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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very low.
 Very high.
 Zero.
 Normal.

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Electrical Machines
The output indicate on the name plate of any motor is always the

  Output power at the shaft.
 Power drawn in KVA.
 Power drawn in KW.
 Gross power.

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Rotor resistance starting.
  Direct online starting.
  Auto transformer starting.
  Stator resistance starting.

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 0.9103 KW.
  2.73 KW.
 5.46 KW.
 1.644 KW.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs Ia
 Eg vs load current
 Vt vs load current
 Eg vs Ia

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

  1.2.
 1.5.
 1.8.
 1.4.

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