Heat and Thermodynamics II - SS1 Physics Past Questions and Answers - page 5

The efficiency of a heat engine can be improved by:

Which type of heat engine has the highest theoretical efficiency?

In a heat engine, the net work output is equal to:

A heat engine receives 500 J of heat energy from a high-temperature source and releases 300 J of heat energy to a low-temperature sink. What is the efficiency of the heat engine?

A heat engine has an efficiency of 25% and releases 400 J of heat energy to a low-temperature sink. How much work is done by the engine?

A Carnot engine operates between a high-temperature reservoir at 400 K and a low-temperature reservoir at 100 K. The heat input to the engine is 800 J. What is the heat output of the engine? 

An ideal heat engine has an efficiency of 60% and produces 400 J of work output. What is the heat input to the engine?

A heat engine receives 800 J of heat energy from a high-temperature source and has an efficiency of 50%. How much work is done by the engine?

Which of the following is a primary function of a refrigeration system?

In a refrigeration system, the working substance that absorbs heat from the refrigerated space is called: