The armature torque of the D.C. shunt motor is proportional to____________?
The armature torque of the D.C. shunt motor is proportional to____________?
A. field flux only
B. armature current only
C. both A. and B.
D. none of the above
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D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the________________?
D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the________________?
A. series motor
B. shunt motor
C. compound motor
D. any of the aboveFor which types of D.C. motor, dynamic braking is generally used ?
For which types of D.C. motor, dynamic braking is generally used ?
A. Shunt motors
B. Series motors
C. Compound motors
D. All of the aboveIn D.C. machines the residual magnetism is of the order of_________________?
In D.C. machines the residual magnetism is of the order of_________________?
A. 2 to 3 per cent
B. 10 to 15 per cent
C. 20 to 25 per cent
D. 50 to 75 per centWith the increase in temperature, the speed of DC shunt motor____________?
With the increase in temperature, the speed of DC shunt motor____________?
A. decreases.
B. increases
C. remain same
D. none of the aboveNo-load speed of which of the following motor will be highest ?
No-load speed of which of the following motor will be highest ?
A. Shunt motor
B. Series motor
C. Cumulative compound motor
D. Differentiate compound motorWard-Leonard control is basically a____________?
Ward-Leonard control is basically a____________?
A. voltage control method
B. field divertor method
C. field control method
D. armature resistance control method