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Electrical Machines

Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v2.
 Bl2v.
 Blv2.
 Blv.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 4.8% and -3.2%
 6% and -4%
 3.2% and -1.6%
None of these

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 3, 4, 5
 1, 2, 5
 2, 3, 6
 2, 4, 5, 6

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

 mechanical loss
 both A and B
 copper loss
 iron loss

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may run away.
 the starting torque becomes low.
 the motor may not start.
 the starting current will be enormously high.

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 equal to core loss.
 less than core loss.
  more than core loss.
 zero.

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