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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Resistance split phase
 Capacitor start
 Capacitor run

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 Eb is zero, but Td is unchanged
 both Eb and Td are unchanged
 both Eb and Td are zero
 Eb is unchanged, but Td is zero

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Electrical Machines
DC series motor is best suited for electric traction as

 It runs at very high speed at light load.
 It is cheaper in cost.
  It develops high starting torque.
 It consume less power.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 armature will oscillate about original speed as the mean speed
 motor will become slow.
 armature current will drop
 motor will attain dangerously high speed

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Electrical Machines
In electric locomotive which of the following motor are used ?

  Shunt motor.
  Separately compound motor.
  DC series motor.
  Synchronous motor.

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Electrical Machines
A DC compound motor has

 only series field winding.
 tertiary winding.
 only shunt field winding.
 both shunt and series field winding.

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