The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Xd = 9Ω and Xq = 9.6Ω

Xd = 8Ω and Xq = 10.8Ω

Xd = 10.8Ω and Xq = 8Ω

Xd = 9.6Ω and Xq = 9Ω

Xd = 9Ω and Xq = 9.6Ω

Xd = 8Ω and Xq = 10.8Ω

Xd = 10.8Ω and Xq = 8Ω

Xd = 9.6Ω and Xq = 9Ω

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

harmonics.

resonance.

crawling.

cogging.

harmonics.

resonance.

crawling.

cogging.

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

Series.

Cummulative compound.

Shunt.

Differently compounded.

Series.

Cummulative compound.

Shunt.

Differently compounded.

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Electrical Machines
Damper winding is used to

suppress the hunting.

both 1 and 2.

decrease the load current.

increase the load current.

suppress the hunting.

both 1 and 2.

decrease the load current.

increase the load current.

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

locking.

plugging.

crawling.

cogging.

locking.

plugging.

crawling.

cogging.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

pole core.

under leading pole tip.

under trailing pole tip.

under the interpole.

pole core.

under leading pole tip.

under trailing pole tip.

under the interpole.

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Electrical Machines

Electrical Machines The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Electrical Machines In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

Electrical Machines For same HP rating and full load speed which of following motor has poor starting torque?

Electrical Machines Damper winding is used to

Electrical Machines An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

Electrical Machines The flux is maximum in the following part of a DC motor:

Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

Electrical Machines
Damper winding is used to

Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

Electrical Machines
The flux is maximum in the following part of a DC motor: