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1) Which of the following is not an interns combustion engine___________________? a. 2-stroke petrol engine b. 4-stroke petrol engine c. diesel engine d. gas turbine e. steam turbine
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2) The output of a diesel engine can be increased without increasing the engine revolution or size in following way_________________? a. feeding more fuel b. increasing flywheel size c. heating incoming air d. scavenging e. supercharging
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3) In a typical medium speed 4-stroke cycle diesel engine________________? a. compression starts at 35° after bottom dead center and ends at top dead center b. compression starts at bottom dead center and ends at top dead center c. compression starts at 10° before bottom dead center and, ends just before top dead center d. may start and end anywhere e. none of the above
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4) The precess of breaking up or a lipuid into fine droplets by spraying is called___________________? a. vaporisation b. carburetion c. ionisation d. injection e. atomisation
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5) The accunmulation of carbon in a cylinder results in increase of________________? a. clearance volume b. volumetric efficiency c. ignition time d. effective compression ratio e. valve travel time
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6) The air-fuel ratio of the petrol engine is controlled by__________________? a. fuel pump b. governor c. injector d. carburettor e. scavenging
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7) Diesel fuel, compared to petrol is_________________? a. less difficult to ignite b. just about the same difficult to ignite c. more difficult to ignite d. highly ignitable e. none of the above
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8) When crude oil is heated, then which of the following hydrocarbon is given off first______________? a. kerosene b. gasoline c. paraffin d. diesel e. natural gas
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9) A 75 cc engine has following parameter as 75 cc ___________________? a. fuel tank capacity b. lub oil capacity c. swept volume d. cylinder volume e. clearance volume
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10) Gaseous-fuel guarantees are based on___________________? a. calorific value of oil b. low heat value of oil c. high heat value of oil d. mean heat value of oil e. all of the above
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11) Polymerisation is a chemical process in which molecules of a compound become________________? a. larger b. slowed down c. smaller d. liquid e. gaseous
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12) In diesel engine, the compression ratio in comparison to expansion ratio is_______________? a. same b. less c. more d. variable e. more/less depending on engine capacity
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13) Engine pistons ‘are usually made of aluminium alloy because it_________________? a. is lighter b. wears less c. absorbs shocks d. is stronger e. does not react with fuel and lub oil
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14) The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________? a. same b. more c. less d. less or more depending on operating conditions e. unpredictable
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15) The size of inlet valve of.an engine in comparison to exhaust valve is_________________? a. more b. less c. same d. more/less depending on capacity of engine e. varies from design to design
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16) Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following______________?
Which of the following is false statement? a. piston ring and cylinder wear b. formation of hard coating on piston skirts c. oil sludge in the engine crank case d. detonation e. forms corrosive acids
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17) The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be________________? a. higher b. lower c. remain unaffected d. unpredictable e. none of the above
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18) The actual volume of fresh charge admitted in 4-stroke petrol engine is_________________? a. equal to stroke volume b. equal to stroke volume and clearance volume c. less than stroke volume d. more than stroke volume e. more than cylinder volume
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19) The reason for supercharging in any engine is to________________? a. increase efficiency b. increase power c. reduce weight and bulk for a given out-put d. effect fuel economy e. none of the above
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20) Supercharging is essential in_____________? a. diesel engines b. gas turbines c. petrol engines d. aircraft engines e. marine engines
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