Related Questions

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

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