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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

Low density
Long ignition delay
Low temperature
All of these

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Internal Combustion Engines
The advancing of spark timing in spark ignition engines will ___ knocking tendency.

None of the listed here
Increase
Reduce
Not effect

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Internal Combustion Engines
A stoichiometric air-fuel ratio is

Chemically correct mixture
Rich mixture for idling
Rich mixture for over loads
Lean mixture

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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

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

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Internal Combustion Engines
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of

500°C
250°C
2000°C
1000°C

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Internal Combustion Engines
For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

0.62569444444444
0.50069444444444
0.75069444444444
0.37569444444444

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