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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  stainless steel.
  aluminium.
  mild steel.
  cast iron.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 6% and -4%
 3.2% and -1.6%
 4.8% and -3.2%
None of these

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Electrical Machines
The three point starter is used for

  Shunt motor as well as compound motors.
  Shunt, compound and series motor.
  Shunt motor.
  Series motor.

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

 torque.
 current.
 power.
 speed.

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Electrical Machines
Copper brushes in DC machine are used

None of these
 where high voltage and low current.
 in both of above cases.
 where low voltage and high currents are involved.

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 2.781 Ω.
  2.241 Ω.
 25.564 Ω.
 2.74 Ω.

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MORE MCQ ON Electrical Machines

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