$A$ Carnot engine has an efficiency of $50\%$ when its source is at a temperature $327^{\circ}C$. The temperature of the sink is $.........^{\circ}C$.

$A$ Carnot cycle operating between $T_H = 600 \ K$ and $T_C = 300 \ K$ produces $1.5 \ kJ$ of mechanical work per cycle. The heat transferred to the engine by the reservoir is: (in $kJ$)

Which type of process is performed in an ideal engine?

Consider a Carnot cycle operating between $T_1 = 500\,K$ and $T_2 = 300\,K$ producing $1\,kJ$ of mechanical work per cycle. Find the heat transferred to the engine by the reservoir at $T_1$ in Joules.

What is the efficiency of a Carnot engine working between the boiling point and the freezing point of water (in $\%$)?

In practice,all heat engines have an efficiency less than that of a Carnot engine because