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MCQs 1: Which of the following is not an interns combustion engine___________________?

2-stroke petrol engine 4-stroke petrol engine diesel engine gas turbine steam turbine
Answer Explanation

MCQs 2: The output of a diesel engine can be increased without increasing the engine revolution or size in following way_________________?

feeding more fuel increasing flywheel size heating incoming air scavenging supercharging
Answer Explanation

MCQs 3: In a typical medium speed 4-stroke cycle diesel engine________________?

compression starts at 35° after bottom dead center and ends at top dead center compression starts at bottom dead center and ends at top dead center compression starts at 10° before bottom dead center and, ends just before top dead center may start and end anywhere none of the above
Answer Explanation

MCQs 4: The precess of breaking up or a lipuid into fine droplets by spraying is called___________________?

vaporisation carburetion ionisation injection atomisation
Answer Explanation

MCQs 5: The accunmulation of carbon in a cylinder results in increase of________________?

clearance volume volumetric efficiency ignition time effective compression ratio valve travel time
Answer Explanation

MCQs 6: The air-fuel ratio of the petrol engine is controlled by__________________?

fuel pump governor injector carburettor scavenging
Answer Explanation

MCQs 7: Diesel fuel, compared to petrol is_________________?

less difficult to ignite just about the same difficult to ignite more difficult to ignite highly ignitable none of the above
Answer Explanation

MCQs 8: When crude oil is heated, then which of the following hydrocarbon is given off first______________?

kerosene gasoline paraffin diesel natural gas
Answer Explanation

MCQs 9: A 75 cc engine has following parameter as 75 cc ___________________?

fuel tank capacity lub oil capacity swept volume cylinder volume clearance volume
Answer Explanation

MCQs 10: Gaseous-fuel guarantees are based on___________________?

calorific value of oil low heat value of oil high heat value of oil mean heat value of oil all of the above
Answer Explanation

MCQs 11: Polymerisation is a chemical process in which molecules of a compound become________________?

larger slowed down smaller liquid gaseous
Answer Explanation

MCQs 12: In diesel engine, the compression ratio in comparison to expansion ratio is_______________?

same less more variable more/less depending on engine capacity
Answer Explanation

MCQs 13: Engine pistons ‘are usually made of aluminium alloy because it_________________?

is lighter wears less absorbs shocks is stronger does not react with fuel and lub oil
Answer Explanation

MCQs 14: The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?

same more less less or more depending on operating conditions unpredictable
Answer Explanation

MCQs 15: The size of inlet valve of.an engine in comparison to exhaust valve is_________________?

more less same more/less depending on capacity of engine varies from design to design
Answer Explanation

MCQs 16: Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following______________?
Which of the following is false statement?

piston ring and cylinder wear formation of hard coating on piston skirts oil sludge in the engine crank case detonation forms corrosive acids
Answer Explanation

MCQs 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________________?

higher lower remain unaffected unpredictable none of the above
Answer Explanation

MCQs 18: The actual volume of fresh charge admitted in 4-stroke petrol engine is_________________?

equal to stroke volume equal to stroke volume and clearance volume less than stroke volume more than stroke volume more than cylinder volume
Answer Explanation

MCQs 19: The reason for supercharging in any engine is to________________?

increase efficiency increase power reduce weight and bulk for a given out-put effect fuel economy none of the above
Answer Explanation

MCQs 20: Supercharging is essential in_____________?

diesel engines gas turbines petrol engines aircraft engines marine engines
Answer Explanation

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