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Electrical Machines
The oscillation in a synchronous motor can be damped out by
providing damper bars in the rotor pole faces.
running the motor on leading power factors.
maintaining constant excitation.
oscillation cannot be damped.
providing damper bars in the rotor pole faces.
running the motor on leading power factors.
maintaining constant excitation.
oscillation cannot be damped.
Answer
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Related Question
Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load
None of these
increases
remains unaffected
decreases
None of these
increases
remains unaffected
decreases
Answer
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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is
123.3 KVA
50 KVA
100 KVA
83.33 KVA
123.3 KVA
50 KVA
100 KVA
83.33 KVA
Answer
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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes
twice the initial value
1/2 of the initial value
1/4 of the intial value
4 time the initial value
twice the initial value
1/2 of the initial value
1/4 of the intial value
4 time the initial value
Answer
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Electrical Machines
If starter is not used with large DC motor for starting, it will
all of above.
draw a starting current many times its rated full load current.
provide execessive voltage drop in line.
damage the armature and commutator.
all of above.
draw a starting current many times its rated full load current.
provide execessive voltage drop in line.
damage the armature and commutator.
Answer
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Electrical Machines
In a star - delta starting of an IM
resistance is inserted in the rotor.
line voltage is 57.7 % of stator voltage.
applied voltage per stator phase is 57.7 % of a line volt
reduced voltage is applied to the stator.
resistance is inserted in the rotor.
line voltage is 57.7 % of stator voltage.
applied voltage per stator phase is 57.7 % of a line volt
reduced voltage is applied to the stator.
Answer
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