**What is the maximum fluctuation of energy?**

a) It is the sum of maximum and minimum energies

b) It is the ratio of the maximum and minimum energies

c) It is the ratio of the mean resisting torque to the work done per cycle

d) It is the difference between the maximum and minimum energies

**Answer:**

d) It is the difference between the maximum and minimum energies

**Explanation:**

The difference between the maximum and minimum energies is called the maximum energy fluctuation. The turning moment diagram for one entire cycle of operation can be used to determine energy fluctuation.