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Internal Combustion MCQ Question with Answer

Internal Combustion MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 29
The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of

Morse test
Prony brake test
Motoring test
Heat balance test

Question No : 30
In a diesel engine, the fuel is ignited by

Spark
Injected fuel
Heat resulting from compressing air that is supplied for combustion
Ignition

Question No : 31
The thermal efficiency of petrol and gas engines is about

15 %
30 %
50 %
70 %

Question No : 32
In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have

Low density
Low temperature
Long ignition delay
All of these

Question No : 33
In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as

Scavenging
Detonation
Supercharging
Polymerisation

Question No : 34
The expansion of fuel in a four stroke cycle diesel engine

Starts at 15° before top dead centre and ends at 30° after top dead centre
Starts at top dead centre and ends at 30° after top dead centre
Starts at 15° after top dead centre and ends at 30° before bottom dead centre
May start and end anywhere

Question No : 35
The ratio of the brake power to the indicated power is called

Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Volumetric efficiency