Which of the following application requires high starting torque ?
Which of the following application requires high starting torque ?
A. Lathe machine
B. Centrifugal pump
C. Locomotive
D. Air blower
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The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is______________?
The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is______________?
A. 2.36%
B. 4.76%
C. 6.77%
D. 8.84%In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be_____________?
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be_____________?
A. almost negligible
B. rated full-load current
C. less than full-load current
D. more than full-load currentThe starting resistance of a D.C. motor is generally_______________?
The starting resistance of a D.C. motor is generally_______________?
A. low
B. around 500 Q
C. 1000 Q
D. infinitely largeWhat will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
A. The motor will stop
B. The motor will continue to run
C. The armature may burn
D. The motor will run noisyThe ratio of starting torque to full-load torque is least in case of____________?
The ratio of starting torque to full-load torque is least in case of____________?
A. series motors
B. shunt motors
C. compound motors
D. none of the aboveArmature reaction in dc motor results___________?
Armature reaction in dc motor results___________?
A. decrease in speed
B. increase in speed
C. short circuit
D. open circuit