In D.C. shunt motors as load is reduced
A. The speed will increase abruptly
B. The speed will increase in proportion to reduction in load
C. The speed will remain almost/constant
D. The speed will reduce
Answer: Option C
Solution (By Examveda Team)
In a D.C. shunt motor, the field winding is connected in parallel (shunt) with the armature winding.Since the field winding is connected directly across the supply, the field current remains nearly constant regardless of the load.
As a result, the magnetic field produced is stable, and any small change in armature current due to load variation has minimal effect on the speed.
Therefore, even when the load is reduced, the motor speed does not change significantly.
This is why D.C. shunt motors are widely used where constant speed is required.
Correct Answer: Option C
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Comments (1)
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 a dc shunt motor if the load is reduced then speed will be slightly increase