GO Electrical
0 votes

The separately excited $dc$ motor in the figure below has a rated armature current of $20A$ 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)
edited by

Please log in or register to answer this question.

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

847 questions
37 answers
10 comments
26,080 users