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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 2%
 25%
 4%
 5%

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

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

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

All of these
 In case of any sparking they will be less damaged than copper brushes
 They are not hard as copper brush
 They are self lubricating in nature

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Electrical Machines
In a DC Motor 3 point starter is used to

 limit the starting current to a safer value.
 all of above.
 provide protection against Low-Voltage.
 provide overload protection.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable load.
  windage friction.
  variable frequency.
  variable supply voltage.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Power drawn in KVA.
 Gross power.
 Output power at the shaft.
 Power drawn in KW.

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