Question

For constant torque drive which of the following speed control method is preferred?

(a) Field control

(b) Armature voltage control

(c) Shunt armature control

(d) Voltage control

The question was asked in class test.

This interesting question is from Speed Control Using Armature Control in DC Motor topic in division DC Motors of DC Machines

Answer 1

Right option is (b) Armature voltage control

Easiest explanation: Armature control method provides a constant-torque drive. In the shunt motor case by keeping the field current at maximum value full motor torque can be obtained at full-load armature current at all speeds.