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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 1.92
 0.08
 -1.92

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Electrical Machines
Which type of motors uses slip rings?

 Synchronous motors
 Induction motors
 Both Synchronous and Induction motor
 DC Shunt Motor

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  slip.
  cogging.
  crawling.
  skewing.

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Electrical Machines
A series motor is efficiently suitable for

 none of these.
 low starting torque operation.
  high starting torque operation.
 constant speed operation.

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Electrical Machines
Voltage regulation can be determined by which of the following?

 Synchronous impedance method.
All of these
 MMf method.
 ZPF method.

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 8+j13 ohms
 3.5+j5.8 ohms
 3.05+j5.08 ohms
 53+j85 ohms

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