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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

120°C
180°C
80°C
240°C

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Internal Combustion Engines
Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of

50
100
120
0

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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

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

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Internal Combustion Engines
If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

Dynamic similarity
Kinematic similarity
Geometric similarity
None of these

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Internal Combustion Engines
The ignition of the charge by some hot surface within the engine before the passage of spark is called

Auto-ignition
Detonation
Pre-ignition
Ignition delay

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Internal Combustion Engines
The basic requirement of a good combustion chamber is

Minimum turbulence
Low volumetric efficiency
Low compression ratio
High thermal efficiency and power output

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