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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 armature.
  magnetic field poles.
 none of these.
 core.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P²
 T∝ P³
 T is independent of P
 T∝ P

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 Pi/Pc
 (Pi/Pc)2
 Pc/Pi
 √(Pi/Pc)

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ia.
 E = V – IaRa.
  E = V + IaRa.
 E = V + Ra.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 Fmax.
 (1/2)Fmax.
  (3/2)Fmax.
 3Fmax.

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 90o.
 180o.
 0o.
 dependent upon the load.

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