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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 temperature
Long ignition delay
Low density
All of these

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

0.01 sec
1 sec
0.001 sec
0.1 sec

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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

Ignition delay
Pre-ignition
Auto-ignition
Detonation

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Internal Combustion Engines
The size of inlet valve of an engine in comparison to exhaust valve is

Less
More/less depending on capacity of engine
More
Same

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Internal Combustion Engines
The correct mixture strength (by weight) for petrol is about

14.6 : 1
20.4 : 1
18.5 : 1
22.6 : 1

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Internal Combustion Engines
If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by

[2(V₀/V₁)]/ [1 + (V₀/V₁)²]
V₁/(V₀ + V₁)
V₀/(V₀ + V₁)
(V₀/V₁)/ [1 + (V₀/V₁)²]

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MORE MCQ ON Internal Combustion Engines

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