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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?

 10
 5
 24
 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
 RBY
 BYR
 BRY

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

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

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

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

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

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

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