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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is
infinite value
maximum
zero
any of the above
infinite value
maximum
zero
any of the above
Answer
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Related Question
Electrical Machines
Which of the following motors has negative speed regulation?
Both B and C.
Shunt motors.
Differential compound motors.
Series motors.
Both B and C.
Shunt motors.
Differential compound motors.
Series motors.
Answer
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Electrical Machines
In an alternator, voltage drops occurs in
armature resistance and leakage reactance.
armature resistance, leakage reactance and armature reaction.
armature resistance, leakage reactance, armature reaction and earth connection.
armature resistance only.
armature resistance and leakage reactance.
armature resistance, leakage reactance and armature reaction.
armature resistance, leakage reactance, armature reaction and earth connection.
armature resistance only.
Answer
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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is
1.06
0.87
0.95
0.96
1.06
0.87
0.95
0.96
Answer
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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?
It will rotates in reverse direction.
Fail to start.
Either short circuit or open circuit occurs.
It will rotates in normal operation.
It will rotates in reverse direction.
Fail to start.
Either short circuit or open circuit occurs.
It will rotates in normal operation.
Answer
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Electrical Machines
In DC generators brushes are used for
reduce eddy current loss
collecting of current without any sparkings
convert ac armature current in to dc
collecting of voltage
reduce eddy current loss
collecting of current without any sparkings
convert ac armature current in to dc
collecting of voltage
Answer
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