A cycle pump gets hot near the nozzle after a few quick strokes even if they are smooth because:

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the volume of air decreases at constant pressure

the number of air molecules increases

the piston causes lot of friction

the process is so quick that exchange of heat with the environment does not take place. An adiabatic compression causes increase in temperature

answer is D.

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Detailed Solution

In adiabatic compression internal energy will be increased which results increase in temperature.

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