need frequent starting and stopping of electric motors ?
Correct answer: D. Lifts and hoists
- A. Paper mills
- B. Grinding mills
- C. Air-conditioners
- D. Lifts and hoists
Explanation
Lifts and hoists repeatedly start, stop, and reverse while handling changing loads, so their motors must tolerate frequent switching and provide strong starting torque. Paper mills, grinding mills, and air-conditioners normally operate more continuously.
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