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Electrical Machines

Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf / 2.
  f / s.
  sf.
  s2.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 10%
 increased by 20%
 increased by 10%
 reduced by 20%

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 generator armature terminal.
 generator field terminal.
 motor field terminal.
 motor armature terminal.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

  Capacitor run type.
 Capacitor start.
 Split phase type.
 Shaded pole type.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 applied voltage V
 V²
 1/V
 1/V²

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 increases
 any of the above
 remains unaffected
 decreases

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MORE MCQ ON Electrical Machines

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