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Electrical Machines

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

  variable.
  constant.
  maximum.
  minimum.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
 0.01 pu.
 0.16 pu.
  0.08 pu.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 72°
 18°
 30°
 36°

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Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL/NfL.
 NnL − NfL.

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Electrical Machines
Generators work on the principle of production of

 dynamically and statically induced emf.
 statically induced emf.
 dynamically induced emf.
None of these

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1470 rpm
 1500 rpm
 zero
 30 rpm

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