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Electrical Machines

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

  2 Hz.
 10 Hz.
 50 Hz.
  3 Hz.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 increase and decrease respectively
 both decrease
 decrease and increase respectively
 both increase

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 magnetostriction.
 boo.
  hum.
 zoom.

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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
 both the torque and voltage
 neither the voltage nor the torque

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 differential compound.
 series.
 shunt.
 cumulative compound.

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Electrical Machines
Which machine is used for battery charging?

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

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