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Internal Combustion Engines

Internal Combustion Engines
The knocking in spark ignition engines can be reduced by

Increasing the engine speed
Retarding the spark
Both (A) and (B)
None of these

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Internal Combustion Engines
The ignition quality of petrol is expressed by

All of these
Octane number
Calorific value
Cetane number

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Internal Combustion Engines
The pressure at the end of compression, in petrol engines, is approximately

25 bar
20 bar
10 bar
35 bar

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Internal Combustion Engines
A petrol engine, during suction stroke draws

Petrol only
Air only
None of these
A mixture of petrol and air

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Internal Combustion Engines
In a diesel engine, the duration between the time of injection and ignition, is known as

Delay period
Pre-ignition period
Period of ignition
Burning period

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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

Pre-ignition
Auto-ignition
Ignition delay
Detonation

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