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Internal Combustion MCQ - Multiple Choice Question and Answer

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

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Question No : 15
A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

248 cm3
252 cm3
264 cm3
286 cm3

Question No : 16
Air fuel ratio for idling speed of a petrol engine is approximately

1 : 1
5 : 1
10 : 1
15 : 1

Question No : 17
The thermal efficiency of diesel engines is about

15 %
30 %
50 %
70 %

Question No : 18
It the temperature of intake air in IC engines is lowered, then its efficiency will

Increase
Decrease
Remain same
Increase up to certain limit and then decrease

Question No : 19
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

Question No : 20
The object of providing masked inlet valve in the air passage of compression ignition engines is to

Enhance flow rate
Control air flow
Induce primary swirl
Induce secondary turbulence

Question No : 21
The sensing element in the control system of nuclear reactors measures the _________ of the neutron flux in the reactor.

Temperature
Volume
Density
None of these