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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 12
 5
 10
 24

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

  condition of transformer.
 condition of bushings.
 condition of bushing stud.
 condition of transformer oil.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Air compressors.
 Blowers.
 Centrifugal pumps.
  Conveyers.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 remains same.
 increase.
 Decrease.d
 none of these.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 2 / 3.
  4 / 5.
 5 / 6.
 6 / 7.

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Electrical Machines
Rotor resistance speed control is used in

 squirrel cage induction motor.
 dc shunt motor.
 synchronous motor.
 slip ring induction motor.

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