A. 100%
B. around 90%
C. anywhere between 75% and 90%
D. less than 50%
0
The ratio of starting torque to full-load torque is least in case of____________?
0
In D.C. motor which of the following can sustain the maximum temperature rise?
A. series motors
B. shunt motors
C. compound motors
D. none of the above
0
Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
A. Slip rings
B. Commutator
C. Field winding
D. Armature winding
0
Which of the following load normally needs starting torque more than the rated torque?
A. Lenz’s law
B. Faraday’s law
C. Coloumb’s law
D. Fleming’s left-hand rule
0
The starting resistance of a D.C. motor is generally_______________?
A. Blowers
B. Conveyors
C. Air compressors
D. Centrifugal pumps
0
The speed of a D.C. series motor is_____________?
A. low
B. around 500 Q
C. 1000 Q
D. infinitely large
0
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
A. proportional to the armature current
B. proportional to the square of the armature current
C. proportional to field current
D. inversely proportional to the armature current
0
The current drawn by the armature of D.C. motor is directly proportional to__________?
A. 100% of the previous value
B. 50% of the previous value
C. 25% of the previous value
D. 10% of the previous value
E. none of the above
0
The power mentioned on the name plate of an electric motor indicates____________?
A. the torque required
B. the speed of the motor
C. the voltage across the terminals
D. none of the above
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