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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
  45°C.
 27°C.
 32°C.

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Electrical Machines
In DC machine torque depends on which of the following?

 flux (φ)
 both A and B
 armature current (I)
 speed

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

 It is a step angled motor.
 It is a high reluctance motor.
  It is a constant speed motor.
 It is a variable speed motor.

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Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  EIa.
  none of these.
  EbIa.

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

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 lagging power factor.
 any of the above.
 unity power factor.

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MORE MCQ ON Electrical Machines

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