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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 37
 36
 72
 74

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Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC shunt motor with armature resistance control.
 DC series motor.
 DC compound motor.

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

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

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 240 V.
 280 V.
 220 V.
 150 V.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Decreasing the field current.
 Increasing the armature current.
 Increasing the field current.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and high voltage
 high current and low voltage
 low current and low voltage
 low current and high voltage

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