In case of conductively compensated D.C. series motors, the compensating winding is provided
A. As separately wound unit
B. In parallel with armature winding
C. In series with armature winding
D. In parallel with field winding
Answer: Option C
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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
In DC series motor, compensating winding is provided in series with the armature windings which reduce sparking in commutation and prevent field owing to armature reaction.