Regenerative method of braking is based on that
A. Back e.m.f. is less than the applied voltage
B. Back e.m.f. is equal to the applied voltage
C. Back e.m.f. of rotor is more than the applied voltage
D. None of the above
Answer: Option C
This Question Belongs to Electrical Engineering >> D.C. Motors
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Comments ( 3 )
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
also this question is wrong correct answer c
Under this condition, the back emf Eb of the motor is greater than the supply voltage V, which reverses the direction of motor armature current.
option c
wrong answer right is c option