Thermal Efficiency | MCQs

Explanation

Initial efficiency (η) = 40% = 0.4

Sink temperature (Tc) = 300 K

Initial source temperature (Th) = 300 / (1 - 0.4) = 500 K

New efficiency (η_new) = 0.4 + 0.5(0.4) = 0.6

New source temperature (Th_new) = 300 / (1 - 0.6) = 750 K

Increase in temperature = Th_new - Th = 750 - 500 = 250 K

Explanation

Efficiency is the ratio of output to input, often expressed as a percentage.

It represents how much of the input energy is actually converted into useful output energy, with the rest being lost as waste or heat.

Key Points:

• Energy is the ability to do work.
• Work is the transfer of energy through a force applied over a distance.
• Power is the rate at which work is done or energy is transferred.