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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
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.5.
  1.0.
  0.05.

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Electrical Machines
If the excitation is reduced, the power factor is

None of these
 leading power factor
 lagging power factor
 unity power factor

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Transistor series regulator.
  Transistor shunt regulator.
None of these
  Zener diode shunt regulator.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 50 %.
 25 %.
 15 %.
  10 %.

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Electrical Machines
Which machine is used for battery charging?

 Compounded DC generator.
 DC shunt generator.
 DC series generator.
 None of these.

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