A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

more than 6 V

zero

less than 6 V

6 V

more than 6 V

zero

less than 6 V

6 V

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

KhfBm3.

KhfBm.

KhfBm1.6.

Khf2Bm1.6.

KhfBm3.

KhfBm.

KhfBm1.6.

Khf2Bm1.6.

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

any of above methods.

providing damper winding in the rotor pole faces.

designing the motor for adequate synchronizing power.

using a flywheel.

any of above methods.

providing damper winding in the rotor pole faces.

designing the motor for adequate synchronizing power.

using a flywheel.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

power.

torque.

current.

speed.

power.

torque.

current.

speed.

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Electrical Machines
In large sized DC machines the compensating windings are provided to

neutralize voltage induced in coil due to fluctuation of l

None of these

compensate for the decrease in speed due to increase of load.

reduce eddy current losses by providing local short circuits.

neutralize voltage induced in coil due to fluctuation of l

None of these

compensate for the decrease in speed due to increase of load.

reduce eddy current losses by providing local short circuits.

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Electrical Machines
The reduced air gap results in an increase

power factor.

cost of operation.

breaking torque.

starting torque.

power factor.

cost of operation.

breaking torque.

starting torque.

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Electrical Machines

Electrical Machines If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

Electrical Machines In a synchronous motor hunting can be reduced to minimum possible by

Electrical Machines The armature voltage control is considered suitable for a DC motor driven at constant

Electrical Machines In large sized DC machines the compensating windings are provided to

Electrical Machines The reduced air gap results in an increase

Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

Electrical Machines
In large sized DC machines the compensating windings are provided to

Electrical Machines
The reduced air gap results in an increase