The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.

The knocking tendency in compression ignition engines for a given fuel will be

A

Enhanced by decreasing compression ratio

B

Enhanced by increasing compression ratio

C

Dependent on other factors

D

None of the above

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

A

Increase

B

Reduce

C

Not effect

D

None of these

In order to eliminate knocking in compression ignition engines, there should be

A

Short delay period

B

Late auto-ignition

C

Low compression ratio

D

High self ignition temperature of fuel

In petrol engines, advancing of the spark timing will _________ the knocking tendency.

A

Not effect

B

Decrease

C

Increase

D

None of these

With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.

A

Supercharging

B

Wall temperature

C

Compression ratio

D

Engine speed

In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.

A

Not effected

B

Decrease

C

Increase

D

None of these

The combustion in compression ignition engines is

A

Homogeneous

B

Heterogeneous

C

Both (A) and (B)

D

None of these

Combustion in compression ignition engines is

A

Homogeneous

B

Heterogeneous

C

Both (A) and (B)

D

Laminar

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 knocking in spark ignition engines can be reduced by

A

Retarding the spark

B

Increasing the engine speed

C

Both (A) and (B)

D

None of these

The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.

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