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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 power.
 torque.
 speed.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

  600 rpm.
 3000 rpm.
 500 rpm.
 3600 rpm.

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Electrical Machines
The crawling in the induction motor is caused by

 improper design of stator laminations
 harmonics developed in the motor
 low voltage supply
 high loads

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Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
 Induction machine
 DC machine
All of these

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 stator of a induction machine.
 stator of a dc machine.
 rotor of a dc machine.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of cork gaskets used in transformer.
 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.
  condition of paper insulation in transformer.

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