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
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

to earth.

to a DC source.

in reverse.

to an AC source.

to earth.

to a DC source.

in reverse.

to an AC source.

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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

crawling.

cogging.

locking.

plugging.

crawling.

cogging.

locking.

plugging.

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Electrical Machines
The synchronous reactance( Xs) is the

reactance due to leakage flux

reactance either due to armature reaction or leakage flux

combined reactance due to armature reaction and leakage flux

reactance due to armature reaction of the machine

reactance due to leakage flux

reactance either due to armature reaction or leakage flux

combined reactance due to armature reaction and leakage flux

reactance due to armature reaction of the machine

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

increase.

remains constant.

None of these

decrease.

increase.

remains constant.

None of these

decrease.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

90o.

less than 90o.

0o.

Greater than 90o.

90o.

less than 90o.

0o.

Greater than 90o.

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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 If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

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 synchronous reactance( Xs) is the

Electrical Machines In a transformer operating at constant voltage if the input frequency increases, the core loss

Electrical Machines The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

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
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

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 synchronous reactance( Xs) is the

Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of