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Electrical Machines

Electrical Machines
The torque developed in IM is nearly proportional to

  V2.
  1 / V.
  V.
 1 / V2.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 linearised
 hyperbola
 any of the above

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Electrical Machines
DC series motor is best suited for electric traction as

 It runs at very high speed at light load.
 It is cheaper in cost.
  It develops high starting torque.
 It consume less power.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 leading
 zero
 lagging
 unity

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Electrical Machines
The power developed by salient pole synchronous machine is/are

None of these
 power due to saliency or reluctance only
 excitation power only
 both 1 and 2

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia increases and ωm decreses
 both decrese
 both armature current Ia and speed ωm increase
 Ia remains constant but ωm increase

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MORE MCQ ON Electrical Machines

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