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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

80°C
240°C
180°C
120°C

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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

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

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Internal Combustion Engines
In a cycle, the spark lasts roughly for

0.1 sec
1 sec
0.001 sec
0.01 sec

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Internal Combustion Engines
The injection pressure in a diesel engine is about

150 bar
10 bar
100 bar
500 bar

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Internal Combustion Engines
A spark plug gap is kept from

0.3 to 0.7 mm
0.4 to 0.9 mm
0.2 to 0.8 mm
0.6 to 1.0 mm

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Internal Combustion Engines
In a petrol engine, the mixture has the lowest pressure at the

None of these
End of suction stroke
Beginning of suction stroke
End of compression stroke

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