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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T∝ V²
 T ∝ 1/V²
 T ∝ V

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Electrical Machines
Which motor used in Lathe machine?

None of these
  D.C. shunt motor.
  D.C . series motor.
  D.C. cumulative compound motor.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

All of these
  vibrations.
  heating of rotor.
  double frequency currents in the rotor.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 both 1 and 2.
 load angle.
 excitation.
 frequency.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and high voltage
 low current and high voltage
 low current and low voltage
 high current and low voltage

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T is independent of P
 T∝ P²
 T∝ P³
 T∝ P

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