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Electrical Machines
The overall power factor of an on load transformer
is always lagging.
is always unity.
depends on the power factor of the load.
is always leading.
is always lagging.
is always unity.
depends on the power factor of the load.
is always leading.
Answer
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Related Question
Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to
reduce the magnetic hum and locking tendency of rotor.
increase the strength of rotor bars.
decrease the amount of copper to be used.
provide ease of fabrication.
reduce the magnetic hum and locking tendency of rotor.
increase the strength of rotor bars.
decrease the amount of copper to be used.
provide ease of fabrication.
Answer
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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?
15.30%.
18.25%.
16.67%.
14.28%.
15.30%.
18.25%.
16.67%.
14.28%.
Answer
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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.
damping torque.
restoring torque.
synchronizing power co efficient.
mechanical rotatory system.
damping torque.
restoring torque.
synchronizing power co efficient.
mechanical rotatory system.
Answer
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Electrical Machines
The back emf produced in a dc motor depends on
Z.
P.
none of these.
P and Z.
Z.
P.
none of these.
P and Z.
Answer
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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?
Inserting an additional resistance in the field circuit.
Inserting an additional resistance in the armature circuit.
Any of above.
Inserting resistance to armature circuit and field circuit.
Inserting an additional resistance in the field circuit.
Inserting an additional resistance in the armature circuit.
Any of above.
Inserting resistance to armature circuit and field circuit.
Answer
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