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Synchronous Motors
A synchronous motor can operate at
Lagging, leading and unity power factors
Lagging power factor only
Leading power factor
Unity power factor only
Lagging, leading and unity power factors
Lagging power factor only
Leading power factor
Unity power factor only
Answer
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Related Question
Synchronous Motors
In a 3-phase synchronous motor, the negative phase sequence exists when the motor is
supplied with unbalanced voltage
over-loaded
under-loaded
None of these
supplied with unbalanced voltage
over-loaded
under-loaded
None of these
Answer
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Synchronous Motors
For power factor correction, synchronous motors operate at
normal load with minimum excitation
no-load and under-excited fields
no-load and greatly over-excited fields
normal load with zero excitation
normal load with minimum excitation
no-load and under-excited fields
no-load and greatly over-excited fields
normal load with zero excitation
Answer
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Synchronous Motors
When a unity pf synchronous motor is operated at a leading pf, it results in _______
Less than rated horsepower output
More than rated horseppwer output
None of the listed here
More than rated rotor current
Less than rated horsepower output
More than rated horseppwer output
None of the listed here
More than rated rotor current
Answer
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Synchronous Motors
Dust and dirt accumulation on motor winding will result in
Increased core losses
Rise in winding temperature
Shorting of coils
Eddy current flow
Increased core losses
Rise in winding temperature
Shorting of coils
Eddy current flow
Answer
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Synchronous Motors
The construction of a synchronous motor ressembles
An induction motor
A rotary converter
An alternator
A series motor
An induction motor
A rotary converter
An alternator
A series motor
Answer
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