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Electrical Machines
Eg (generated emf) and Eb (back emf) both are
same.
none of above.
changes.
different.
same.
none of above.
changes.
different.
Answer
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Related Question
Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?
Vacuum.
Oil impregnated paper.
Glass.
Mica.
Vacuum.
Oil impregnated paper.
Glass.
Mica.
Answer
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Electrical Machines
Field weakening method is also called as-----------?
constant torque control
constant voltage control
constant current control
constant power control
constant torque control
constant voltage control
constant current control
constant power control
Answer
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Electrical Machines
In case of 3 - Φ IM, plugging means
pulling the motor directly on line without a rotor.
starting the motor on load which is more than the rated load.
locking of rotor due to harmonics.
interchanging two supply phases for quick stopping.
pulling the motor directly on line without a rotor.
starting the motor on load which is more than the rated load.
locking of rotor due to harmonics.
interchanging two supply phases for quick stopping.
Answer
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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be
2.781 Ω.
2.74 Ω.
25.564 Ω.
2.241 Ω.
2.781 Ω.
2.74 Ω.
25.564 Ω.
2.241 Ω.
Answer
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Electrical Machines
which of the following losses are negligible in blocked rotor test?
both A and B
iron loss
mechanical loss
copper loss
both A and B
iron loss
mechanical loss
copper loss
Answer
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