Question

A thermal cycle receives 2000 kJ of heat from a heat source at 1000 K. It rejects 300 kJ of heat to a heat sink at 300 K and also rejects 250 kJ of heat to another heat sink at 200 K during the cycle. The cycle is

• A. reversible
• B. irreversible
• C. impossible
• D. work absorbing

Answer 1

The correct option is B irreversible

$\oint \left(\frac{\delta Q}{\delta T}\right)=\frac{2000}{1000}-\frac{300}{300}-\frac{250}{200}$

$\oint \left(\frac{\delta Q}{\delta T}\right)<0$
So, it is an irreversible cycle.