In a Carnot engine,as the gas gives heat energy to the sink,the temperature of the sink

Even a Carnot engine cannot give $100\%$ efficiency because we cannot

When the temperature difference between the source and sink increases,the efficiency of the heat engine

In a Carnot engine,the temperature of the reservoir is $527^{\circ} C$ and that of the sink is $200 \; K$. If the work done by the engine when it transfers heat from the reservoir to the sink is $12000 \; kJ$,the quantity of heat absorbed by the engine from the reservoir is $x \times 10^{6} \; J$. Find the value of $x$.

The efficiency of a Carnot engine depends upon

If a Carnot engine works between $127^{\circ} C$ and $527^{\circ} C$,then its efficiency is ...... $\%$