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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  star delta.
  both A and B.
None of these
  DOL.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same frequency
 same prime mover speed
 same voltage magnitude
 same phase sequence

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  disconnecting any one phase.
  transposing any two leads from supply.
  transposing any two leads from slip rings.

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Electrical Machines
On what factors the speed of dc motor depends?

 Applied voltage.
 All of these.
 Field flux.
 Armature current Ia.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at rated load only
 both A and B
 low at light loads only
 low at heavy loads only

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Electrical Machines
In field flux method speed control of DC Motor is

 constant torque drive below the base speed.
 constant power drive above base speed.
 constant hp drive below the base speed.
 constant torque drive above the base speed.

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