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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 70° to 85°
 90°
 0°
 25° to 30°

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Open slot type machines.
 Any of the above.
 Semi closed slot type machine.
 Closed slot type machines.

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Electrical Machines
If the excitation is increased, the power factor is

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

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

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

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 50
 1
 10

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

None of these
 Cross magnetization
 Demagnetization
 Magnetization

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