The pressure at the end of compression in the case of diesel engine is of the order of

In case of a Diesel car, the pressure at the end of compression is of the order of

A

15 bar

B

25 bar

C

35 bar

D

45 bar

The compression ratio in petrol engine is kept less than in Diesel engine because

A

It makes petrol engines lighter

B

Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

C

Less compression ratio gives better performance

D

It is just customary to have less compression ratio in petrol engines

The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be

A

More

B

Less

C

Same

D

Data insufficient to predict

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

A

10 bar

B

20 bar

C

25 bar

D

35 bar

In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of

A

250°C

B

500°C

C

1000°C

D

2000°C

The pressure and temperature at the end of compression stroke in a petrol engine are of the order of

A

4 - 6 kg/cm² and 200 - 250°C

B

6 - 12 kg/cm² and 250 - 350°C

C

12 - 20 kg/cm² and 350 - 450°C

D

20 - 30 kg/cm² and 450 - 500°C

In a four stroke cycle diesel engine, the compression

A

Starts at 40° after bottom dead center and ends at 10° before top dead center

B

Starts at 40° before top dead center and ends at 40° after top dead center

C

Starts at top dead center and ends at 40° before bottom dead center

D

May start and end anywhere

A diesel engine has compression ratio from

A

6 to 10

B

10 to 15

C

15 to 25

D

25 to 40

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

A

Same

B

Less

C

More

D

Variable

For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

A

Increase

B

Decrease

C

Remain unaffected

D

Other factors control it

The pressure at the end of compression in the case of diesel engine is of the order of

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