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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
Low density
All of these
Long ignition delay

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Internal Combustion Engines
In a naturally aspirated diesel engine, the air is supplied by

An injection tube
A centrifugal blower
A vacuum chamber
A supercharger

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Internal Combustion Engines
The actual volume of fresh charge admitted in 4-stroke petrol engine is

Equal to stroke volume and clearance volume
Equal to stroke volume
Less than stroke volume
More than stroke volume

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Internal Combustion Engines
Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to

Red hot carbon deposits on cylinder walls
Cylinder walls being too hot
Overheated spark plug points
Any one of the listed here

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Internal Combustion Engines
The thermal efficiency of diesel engines is about

0.3
0.5
0.7
0.15

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Internal Combustion Engines
The pressure inside the cylinder is _________ the atmospheric pressure during the exhaust stroke.

Below
Equal to
None of these
Above

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