The armature voltage control of D.C. motor provides____________?
The armature voltage control of D.C. motor provides____________?
A. constant torque drive
B. constant voltage drive
C. constant current drive
D. none of the above
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Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?
Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?
A. Providing laminations in armature core
B. Providing laminations in stator
C. Using non-magnetic material for frame
D. Using material of low hysteresis co-efficient for armature core materialWhich D.C. motor is generally preferred for cranes and hoists ?
Which D.C. motor is generally preferred for cranes and hoists ?
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motorIf the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will_________?
If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will_________?
A. increase
B. decrease
C. remain same
D. become zeroWhich of the following motor has the poorest speed regulation ?
Which of the following motor has the poorest speed regulation ?
A. Shunt motor
B. Series motor
C. Differential compound motor
D. Cumulative compound motorIf a D.C. motor is connected across the A.C. supply it will_______________?
If a D.C. motor is connected across the A.C. supply it will_______________?
A. run at normal speed
B. not run
C. run at lower speed
D. burn due to heat produced in the field winding by .eddy currentsThe 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 above