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Internal Combustion Engines

Internal Combustion Engines
A diesel engine has

4 valves
1 valve
3 valves
2 valves

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

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Internal Combustion Engines
Alpha-methyl-naphthalene (C11H10) has a cetane number of

50
100
120
0

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Internal Combustion Engines
Number of working strokes per min. for a four stroke cycle engine are _________ the speed of the engine in r.p.m.

Twice
One-half
Equal to
Four-times

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Internal Combustion Engines
The increase of cooling water temperature in petrol engine will _________ the knocking tendency.

Increase
None of these
Decrease
Not effect

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Internal Combustion Engines
A petrol engine has compression ratio from

10 to 15
15 to 25
6 to 10
25 to 40

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