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Answer: b
Explanation: The friction and windage loss and a speed of 1500 rpm, it is usually 4-8%
of the watt output. The high values apply to small motors below 180 W.
It appears there might be a misunderstanding or lack of clarity about the specific question you’re asking. Could you provide more details or clarify your question? If you’re asking about why high values (perhaps you’re referring to efficiency, power factors, or another parameter) apply to small motors below 150 W, here’s a general explanation:
Small electric motors, particularly those below 150 Watts, often operate at higher values of certain parameters such as efficiency or power factor under specific conditions or in certain designs due to their construction and intended applications. These motors are designed to perform efficiently at lower power levels, reflecting their use in applications where power demand is minimal but efficiency and reliability are crucial. Factors such as the quality of materials, precision in manufacturing, and the specific design tailored to optimize performance at lower power levels can contribute to higher values in parameters compared to larger motors, which are optimized for different operating conditions and efficiency curves.
b
Explanation: The friction and windage loss and a speed of 1500 rpm, it is usually 4-8% of the watt output. The high values apply to small motors below 180 W.