hard and annealed bearings
ball or roller bearings
soft and porous bearings
plain or sleeve bearings
Answer is Right!
Answer is Wrong!
The correct answer is: B. ball or roller bearings
Ball and roller bearings are the most common type of bearing used in fractional horsepower motors. They are made of two parts: a raceway and a rolling element. The raceway is a ring that the rolling element rotates on. The rolling element can be a ball or a roller. Balls are round and rollers are cylindrical.
Ball and roller bearings are very efficient and have low friction. They are also very durable and can withstand a lot of wear and tear. These bearings are also very easy to maintain and can be replaced easily.
The other options are incorrect because:
- Hard and annealed bearings are not commonly used in fractional horsepower motors. They are more expensive and not as durable as ball or roller bearings.
- Soft and porous bearings are not commonly used in fractional horsepower motors. They are not as durable as ball or roller bearings and can wear out quickly.
- Plain or sleeve bearings are not commonly used in fractional horsepower motors. They are not as efficient as ball or roller bearings and can generate more heat.