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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  aluminium.
  carbon.
  phosphor bronze.
  stainless steel.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 399 V.
 100 V.
  230.2 V.
 50 V.

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  easy to cast owing to its low melting point and is easily available.
  of low resistivity.
  cheaper in cost.
  lighter in weight.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 60W
 80W
 100W
 40W

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

  13.5 A.
 27 A.
 23 A.
 11.5 A.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 None of above.
 Armature current.
 Field current.
 Line current.

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