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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EIa.
  EbIa.
  EbIa2.
  none of these.

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

 Shaded pole motor.
  PSC (permanent split capacitor) motor.
 Split phase motor.
None of these

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.649.
  0.573.
 0.512.
 0.443.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 speed.
 torque.
 power.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 0 KVA
 4 KVA
 6 KVA
 10 KVA

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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.
 0.16 pu.
  0.02 pu.
 0.01 pu.

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