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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 MNA
None of these
 either GNA or MNA

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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 %.
  10 %.
 25 %.
 15 %.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 voltage but not the torque
 torque but not the voltage
 neither the voltage nor the torque
 both the torque and voltage

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Electrical Machines
Copper brushes in DC machine are used

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

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Zero power factor.
 Lagging power factor.
 Unity power factor.
  Leading power factor.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  statically induced voltage.
  dynamically induced voltage.
  reactance voltage.
None of these

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