A synchronous motor is a useful industrial machine due to its property of

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Option D: All of these

Explanation & Concepts:
The correct answer is D (All of these). A synchronous motor is valued in industrial applications for its ability to improve the power factor, maintain a constant speed, and operate at unity power factor, making it versatile and efficient.

Working Principle: A synchronous motor operates at a constant speed, which is determined by the supply frequency and the number of poles in the motor. This is achieved by synchronizing the rotor's magnetic field with the stator's rotating magnetic field, enabling it to improve the overall power factor of the system by compensating for inductive loads.

Key Formulas: $	ext{Speed} = \frac{120f}{P}$ — where $f$ is the frequency and $P$ is the number of poles

Key Points: Synchronous motors can improve the power factor of electrical systems.; They maintain a constant speed regardless of the load.

Advantages: High efficiency under load conditions.; Ability to operate at unity power factor, reducing reactive power.

Disadvantages: Requires a starting mechanism or auxiliary means for startup.; More complex control system compared to induction motors.

Applications: Used in synchronous power generation.; Applied in synchronous motor drives for precise speed control.

Additional Info: Synchronous motors typically operate at higher speeds than induction motors.. Option B states that speed is constant, which is correct but does not encompass the other benefits.

Answer: D is correct — a synchronous motor provides multiple benefits including improved power factor and constant operational speed.

Exam Tip: When studying motors, focus on the differences between synchronous and induction motors regarding operation, efficiency, and applications.

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Option A: Improving the power factor

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Option B: Speed is constant

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Option C: Can always be adjusted to operate at the unity power factor

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