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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 load angle.
 both 1 and 2.
 excitation.
 frequency.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 cos2δ
 cosδ
 sinδ

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both increase
 both decrease
 decrease and increase respectively
 increase and decrease respectively

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
 0.6.
  1.
 0.8.

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Electrical Machines
Armature reaction depends on which of the following?

 power factor of load
 magnitude of load current
None of these
 both 1 and 2

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

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

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MORE MCQ ON Electrical Machines

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