GO Electrical
0 votes

The separately excited $dc$ motor in the figure below has a rated armature current of $20$ $A$ and a rated
armature voltage of $150$ $V$. An ideal chopper switching at $5$ $kHz$ is used to control the armature
voltage. If $L_a$= $0.1$ $mH$, $R_a$= $1$ $\Omega$, neglecting armature reaction, the duty ratio of the chopper to
obtain $50$% of the rated torque at the rated speed and the rated field current is

  1. $0.4$
  2. $0.5$
  3. $0.6$
  4. $0.7$
in Electrical and Electronic Measurements by (1.5k points)
recategorized by

Please log in or register to answer this question.

Welcome to GATE Overflow, Electrical, where you can ask questions and receive answers from other members of the community.

847 questions
37 answers
25,980 users