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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?

 24
 10
 5
 12

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

All of these
 BRY
 BYR
 RBY

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Electrical Machines
Which of the following pairs is/are correct?

All of these
 closed slot----- leakage flux is high
 semi closed slot-----leakage flux is moderate
 open slot----- leakage flux is less

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Closed slot type machines.
 Open slot type machines.
 Semi closed slot type machine.
 Any of the above.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Slip ring induction motor.
None of these
 Squirrel cage induction motor.
 Same in both induction motors.

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