GO Electrical
0 votes

A $\text{250 V}$ dc shunt motor has an armature resistance of $0.2\:\Omega$ and a field resistance

of $100\:\Omega$. When the motor is operated on no-load at rated voltage, it draws an

armature current of $\text{5 A}$ and runs at $\text{1200 rpm}$. When a load is coupled to the

motor, it draws total line current of $\text{50 A}$ at rated voltage, with a $5$ % reduction in

the air-gap flux due to armature reaction. Voltage drop across the brushes can be

taken as $\text{1 V}$ per brush under all operating conditions. The speed of the motor, in

$\text{rpm}$ under this loaded condition, is closest to:

  1. $1200$
  2. $1000$
  3. $1220$
  4. $900$
in new by (1.4k points)
edited 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.

912 questions
38 answers
27,594 users