Related Questions

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
In diesel engine, the compression ratio in comparison to expansion ratio is
A Same
B Less
C More
D Variable
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
In practice, the compression ratio of compression-ignition (CI) engine ranges from
A 15 to 25
B 5 to 10
C 40 to 55
D 60 to 70
The pressure at the end of compression in the case of diesel engine is of the order of
A 6 kg/cm
B 12 kg/cm
C 20 kg/cm
D 35 kg/cm
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
The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will
A Increase
B Decrease
C Be independent
D May increase or decrease depending on other factors
Highest useful compression ratio (HUCR) is the highest compression ratio at which the
A Engine can run
B Engine gives maximum output
C Engine is most efficient
D Fuel can be used in a test engine without knocking
The output of a diesel engine can be increased without increasing the engine revolution or size in following way
A Feeding more fuel
B Heating incoming air
C Scavenging
D Supercharging

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