The maximum work output from a certain heat input in a cyclic heat engine is called as _________.

The maximum work output from a certain heat input in a cyclic heat engine is called as _________.

a. Maximum energy
b. Total energy
c. Available energy
d. Actual energy

Correct Answer : c. Available energy

Explanation :

Work output is obtained from utilizing heat energy in heat engine. According to the second law of thermodynamics all heat energy can not be converted into work output. So the maximum work output from a certain heat input in a cyclic heat engine is called as available energy. Some amount of heat energy is rejected to the sink, this minimum energy is called as unavailable energy.
Therefore,
Heat Supplied = Available energy + Unavailable energy