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Internal Combustion Engines

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

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

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Internal Combustion Engines
The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

1
0.7
0.5
0.25

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Internal Combustion Engines
The air-fuel ratio of the petrol engine is controlled by

Carburettor
Fuel pump
Injector
Governor

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Internal Combustion Engines
Gaseous fuel guarantees are based on

Low heat value of oil
Calorific value of oil
Mean heat value of oil
High heat value of oil

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Internal Combustion Engines
If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by

(V₀/V₁)/ [1 + (V₀/V₁)²]
V₀/(V₀ + V₁)
V₁/(V₀ + V₁)
[2(V₀/V₁)]/ [1 + (V₀/V₁)²]

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Internal Combustion Engines
The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

Same
Less
More or less depending on power rating
More

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MORE MCQ ON Internal Combustion Engines

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