.reflect the escaping neutrons back into the core

250) In gas cooled reactor (GCR)-------- are used as moderator an

coolant respectlya.heavy water and CO2 b.graphite and air c. graphite and CO2 d.

none of the above251) In a pressurised water reactor (PWR)a.the coolant water is pressurised to work as moderator b.the coolant

water boils in the core of the reactorc.the coolant water is pressurised to prevent boiling of water in the cored.no moderator is used252) The function of the moderator in a nuclear reactor is toa. stop chain reaction b.absorb neutrons c.reduce the speed of

neutronsd.reduce temperature253) Thermal shielding is provided to

a.protect the walls of the reactor from radiation damageb.absorb the fast neutronsc.protect the operating personnel fromexposure to radiationd.a,b,c,above e.b,cboth f.none of the above

254) A CANDU reactor usesa.only fertile material b. highly enriched uranium(85%U^235).c.natural uranium as fuel and heavy water as moderator and coolant

255) Fission of U^235 releases -------- energya.200 MeV b. 238 MeV c. 431 MeV

256) Fast breed reactors are best suited for India becausea.of large throium deposits b.Tarapur (Bombay) c.Kota (Rajasthan)

d.Kalpakkam (Madras)258) load factors of a power station is defined as

a.maximum demand/average load b.average load*maximum loadc.average load /maximum demand d.none of the above259) Load factor of a power station is generallya.equal to unity b.less than unity c.more than unity d.more than

twenty260) Diveresity factor is alwaysa equal to unity b.less than unity c.more than unity d.more than twenty

261) The load factor for heavy industries may be taken asa.10 to 20% b.25 to 40% c. 50 to 70% d. 70 to 80%

262) The load factor of domestic load is usually


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a.10 to 15% b.30 to40% c.50 to 60% d. 60 to 70%263) Annual depriciation cost is calcualted bya.sinking fund method b.straight line method c.both aand b

d.estimate value264) Depreciation charges are high in case ofa.thermal plant b.diesel plant c.hydro-electric plant d. any of the

above265) Demand factor is defined asa.average load/maximum demand b.maximum demand /connected

loadc.connected load /maximum demand d.maximum demand * connected

load266) High load factor indicates thata.cost of generation per unit power is increased b.total plant capacity

is utilised for most of the timec.total plant capacity is not properly utilised for most of the time

267) A load curve indicatesa.average power used during the period b.average Kwh(kw) energy

consumption during the periodc.neither a nor b.

268) Approximate estimation of power demand can be made by themethod /methods

a.load survey method b.statistical methods c.mathematical methodd.economic parameters e.all of the above269) Annual depreciation as per straight line method ,is calculated by

a.the capital cost divided by number of years of life b.the capatial costminus the salvage value , is divided by the number of years of life

c.investing a uniform sum of money per annum at stipualted rate ofinterest

270) A consumer has to pay lesser fixed charges ina.flat rate tariff b.two part tariff c.maximum demand tariff271) In a two part tariff, variation in load factor will affecta.fixed charges b.operating or running charges c.both a and b

272) In india the tariff for charging the consumers for the consumption ofelectiricity is based on

a.straight meter rate b.block meter rate c. reverse form of block meterrate d.two part tariff273) In Hopkinson demand rate or two part tariff the demand rate or

fixed charges area.dependent upon the energy consumed b.dependent upon the

maximum demand of the consumerc.both a and b d.none of the above

274) The function of a solar collector is to converta.solar energy into electricity b.solar energy into radiation c.solar

energy into thermal energy275) Most of the solar radiation received on earth surface lies with in the

range ofa.0.2 to 0.4 microns b. 0.38 to 0.78 microns c.0 to 0.38 microns276) Flat plate collector absorbsa.direct radiation only b.diffuse radiation only c.direct and diffuse both277) Main applications of solar energy may be considered in the

following categoriesa.solar electric application b.fuel from biomassc.derect thermal applications d.both a and b e. a, b and c.

278) Temperatrure attained by a flat- plate collector is of thea.order of about 90 c b.range of 100c to 150c c.above 150c d. none


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of the above279) A pyranometer is used for measurement of

a.direct radiation only b.diffuse radiation only c.direct as well as diffuseradiation280) Sun tracking is needed in the case of ---------collectora.flat plate b.cylinderical parabolic and paraboloid c. both a and b

281) In a solar collector the function of the transparentcover is toa.transmit solar radiation only b.protect the collector from dust

c.decrease the heat loss from collector beneath to atmosphere282) Temperature attained by cylinderical parabolic collector is of therange

a.50 to 100c b.100 to 150c c.150 to 300 d. 300 to 500c283) Most widely used materialof a solar cell is

a.arsenic b.cadmium c.silicon d. steel284) Photovoltaic cell or solar cell converts

a. thermal energy into electricity b.electromagnetic radiation derectlyinto electricity

c.solar radiation into thermal energy285) Maximum wind energy available is proportional toa square of the diameter of rotor b.air density c.cube of the wind

velocity d.a ,b and c.286) --------- type of wind mill is of simple designa.Horizontal axis wind mill b.Vertical axis wind mill c.None

287) Cost of wind energy generator compared to conventional powerplants for the same power output is

a.equal b.lower c.higher288) The turbine whichis used in a tidal power plant for getting

continuous power isa.simple impulse type b.reversible type c.propeller type289) Largest geothermal plant on operation is ina.Maxico b.Italy c.Russia d.California

290) Geothermal plant is suitable fora.base load power b.peak load power c.none

291) A geithermal field may yielda.hot water b.wet steam c.dry steam d. a, b and c.

292) Geothermal power plants as compared to fossil fuel plants have-------- load factor

a. equal b. lower c. higher293) Geothermal steam and hot water may containa.NH3 b.Na2s c.H2S, NH3 and radon gas

294) Fuel cells have conversion efficiencies of the order ofa.20% b.30% c.50% d.70%

295) Fuel cell is device in whicha.chemical energy is converted into electricityb.heat energy is first converted into chemical energyc.heat energy is converted into electriciy

296) The nature of the current developed by MHD generator isa.direct current b.alternating current c.either direct or alternating297) In MHD generator the conductor employed is

a.gas b.liquid metal c.liquid metal or gas d.none of the above298) Seeding meterial which is added with the working fluid in MHDgenerator is used fora.decreasing the conductivity of the gas b.increasing the conductivity of

the gasc.creating no effect on conductivity

299) Power output per unit volume of an MHD generator is proportional


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toa.square of the magnetic flux density b.electrical conductivity of the

gasc.square of the fluid velocity d. a , b.and c

300) Biogas consists ofa. only methane b.methane and co2 with some impuritiesc.a special organic gas d.none of the above

301) The main by product of the biogas plant isa.biogas b.bio-mass c.organicmanure

302) Thermo-electric energy conversion is dur toa.radiation b.emission effect c.thermal energy

303) The working principle of thermo- electric generator is based on theprinciple of

a. hall b.seebeck c.Faraday304) Materials which are employed for electrodes in thermo- electric

generators are ofa. insulators b.semiconductors c.metals d.conductor

305) Thermionic converter utilizesa. Thermionic emission effect b.Pettier effect c.Seebeckeffect

ANSWERS

1.a 2.a 3.a 4.a 5.c 6.b 7.a 8.a 9.d 10.a 11.b 12.d 13.c 14.c15.a 16.d 17.b 18.a 19.b 20.b21.b 22.b 23.a 24. b 25.b 26. a 27.c 28.b 29. d 30.b 31.b 32.b

33.c 34.b 35.b 36.b 37a 38.b39.b 40.d 41.c 42.b 43.d 44.d 45.a 46.c 47.b 48.d 49.c 50.d 51.a52.b 53.c 54.d 55.d 56.b 57.a58.c 59.c 60.a 61.a 62.a 63.b 64.c 65.d 66.b 67.a 68.c 69.c 70.c71.c 72.c 73.d 74.c 75.c 76.d77.a 78.a 79.c 80.b 81.a 82.b 83.d 84.a 85.d 86.b 87.a 88.c 89.a90.c 91.a 92.a 93.a 94.d 95.d

96.c 97.d 98.b 99.c 100.b 101.a 102.b 103.d 104.c 105.d 106.e107.b 108.b 109.d 110.b 111.d 112.b113.d 114.c 115.c


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