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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 MNA
 GNA
 either GNA or MNA

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Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 cross magnetization
 demagnetization
 magnetization

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 decrease
 remain nearly constant
 increase gradually and then stay at rated voltage

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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?

  201.02 V.
 212 V.
 210 V.
 205 V.

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 power due to saliency or reluctance only
 both 1 and 2
 excitation power only
None of these

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 2.2 Ω
 6 Ω
 5.7 Ω
 1.9 Ω

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