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Electrical Machines

Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/3000.
 PN/120.
 PN/2.
 PN/60.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

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

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a almost constant speed.
 Has a poor torque.
 Has its field winding consinting of thick wire and less no of turns.
 Can be started easily without load.

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Electrical Machines
Armature reaction in DC generators will result in

 reduction in generated emf.
 increase in slip.
 open circuit.
 short circuit.

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

  quick acceleration.
 reduced size.
 low starting torque.
 high efficiency.

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Lenz's law.
 Ampere's law.
 Fleming's right hand rule.
  Fleming's left hand rule.

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