INTERNAL COMBUSTION ENGINES QUIZ

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

Cylinder walls being too hot

Red hot carbon deposits on cylinder walls

Any one of the listed here

Overheated spark plug points

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In the crankcase method of scavenging, the air pressure is produced by

Centrifugal pump

Natural aspirator

Movement of engine piston

Supercharger

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The frictional power (F.P.) is given by

P.

P.

F.P. = I.P./

F.P. =

P. - I.P.

F.P. =

F.P. = I.P. -

P./I.P.

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Scavenging is usually done to increase

Fuel consumption

Power output

Thermal efficiency

Speed

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The brake power is the power available

At the crank shaft

None of these

At the crank pin

In the engine cylinder

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A supercharged engine as compared to an ordinary engine

Requires smaller foundation

Is lighter

All of these

Consumes less lubricating oil

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Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided

Best quality fuel is used

It is properly designed

Cannot work as it is impossible

Flywheel size is proper

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The knocking in diesel engines may be prevented by

Reducing the delay period

All of these

Raising the compression ratio

Increasing the inlet pressure of air

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In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as

Detonation

Scavenging

Polymerisation

Supercharging

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A mixture containing 65% of iso-octane and 35% of normal heptane will have

Cetane number 35

Octane number 35

Cetane number 65

Octane number 65

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