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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  constant.
  variable.
  maximum.
  minimum.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

  223.V.
 300 V.
 150 V.
 200 V.

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
 starting torque equal to full-load torque.
 high starting torque.
  zero starting torque.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 3000W
 100W
 500W
 1000W

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 4 time the initial value
 1/4 of the intial value
 1/2 of the initial value
 twice the initial value

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Electrical Machines
At stand still condition the value of slip is

 1
 infinite value
 finite value
 0

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MORE MCQ ON Electrical Machines

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