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Electrical Machines

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

  lagging.
 leading.
 unity.
 zero.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T is independent of P.
 T ∝ √P.
 T ∝ P.
 T2 ∝ P3.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 non-sinusoidal nature of armature mmf
 component of armature mmf along field axis
 magnetic saturation in half of the field pole

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
 45.
  270.
 180.

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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

 100W
 3000W
 1000W
 500W

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  magnetizing electric current and back emf.
  the supply voltage and the back emf.
None of these
  the rotating stator flux and rotor flux.

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