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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
None of these
 above rated speed
 below rated speed

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Decreases.
 Remains unchanged.
 None of above.
  Increases.

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / V2
 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / E2

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Output power at the shaft.
 Power drawn in KW.
 Power drawn in KVA.
 Gross power.

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Low.
  High.
  Equal to 1.
  Same as full load.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 1.96
 0.02, 1.98
 0.04, 0.96
 0.02, 0.98

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