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Electrical Machines

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

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

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.08 pu.
  0.02 pu.
 0.01 pu.
 0.16 pu.

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Electrical Machines
Commonly used starters of cage motor is

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

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 100W
 500W
 1000W
 3000W

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Electrical Machines
Commutator in DC generator is used for

 increase efficiency
 convert AC armature current in to DC
 reduce losses
 collecting of current

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Electrical Machines
Lap winding is prefered for which type of machines?

 low current and high voltage
 high current and low voltage
 low current and low voltage
 high current and high voltage

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