Most of the fractional horsepower motors have either___________?
Correct answer: D. plain or sleeve bearings
- A. hard and annealed bearings
- B. ball or roller bearings
- C. soft and porous bearings
- D. plain or sleeve bearings
Explanation
Fractional-horsepower motors commonly use plain or sleeve bearings because they are inexpensive, compact, and adequate for moderate loads. Ball or roller bearings are used where lower friction or heavier service justifies their cost.
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