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Internal Combustion Engines

Internal Combustion Engines
In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have

Long ignition delay
Low density
Low temperature
All of these

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Internal Combustion Engines
An hmh flame speed is obtained in diesel engine when air fuel ratio is

About 35% of rich mixture
Chemically correct mixture
Uniform throughout the mixture
About 10% of rich mixture

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Internal Combustion Engines
The operation of forcing additional air under pressure into the engine cylinder is known as

Carburetion
Turbulence
Delay period
Supercharging

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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 cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of

50
120
0
100

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Internal Combustion Engines
The pressure and temperature at the end of compression stroke in a petrol engine are of the order of

20-30 kg/cm² and 450-500°C
6-12 kg/cm² and 250-350°C
12-20 kg/cm² and 350-450°C
4-6 kg/cm² and 200-250°C

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