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Internal Combustion Engines

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)

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

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Internal Combustion Engines
Stoichiometric ratio is

Actual air-fuel ratio for maximum efficiency
Chemically correct air-fuel ratio by volume
None of these
Chemically correct air-fuel ratio by weight

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Internal Combustion Engines
The minimum cranking speed in case of petrol engine is about

Half the operating speed
250 - 300 rpm
One fourth of operating speed
60 - 80 rpm

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Internal Combustion Engines
The normal heptane (C₇H₁₆) is given a rating of ________ octane number.

120
0
100
50

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Internal Combustion Engines
When crude oil is heated, then which of the following hydrocarbon is given off first?

Gasoline
Natural gas
Paraffin
Kerosene

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Internal Combustion Engines
The object of providing masked inlet valve in the air passage of compression ignition engines is to

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

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