Pumps, Bearings, and Turbines Flashcards

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

Bearings

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

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

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

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

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4
Q
  1. What function does a cage serve in a bearing?
A

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

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5
Q
  1. What formula defines bearing speed limitation?
A

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

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6
Q
  1. How does a bearing housing support the bearing?
A

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)

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

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.

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

Load

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9
Q
  1. How much new bearings be kept?
A

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

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

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

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11
Q
  1. What are types of fittings for bearings?
A

Press fittings or shrink fittings

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12
Q

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

A

Press Fitting

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

Induction heater or buy electric oven.

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

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

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15
Q
  1. The entire assembly that carries the thrust bearings?
A

Is submerged in a bath of oil.

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16
Q
  1. Why are bearings important in the machine?
A

Bearings reduce the amount of friction between moving parts.

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

Load.

18
Q
  1. The three types of loads are?
A

Combination, axial (or thrust), and radial.

19
Q
  1. The two main types of bearings are?
A

Plain and rolling element.

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

To keep the bearings precisely positioned and aligned.

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

Sleeve bearings

22
Q
  1. Define dN?
A

The formula for computing bearing speed limitation.

23
Q
  1. Roller bearings use seals and Shields to?
A

Keep moisture and contaminants out.

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

Pillow block and flanged housings.

25
Q
  1. What is a prime consideration when placing a bearing?
A

The current bearing type.