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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 0.9 lag
 0.2 lag
 unity

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / V2

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 40, s = 5.79 %.
  P = 20, s = 3.33 %.
  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

  In series with the armature winding.
 In parallel with the armature winding.
 In parallel with the field winding.
 As a separate unit.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 963.8 r.p.m.
 4575.4 r.p.m.
 1037.5 r.p.m.
 1130 r.p.m.

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

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

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