The temperature of the system decreases in an:

Adiabatic compression

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Isothermal compression

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Isothermal expansion

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Adiabatic expansion

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Solution

The correct option is D Adiabatic expansion
Work done in an adiabatic process is given as:
$w = △ U$
$w = - P △ V = n C_{v} △ T$
In adiabatic explansion work is done by the system so $w = - v e$ as per sign convention. So,
$n C_{v} △ T = - i v e$
means $△ T = - i v e$
so,
final tempearture ( $T_{2}$ ) is less than initial temperature ( $T_{1}$ ).
hence, temperature decreases.
In adiabatic compression T increases and in isothermal processes, T remains same.

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