Internal Combustion Engines
In the opposed piston diesel engine, the combustion chamber is located

Above the piston
There is no such criterion
Below the piston
Between the pistons

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Internal Combustion Engines
Detonation is harmful due to

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

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Internal Combustion Engines
Flash point of fuel oil is

Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Temperature at which it catches fire without external aid
Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Temperature at which it solidifies or congeals

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