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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 50 Ω
 100 Ω
 10 Ω
 0.1 Ω

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Electrical Machines
Which of the following motor has negative speed regulation?

 Shunt motor
 Differential compound motor
 Cumulative compound motors
 Series motor

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 205 V.
 212 V.
 210 V.
  201.02 V.

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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
 2, 3, 4
 2, 3 ,5
 1, 2, 3

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 unity power factor.
None of these
 leading power factor.
 lagging power factor.

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Electrical Machines
Which of the following bearings and their uses are correct

 roller bearings → large machines
 both A and B
 ball bearings → small machines
 neither 1 nor 2

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