Internal Combustion Engines
Detonation is harmful due to

Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
High intensity of knock causes crankshaft vibration and the engine runs rough
None of these

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Internal Combustion Engines
The delay period in compression ignition engines depends upon

Relative velocity between the fuel injection and air turbulence pressure of residual gases
Nature of the fuel mixture strength
Temperature and pressure in the cylinder at the time of injection
All of these

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Internal Combustion Engines
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

Flow is produced due to the static head in the float chamber
The flow from the main jet is diverted to the compensating jet with increase in speed
The diameter of the jet is constant and the discharge coefficient is invariant
Jet area is automatically varied depending on the suction

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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

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

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