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Fan type of loads exhibits which type of load torque characteristics?

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Fan type of loads exhibits which type of load torque characteristics?

(a) Constant torque characteristics

(b) Linearly rising torque characteristics

(c) Non-Linearly rising torque characteristics

(d) Non-Linearly decreasing torque characteristics

I got this question during an online exam.

This intriguing question originated from Dynamics topic in division Dynamics of Electrical Drives of Electric Drives

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Right answer is (c) Non-Linearly rising torque characteristics

Explanation: Torque produced by the fan is directly proportional to square of speed throughout the range of usable fan speeds. This type of loads exhibits non-linearly rising torque characteristics.

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