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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Traction.
  Food mixer.
  Lift.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta or star according to need.
  star.
None of these
  delta.

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Electrical Machines
Which of these types of motor is self starting?

  Poly-phase synchronous machine.
  Poly-phase induction motor.
  Single phase induction motor.
  None of these.

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Electrical Machines
Synchronous reactance of an alternator represents

 a reactance operating at synchronous speed
All of these
 field winding reactance
 armature reactance and leakage reactance

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 1.06
 0.87
 0.96
 0.95

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 160.
  150.
 180.
 170.

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