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Electrical Machines

Electrical Machines
Slip exists in

  synchronous motor.
  induction motor.
  none of above.
  in both machines.

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Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 DC compound.
 Induction motor.
  DC series.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the input to the prime mover.
 cooling the armature.
  reducing the load voltage.
  increasing the excitation.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  repulsion motor type starting.
  transformer with short-circuited secondary.
  synchronous motor.
  capacitor run IM.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  single phase winding.
  heavy copper or aluminium bars placed in rotor slots.
  three phase winding.
  heavy short-circuited end rings.

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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

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

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