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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases.
 remains constant.
 decreases
 increases.

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

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

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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

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

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 340 A.
 250 A.
 460 A.
 570 A.

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Electrical Machines
A compound motor has

  tertiary winding.
  both shunt and series field winding.
  only shunt field winding.
  only series field winding.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature voltage.
  Supply voltage.
  Armature current.
  Field excitaion.

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