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Electrical Machines

Electrical Machines
Stepper motor is used in

All of these
 traction
 food processing
 computer printers

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmin to Imin
 Vmax to Imin
 Vmin to Imax

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

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

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  uneven air gap.
  poor lubrication.
  overload.
  overheating of winding.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Differential compound motor.
  Shunt motor.
  Cumulative compound motor.
  Series motor.

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MORE MCQ ON Electrical Machines

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