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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f1.5.
  f.
 f2.
 f3.

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

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

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 33.3%
 66.3%
 57.7%
 50%

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f²
 f
 V
 V²

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  4000 rpm.
  1500 rpm.
  3000 rpm.
  3600 rpm.

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Electrical Machines
The starting resistance of DC motor is generally

 1000 ohms.
  Low.
 around 500 ohms.
 Infinitely large.

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