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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.5.
  0.05.
  0.1.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

  10°.
 30°.
 45°.
 24°.

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Electrical Machines
The application that need frequent starting and stopping is

  paper mills.
  jaw crushers.
  lifts and hoists.
  blowers.

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 60 V.
 0 V.
 20 V.
 40 V.

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

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

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Electrical Machines
It is advisable to start a DC series motor with some load to

  Limit the speed.
 Avoid sparking.
 Limit the flux.
 Limit the current.

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MORE MCQ ON Electrical Machines

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