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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 = 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
Xd = 9.6Ω and Xq = 9Ω
Xd = 8Ω and Xq = 10.8Ω
Xd = 9Ω and Xq = 9.6Ω
Answer
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Related Question
Electrical Machines
Field winding of a DC series motor is usually provided with thick wire
as it carries large load current.
in order to reduce eddy current to provide large flux.
to reduce the insulation of materials.
to provide large flux.
as it carries large load current.
in order to reduce eddy current to provide large flux.
to reduce the insulation of materials.
to provide large flux.
Answer
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Electrical Machines
If the excitation is critical, the power factor of the alternator is
unity power factor.
lagging power factor.
leading power factor.
None of these
unity power factor.
lagging power factor.
leading power factor.
None of these
Answer
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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?
Induction motors.
Universal motors.
Reluctance motors.
Stepper motors.
Induction motors.
Universal motors.
Reluctance motors.
Stepper motors.
Answer
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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be
reduced by 20%
reduced by 10%
increased by 20%
increased by 10%
reduced by 20%
reduced by 10%
increased by 20%
increased by 10%
Answer
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Electrical Machines
Armature resistance control method is also called as-----------?
constant voltage control
constant power control
constant current control
constant torque control
constant voltage control
constant power control
constant current control
constant torque control
Answer
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