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An important advantages of a synchronous motor over wound round induction motor is that
Its speed may be controlled more easily
Its speed is independent of supply frequency
Its power factor may be varied at will
None of the above
Its power factor may be varied at will
The correct answer is C, as synchronous motors can have their power factor adjusted by varying the excitation of the rotor winding, which allows for more efficient operation within the power system. This flexibility in managing the power factor provides significant advantages in various applications compared to wound rotor induction motors.
The correct answer is C, as synchronous motors can have their power factor adjusted by varying the excitation of the rotor winding, which allows for more efficient operation within the power system. This flexibility in managing the power factor provides significant advantages in various applications compared to wound rotor induction motors.
P=10003VIcos(╧Х)тАЛ тАФ Represents the real power output of a synchronous motor.
S=P+jQ тАФ Represents the complex power of any AC circuit.
Synchronous motors operate at a constant speed that is determined by the supply frequency and the number of poles in the machine, offering the ability to adjust the excitation current. By changing the excitation, the motor can absorb or supply reactive power, thus varying its power factor, which is not possible with induction motors that inherently operate at a lagging power factor.
Synchronous motors can operate at unity, leading, or lagging power factor.
They help in improving the overall power quality in the electrical network.
Ability to control power factor
Higher efficiency at full load conditions
Higher initial cost compared to induction motors
Requires additional components for excitation control
Water pumping plants
Power factor correction systems
Synchronous motors can be used for power factor correction in industrial applications.
Option A is incorrect because the speed control of synchronous motors is less versatile than that of variable frequency drives used with induction motors.
C is correct тАФ Synchronous motors have the unique capability to vary their power factor depending on rotor excitation.
Understand the principles of reactive power management as it applies to various types of motors to excel in both theoretical and practical applications.