Answer & Solution
Answer: Option C
Solution:
Three-phase induction motor is the most common type of AC motor used in industrial and commercial applications.
This is because it has a
simple design,
rugged construction, and requires
low maintenance compared to other motor types.
It operates with a
self-starting torque and provides
high efficiency and
reliability.
Let's break down why the answer is a three-phase induction motor:
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Induction Motors: These are workhorse motors that rely on electromagnetic induction to operate.
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Three-Phase Power: The vast majority of industrial and commercial power distribution systems use three-phase power. This is because it provides more efficient and consistent power delivery.
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Why Three-Phase Induction Motors are Common:
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High Efficiency: They are generally more efficient than single-phase motors, especially in larger sizes.
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High Starting Torque: Many three-phase induction motors have good starting torque, meaning they can easily start under load.
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Reliability: They are robust and have a long lifespan.
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Simplicity: The design is relatively simple, leading to lower manufacturing costs.
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Wide Availability: Due to their widespread use, they are readily available in a wide range of sizes and power ratings.
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Why the other options are less common:
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Single-phase induction motor: These are used where three-phase power isn't available (like in homes) and typically have lower power ratings.
*
Two-phase induction motor: These are rare and have largely been replaced by three-phase systems.
*
Two-phase squirrel-cage motor: The motor is very uncommon nowadays.
In summary: Because three-phase power is the standard for industrial applications, and three-phase induction motors are efficient, reliable, and readily available, they are the most common type of AC motor.
