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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 5 Hz
 0 Hz
 1 Hz

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 5
 24
 10
 12

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 polarities are properly connected
 KVA ratings are equal
 turn- ratios are exactly equal
 percentage impedances are equal

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 2.5Hz
 50Hz
 2HZ

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Increases.
 Remain unchanged
 Decreases.
 None of above.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iμ.
 I1 = KI2.
 I1 = KI2 + Iw.

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