Internal Combustion Engines
A diesel engine as compared to petrol engine (both running and rated load) is

Less efficient
Other factors will decide it
More efficient
Equally efficient

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Internal Combustion Engines
As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

Increase maximum pressure and decrease maximum temperature
Increase maximum pressure and maximum temperature
Decrease maximum pressure and increase maximum temperature
Reduce maximum pressure and maximum temperature

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