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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 115 V
 460 V
 230 V

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 DC series generator.
 Compounded DC generator.
 None of these.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 zero
 30 rpm
 1470 rpm

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 3 only
 1, 2 and 3
 1, 2, 3 and 4
 1, 3

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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.
  KhfBm1.6.
 Khf2Bm1.6.
 KhfBm.

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 74
 36
 37
 72

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MORE MCQ ON Electrical Machines

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