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Synchronous Motors
A synchronous machine with low value of short-circuit ratio has
high stability limit
good voltage regulation
lower stability limit
good speed regulation
high stability limit
good voltage regulation
lower stability limit
good speed regulation
Answer
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Related Question
Synchronous Motors
As the load is applied to a synchronous motor, the motor takes more armature current because
The increased load has to take more current
The rotor strengthens the rotating field causing more motor current
The back e.m.f. decreases causing an increase in motor current
The rotor by shifting its phase backward causes motor to take more current
The increased load has to take more current
The rotor strengthens the rotating field causing more motor current
The back e.m.f. decreases causing an increase in motor current
The rotor by shifting its phase backward causes motor to take more current
Answer
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Synchronous Motors
A synchronous capacitor is an over excited motor running at ________
Full load
Half full load
None of the listed here
No load
Full load
Half full load
None of the listed here
No load
Answer
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Synchronous Motors
A synchronous motor delivers reactive power when ______
Under excited
Over excited
Normally excited
None of the listed here
Under excited
Over excited
Normally excited
None of the listed here
Answer
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Synchronous Motors
A synchronous motor runs at only one speed because it ______
None of the listed here
Is a doubly fed machine
Has a damper winding
Has no losses
None of the listed here
Is a doubly fed machine
Has a damper winding
Has no losses
Answer
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Synchronous Motors
When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______
None of the listed here
Coincident with statorbpoles
Mid way between N and S poles of stator
45° (electrical) behind stator poles
None of the listed here
Coincident with statorbpoles
Mid way between N and S poles of stator
45° (electrical) behind stator poles
Answer
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