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Internal Combustion Engines

Internal Combustion Engines
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed

240°C
180°C
120°C
80°C

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Internal Combustion Engines
In a four stroke cycle engine, the sequence of operations is

Suction, compression, expansion and exhaust
Compression, expansion, suction and exhaust
Expansion, compression, suction and exhaust
Suction, expansion, compression and exhaust

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

Not effect
Decrease
Increase
None of these

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Internal Combustion Engines
In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

Below
Above
Equal to
None of these

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Internal Combustion Engines
If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is

2V₁ / (V₀ + V₁)
V₀ / (V₀ + V₁)
V₁ / (V₀ + V₁)
2V₀ / (V₀ + V₁)

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Internal Combustion Engines
The knocking tendency in spark ignition engines may be decreased by

Controlling the ignition timing
Reducing the compression ratio
Controlling the exhaust temperature
Controlling the air-fuel mixture

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