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Electrical Machines

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

 27°C.
  45°C.
 35°C.
 32°C.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

  5000 - 45000 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 synchronous reactance
 both 1and 2
 excitation
 load angle

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Electrical Machines
In synchronous generator V curve is drawn between

 either of these.
 field current on Y-axis and armature current on X-axis.
 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 2
 1
 4
 8

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

None of these
 either of these
 constant supply voltage V, starting torque Tst decreases
 constant V, Tst increases

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