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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Lift.
  Traction.
  Food mixer.
  Domestic pump.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  1 mg of KOH / gm.
 2 mg of KOH / gm.
  0.3 mg of KOH / gm.
 0.5 mg of KOH / gm.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  15 N.
 20 N.
  None of these.
  Can't be determined.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Cumulative compound motor.
  Shunt motor.
  Differential compound motor.
  Series motor.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = 1.
  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = N1 / N2.
  E1 / E2 = f1kw1 / f2kw2.

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Electrical Machines
Which of the following rotor requires damper winding?

 Cylindrical rotor.
 Both type rotor.
 Salient pole rotor.
None of these

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