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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 1000 ohms.
 Infinitely large.
  Low.
 around 500 ohms.

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Electrical Machines
Scott connections are used for

 any of the above.
 three phase to two phase transformation.
 three phase to single phase transformation.
 single phase to three phase transformation.

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 both A and B
 constant loss
 variable loss
None of these

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Electrical Machines
At stand still condition the value of slip is

 0
 finite value
 infinite value
 1

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

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

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 340 A.
 570 A.
 250 A.
 440 A.

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