A motor sometimes burns out when its load is suddenly increased because the resulting sudden decrease in its rotational frequency causes
A) an increased back EMF and an increased current flow.
B) a decreased back EMF and a decreased current flow.
C) a decreased back EMF and zero current flow.
D) an increased back EMF and a decreased current flow.
E) a decreased back EMF and an increased current flow.

Question

Quizplus · Accepted Answer

When the load on a motor increases suddenly, the rotational speed decreases, leading to a decrease in back EMF. This results in an increased current flow, which can cause the motor to burn out.

A Motor Sometimes Burns Out When Its Load Is Suddenly