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Which of the following is a disadvantage of synchronous motor over induction motor for power requirements from 35 kW up to about 2500 kW?
1. Cost
2. Size
3. Weight
4. Requirement of DC supply for field

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Correct Answer - Option 4 : Requirement of DC supply for field

Comparison between Induction Motor and Synchronous Motor for power range 35 kW to 2500 kW:

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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