Question

Electrical time-constant of an armature-controlled dc servomotor is :

(a) Equal to mechanical time-constant

(b) Smaller than mechanical time-constant

(c) Larger than mechanical time-constant

(d) Not related to mechanical time-constant

I got this question at a job interview.

I want to ask this question from Construction of Phase-Trajectories in section Nonlinear Systems of Control Systems

Answer 1

Right choice is (b) Smaller than mechanical time-constant

Explanation: Electrical time constant is smaller than the mechanical time constant and hence the delay in the mechanical systems is more than the electrical systems.