In a differentially compounded D.C. motor, if shunt field suddenly opens
A. The motor will first stop and then run in opposite direction as series motor
B. The motor will work as series motor and run at slow speed in the same direction
C. The motor will work as series motor and run at high speed in the same direction
D. The motor will not work and come to stop
Answer: Option A
This Question Belongs to Electrical Engineering >> D.C. Motors
The condition for maximum efficiency for a D.C. generator is
A. Eddy current losses = stray losses
B. Hysteresis losses = eddy current losses
C. Copper losses = 0
D. Variable losses = constant losses
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 currents
The speed of a D.C. shunt motor can be increased by
A. Increasing the resistance in armature circuit
B. Increasing the resistance in field circuit
C. Reducing the resistance in the field circuit
D. Reducing the resistance in the armature circuit
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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