Question

Ward Leonard method is ___________

(a) Armature control method

(b) Field control method

(c) Combination of armature control method and field control method

(d) Totally different from armature and field control method

This question was addressed to me during a job interview.

Query is from Ward Leonard Speed Control Method in portion DC Motors of DC Machines

Answer 1

The correct choice is (c) Combination of armature control method and field control method

For explanation I would say: Ward Leonard method is the combination of armature control method and field control method, which can also be called as voltage control method. This is the most efficient method of speed control over wide range.