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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 increase
 decrease
 either increase or decrease
None of these

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 increases with increase in the load torque.
 decreases with increase in the load torque.
 decreases with decrease in the load torque.
 remains constant.

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Electrical Machines
Hysteresis loss will depends on

 f³
 f²
 f1.6
 f

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

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

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 any of above.
 severe sparking.
 rough commutator surface.
 imperfect contact.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

  less than 1 %.
 1.5 %.
 4 %.
  zero.

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