Pumps, Bearings, and Turbines

Question 1

1. What reduces wear and can absorb and dissipate heat as well as guide and aid moving parts

Answer 1

Bearings

Question 2

2. How many different types of loads are there, and what are they called?

Answer 2

Radial, thrust or axial, and combination load (occurs when two types are used together).

Question 3

3. What are the two types a principle bearings called?

Answer 3

Plain Bearing (The common bearing used on turbine generators) and rolling element

Question 4

4. What function does a cage serve in a bearing?

Answer 4

Helps to keep steel balls in position, aligned correctly, and maintains separation at a fixed distance from one another.

Question 5

5. What formula defines bearing speed limitation?

Answer 5

dN = The function of shaft diameter (in millimeters), multiplied by the rotation per minute (RPM)…conversion to MM must occur before applying the formula.

Question 6

6. How does a bearing housing support the bearing?

Answer 6

It protects from environmental corrosion, and helps provide accurate shaft alignment, and support for radial and thrust loads. (two types: Pillow block or pedestal and flanged housings)

Question 7

7. In order to extend the life of a bearing?

Answer 7

One must understand the intended application of the bearing to include the load and the speed that will be imposed on it during its operation.

Question 8

8. The external mechanical resistance against which a machine operates against is known as?

Answer 8

Load

Question 9

9. How much new bearings be kept?

Answer 9

New bearings should be kept in original package until they are about to be installed

Question 10

10. Small, new bearings taken from sealed, undamaged packaging need not be cleaned but?

Answer 10

They may be wiped with a solvent, dried, then lightly lubricated just prior to installation.

Question 11

11. What are types of fittings for bearings?

Answer 11

Press fittings or shrink fittings

Question 12

This fit is usually sufficient to ensure no movement between shaft and bearing?

Answer 12

Press Fitting

Question 13

13. What are the two ways a bearing can be heated for installing?

Answer 13

Induction heater or buy electric oven.

Question 14

14. What is a maximum heat that a bearing can be exposed to?

Answer 14

Do not heat above 250 degrees because this may affect bearing hardness.

Question 15

15. The entire assembly that carries the thrust bearings?

Answer 15

Is submerged in a bath of oil.

Question 16

16. Why are bearings important in the machine?

Answer 16

Bearings reduce the amount of friction between moving parts.

Question 17

17. An external mechanical resistance against which a machine must act is also known as?

Answer 17

Load.

Question 18

18. The three types of loads are?

Answer 18

Combination, axial (or thrust), and radial.

Question 19

19. The two main types of bearings are?

Answer 19

Plain and rolling element.

Question 20

20. The function of the cage in rolling element bearings is?

Answer 20

To keep the bearings precisely positioned and aligned.

Question 21

21. Which type of bearing is best suited for heavy duty applications and long spans?

Answer 21

Sleeve bearings

Question 22

22. Define dN?

Answer 22

The formula for computing bearing speed limitation.

Question 23

23. Roller bearings use seals and Shields to?

Answer 23

Keep moisture and contaminants out.

Question 24

24. What are the two basic types of bearing housings?

Answer 24

Pillow block and flanged housings.

Question 25

25. What is a prime consideration when placing a bearing?

Answer 25

The current bearing type.