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Internal Combustion Engines

Internal Combustion Engines
The thermal efficiency of petrol and gas engines is about

0.15
0.7
0.5
0.3

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Internal Combustion Engines
In a petrol engine, if diesel is used, then the engine will

Run at high speed
Not run
Run more efficiently
Explode

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Internal Combustion Engines
The mechanical efficiency (ηm) of the engine is given by

ηm = I.P/B.P
None of these
ηm = B.P/I.P
ηm = (B.P × I.P)/100

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Internal Combustion Engines
The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 - rγ - 1
1 - (1/rγ - 1)
None of these
1 + rγ - 1

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Internal Combustion Engines
The inlet valve of a four stroke cycle internal combustion engine remains open for

130°
180°
230°
270°

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

0
50
120
100

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MORE MCQ ON Internal Combustion Engines

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