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Which of the following is a disadvantage of synchronous ...
Which of the following is a disadvantage of synchronous ...
Particular
Synchronous Motor
Induction Motor
Speed
Constant speed from no load to full load
Speed change with load
Power factor
Can be operated at all power factor
Operate at lagging power factor
Excitation
Required DC excitation at the rotor or filed
No need for excitation
Economy
Economical for speed below 500 RPM
Economical for speed above 600 RPM
Starting
Auxiliary means have to provide for starting
Self-starting
Construction
Complicated
Simple
Starting toque
More
Less
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