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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 32.
 16.
  4.
 8.

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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
 40W
 100W

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 40 A.
 440 A.
 400 A.
 44 A.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 varying the applied voltage.
 varying the speed.
 changing the field excitation.
 changing the load.

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 develop excessive speed and damage itself.
 produce sparking at brushes.
 open fuse or circuit breaker.
 draw too much current.

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

 KhfBm3.
 KhfBm.
  KhfBm1.6.
 Khf2Bm1.6.

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