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Internal Combustion Engines

Internal Combustion Engines
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be

0.14
0.08
0.04
0.02

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Internal Combustion Engines
A mixture containing 65% of iso-octane and 35% of normal heptane will have

Octane number 35
Cetane number 35
Octane number 65
Cetane number 65

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Internal Combustion Engines
The knocking in diesel engines may be prevented by

Increasing the inlet pressure of air
Raising the compression ratio
All of these
Reducing the delay period

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Internal Combustion Engines
Crankcase explosion in I.C. engines usually occurs as

First a big explosion followed by a mil explosion
First a mild explosion followed by a bi explosion
Never occurs
Both mild and big explosions occurs simultaneously

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Internal Combustion Engines
Combustion in compression ignition engines is

Heterogeneous
Laminar
Homogeneous
Both (A) and (B)

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Internal Combustion Engines
The cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of

120
100
50

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MORE MCQ ON Internal Combustion Engines

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