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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 run at normal speed.
 run at lower speed.
 not run.

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Electrical Machines
Select the motor that should not be started on no load?

  Series motor.
 Compound motor.
 Brushless DC motor.
 Shunt motor.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 wet grinders
 tape recorders
 personal computers as cooling fan

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

All of these
 Capacitor start capacitor run motor
 Capacitor start motor
 Resistance split phase motor

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Stator resistance starting.
  Auto transformer starting.
  Direct online starting.
  Rotor resistance starting.

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 2, 3
 1, 4
 2, 4
 1, 3

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