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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 none of these.
 armature.
 core.
  magnetic field poles.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to armature current.
 Proportional to the square of armature current.
  Constant.
 Inversely proportional to armature current.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V/2, I and P/2
 V, I/2 and P/2
 V/2, I/2 and P/4
 V, I and P

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Electrical Machines
If the field winding connection of DC shunt motor is changed

  It will run in opposite direction.
 motor will become slow.
 motor will not run.
 It will run in same direction.

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 iron loss
 copper loss
 mechanical loss

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

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

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