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 = 9.6Ω and Xq = 9Ω

Xd = 8Ω and Xq = 10.8Ω

Xd = 9Ω and Xq = 9.6Ω

Xd = 10.8Ω and Xq = 8Ω

Xd = 9.6Ω and Xq = 9Ω

Xd = 8Ω and Xq = 10.8Ω

Xd = 9Ω and Xq = 9.6Ω

Xd = 10.8Ω and Xq = 8Ω

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Electrical Machines
How can the synchronous speed of a 3 - ÃŽÂ¦ IM be varied?

By varying supply voltage.

By varying number of poles.

Both (A) and (B).

By varying the supply frequency.

By varying supply voltage.

By varying number of poles.

Both (A) and (B).

By varying the supply frequency.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

40%

60%

38%

68%

40%

60%

38%

68%

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

increases

decreases

None of these

remains unaffected

increases

decreases

None of these

remains unaffected

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Electrical Machines
Regenerative braking is possible in

DC compound motor.

DC shunt motor with armature resistance control.

DC series motor.

DC shunt motor with field weakening control.

DC compound motor.

DC shunt motor with armature resistance control.

DC series motor.

DC shunt motor with field weakening control.

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Electrical Machines
In DC shunt motor if load is increased, the speed

remains constant.

increase proportional.

reduce slightly.

increased slightly.

remains constant.

increase proportional.

reduce slightly.

increased slightly.

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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 How can the synchronous speed of a 3 - ÃŽÂ¦ IM be varied?

Electrical Machines A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

Electrical Machines In a synchronous motor torque or load angle δ ------------- with increase in load

Electrical Machines Regenerative braking is possible in

Electrical Machines In DC shunt motor if load is increased, the speed

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
How can the synchronous speed of a 3 - ÃŽÂ¦ IM be varied?

Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

Electrical Machines
Regenerative braking is possible in

Electrical Machines
In DC shunt motor if load is increased, the speed