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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 copper.
 mica.
  carbon.
 cast iron.

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Ampere's law.
 Lenz's law.
  Fleming's left hand rule.
 Fleming's right hand rule.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 50, s = 4.43 %.
  P = 20, s = 3.33 %.
  P = 40, s = 5.79 %.
  P = 60, s = 0.96 %.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same phase sequence
 same voltage magnitude
 same prime mover speed
 same frequency

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Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
 rotor reactance X
None of these
 rotor resistance R

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

 decrease
 increase
None of these
 either increase or decrease

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