If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

The most accurate ignition system of a spark ignition engine is

A

Magneto system

B

Battery system

C

Electronic control unit system

D

Magneto and electronic system

The ignition in a spark ignition engine takes place when the piston is

A

Exactly at the T.D.C. position on its compression stroke

B

Approaching the T.D.C. position on its compression stroke

C

Leaving the T.D.position on its compression stroke

D

Approaching the T.D.C. position on its exhaust stroke

The auto ignition in a spark ignition engine means

A

Automatic ignition of the charge at the end of compression

B

Ignition induced by the passage of a spark

C

Ignition of the charge before the passage of flame front

D

Ignition induced to supplement the process of normal combustion

In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have

A

Low density

B

Low temperature

C

Long ignition delay

D

All of these

The advancing of spark timing in spark ignition engines will _________ knocking tendency.

A

Increase

B

Reduce

C

Not effect

D

None of these

A basic difference between the spark ignition engine and the Diesel engine is that the

A

Diesel engine compresses air alone instead of an air-fuel mixture

B

Air temperature ignites the fuel in the Diesel engine

C

Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.on the compression stroke

D

All of the above

Air-petrol ratio for maximum power generation in spark ignition engine is about

A

6:1

B

12 : 1

C

18 : 1

D

24 : 1

If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called

A

Detonation

B

Ignition

C

Pre-ignition

D

Rumble

The ignition of the charge by some hot surface within the engine before the passage of spark is called

A

Pre-ignition

B

Detonation

C

Ignition delay

D

Auto-ignition

Which of the following does not relate to a spark ignition engine?

A

Ignition coil

B

Spark plug

C

Carburettor

D

Fuel injector

If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

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