Internal Combustion (IC) Engines MCQ Questions and Answers

Internal Combustion (IC) Engines MCQ Questions and Answers

1-The preference of diesel engines for road transport is due to

(A) harmless exhaust

(B) complete combustion of charge

(C) low specific fuel consumption over a large range of load

(D) Easy starting


2-The air–fuel ratio for idling speed of an automobile petrol engine is closer to

(A) 21:1

(B) 17:1

(C) 15:1

(D) 10:1


3-In diesel engine, the compression ratio in comparison to expansion ratio is

(A) variable

(B) more

(C) less

(D) same


4-Velocity of flame propagation in the SI engine is maximum for air fuel mixture which is ___ stoichiometric.

(A) 10% leaner than

(B) more than 10% richer than

(C) equal to

(D) 10% richer than


5-Which one of the following configurations has the highest fin effectiveness?

(A) Thick, closed spaced fins

(B) Thick, widely spaced fins

(C) Thin, widely spaced fins

(D) Thin, closely spaced fins


6-The power actually developed inside the engine cylinder is called as

(A) Frictional power

(B) Indicated power

(C) Brake power

(D) None of these


7-Piston in IC Engine is usually made of

(A) Aluminium alloy

(B) Nickel alloy

(C) Tungsten alloy

(D) Copper alloy


8-In a gasoline engine, the tendency of detonation increases with

(A) Increasing the cooling rate

(B) Supercharging

(C) Running the engine at high speeds

(D) Retarded spark timings


9-The sequence order of events in a four stroke engine is

(A) Exhaust-compression-power-suction

(B) Suction-compression-power-exhaust

(C) Suction-power-compression-exhaust

(D) Suction-exhaust-power-compression


10-Supercharging is the process of

(A) supplying compressed air to remove combustion products fully

(B) injecting excess fuel for raising more load

(C) providing forced cooling air

(D) supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere



1-(C), 2-(D), 3-(B), 4-(D), 5-(D), 6-(B), 7-(A), 8-(B), 9-(B), 10-(D)