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Electrical Machines

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

  EIa.
  EbIa2.
  none of these.
  EbIa.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Rotor current.
 Slip.
 Line voltage.
 Running torque.

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Electrical Machines
To avoid formation of grooves in the commutator

  the brushes of opposite polarity should track each other.
  brush position has no effect on the commutator grooving.
 the brushes of same polarity should track each other.
None of these

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 2/P*θmech
 θelec = 4/P*θmech
 θelec = θmech
 θelec = P/2*θmech

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

  0.24 Ω.
 0.78 Ω.
 0.45 Ω.
 0.66 Ω.

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Electrical Machines
Maximum power developed depends on

 reactance
 both 1and 2
 voltage
 load angle

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MORE MCQ ON Electrical Machines

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