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Electrical Machines

Electrical Machines
Example of double excited machine is

 Synchronous motor.
 DC Shunt Motor
 Both are correct.
None of these

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 infinite value
 any of the above
 maximum
 zero

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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

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

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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
 high loads
 low voltage supply

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting torque becomes low.
 the motor may run away.
 the starting current will be enormously high.
 the motor may not start.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3600 rpm.
  3000 rpm.
  1500 rpm.
  4000 rpm.

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MORE MCQ ON Electrical Machines

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