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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/2.
 PN/3000.
 PN/60.
 PN/120.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  30 Hz.
 35 Hz.
 20 Hz.
  Can be determined.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  negative sequence current.
  all of these.
  less heating of the rotor.

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Electrical Machines
The ventilating ducts in most of DC machine are

 none of these.
 longitudinal.
 radial as well as longitudinal.
 radial.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 150 V.
 240 V.
 220 V.
 280 V.

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Electrical Machines
Which of the following machine will have maximum efficiency?

 Induction motor.
 DC motor.
  Electrical power transformer.
 Electrical power generator.

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MORE MCQ ON Electrical Machines

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