DIGITAL COMPUTER ELECTRONICS QUIZ

A diesel engine has compression ratio from

10 to 15

15 to 25

6 to 10

25 to 40

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The purpose of testing an internal combustion engine is

To conform the data used in design, the validity of which may be doubtful

All of these

To determine the information, which cannot be obtained by calculations

To satisfy the customer regarding the performance of the engine

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The accumulation of carbon in a cylinder results in increase of

Clearance volume

Ignition time

Volumetric efficiency

Effective compression ratio

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The thermal efficiency of petrol and gas engines is about

0.5

0.7

0.3

0.15

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In a cycle, the spark lasts roughly for

0.001 sec

0.1 sec

1 sec

0.01 sec

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

Supercharger

Natural aspirator

Centrifugal pump

Movement of engine piston

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In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

Below

Equal to

None of these

Above

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The pressure at the end of compression, in diesel engines, is approximately

25 bar

20 bar

10 bar

35 bar

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Scavenging air in diesel engine means

Burnt air containing products of combustion

Air used for combustion sent under pressure

Forced air for cooling cylinder

Air used for forcing burnt gases out of engine's cylinder during the exhaust period

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In diesel engine, the compression ratio in comparison to expansion ratio is

Less

Same

More

Variable

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