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Electrical Machines

Electrical Machines
Compensating winding is placed in the

All of these
 pole shoe
 main field
 armature core

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Electrical Machines
In a synchronous motor electromagnetic power varies

 inversely as applied voltage
 directly as square of applied voltage
None of these
 directly as applied voltage

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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

 6 Ω
 1.9 Ω
 2.2 Ω
 5.7 Ω

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 Eb is zero, but Td is unchanged
 both Eb and Td are unchanged
 both Eb and Td are zero
 Eb is unchanged, but Td is zero

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 Decrease.d
 none of these.
 increase.
 remains same.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed rises.
 improve and the speed falls.
 deteriorate and the speed falls.
 deteriorate and the speed rises.

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