Which D.C. motor has got maximum self relieving property?
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor
Answer: Option A
This Question Belongs to Electrical Engineering >> D.C. Motors
Join The Discussion
Comments ( 2 )
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
dc motor without load theoretically danger due to un controlled speed but when dc series motor connected load armature draw a more power and this power create powerfull toque but the current flow a field winding this cause of reason motor run slow but more torque or this torque handle havy load with no tension
this is the reason
DC series motor develops large starting torque initially and slow down with increase in load and so get automatically relived from heavy excessive load. Thus, DC series motor is called as self-reliving machine.