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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased
both power angle and power factor increase
power angle decrease and power factor increase
both power angle and power factor decrease
power angle increase and power factor decrease
both power angle and power factor increase
power angle decrease and power factor increase
both power angle and power factor decrease
power angle increase and power factor decrease
Answer
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Related Question
Electrical Machines
If a DC motor is connected across the AC supply it will
Burn.
Not run.
Run at lower speed.
Run at normal speed.
Burn.
Not run.
Run at lower speed.
Run at normal speed.
Answer
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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is
1.0.
0.05.
0.5.
0.1.
1.0.
0.05.
0.5.
0.1.
Answer
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Electrical Machines
The condition for maximum running torque is
0.5 lagging
R = S.X
zero
0.707 lagging
unity
0.5 lagging
R = S.X
zero
0.707 lagging
unity
Answer
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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 = 9Ω and Xq = 9.6Ω
Xd = 10.8Ω and Xq = 8Ω
Xd = 8Ω and Xq = 10.8Ω
Xd = 9.6Ω and Xq = 9Ω
Xd = 9Ω and Xq = 9.6Ω
Xd = 10.8Ω and Xq = 8Ω
Xd = 8Ω and Xq = 10.8Ω
Answer
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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 an AC source.
to a DC source.
to earth.
in reverse.
to an AC source.
to a DC source.
to earth.
in reverse.
Answer
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