A D.C. series motor is that which
A. Has its field winding consisting of thick wire and less turns
B. Has a poor torque
C. Can be started easily without load
D. Has almost constant speed
Answer: Option A
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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
how have dc motor has field winding consisting of thick wire and less turn
The type of DC motor used for shear and punched is
DC motor used for shear and punched is