Why does DC motor sometimes run too fast when under-loaded?

To implement armature voltage control, it must be ensured that

A laboratory group was working with a set of 3-hp shunt DC motor. But there was a mistake that it was fused with a 0.3A fuse instead 3A fuse. Then it was started

The PWM control of DC motor varies

Mark the wrong option. Which of the following cause and effect behaviour in speed control is correct when field resistance is increased.

Armature voltage control works for speeds _____ base speed and field resistance control works well for speed _____ base speed.

The torque limit of speed for a shunt motor

Ward-Leonard system of system of speed control is not recommended for

Small DC motors have best speed control by

Run-away for large DC machine is avoided by using

At a very low speed, increase in field resistance will