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Principles of Industrial Measurements > Test 2 > Flashcards

Test 2 Flashcards

(63 cards)

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1
Q

The measurement of how much water the air has absorbed at a given temperature.

A

Relative Humidity

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2
Q

Device used in a cooling tower to keep water from blowing out.

A

Drift Eliminators

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3
Q

___ is a term applied to the horizontal direction that air takes in relationship to the downward flow of water in a cooling tower. ___ is a term applied to the vertical flow of air as it moves through a cooing tower in relationship to the downward flow of water.

A

Cross and Counterflow

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4
Q

What isn’t an objective of water treatment

A

Water Deionization

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5
Q

Heat that can be measured or sensed is referred to as

A

Sensible Heat

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6
Q

The approach to tower is the

A

Change in temperature that exists between water entering and leaving the cooling tower.

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7
Q

Dry bulb temperature is the

A

Air temperature as measured by a dry-bulb thermometer.

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8
Q

The wet bulb temperature is the

A

air temperature as measured by a bulb thermometer covered by a water saturated wick. Takes into account the relative humidity.

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9
Q

A cooling tower is classified by

A

How it produces air flow; mechanical or natural. And how the air flows in relation to the downward flow of water; cross or counter current.

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10
Q

The temperature change that exists between the water leaving the tower and the wet bulb temperature of the air entering the tower.

A

Approach to Tower

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11
Q

A device used in a cooling tower to break up and redirect the flow of falling water.

A

Splash Bars

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12
Q

Vents located on the side of a cooling tower.

A

Louvers

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13
Q

Mechanical draft towers use fans to force air in ( ___ draft) or pull air out ( ____ draft).

A

Forced draft and Induced draft

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14
Q

Air moves through a (forced draft or induced draft) at a higher rate. What happens to the flow rate at the discharge point.

A

Forced, flows-down, 20% efficiency decrease

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15
Q

The measure of how much water the air has absorbed at a given temperature.

A

Relative Humidity

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16
Q

A term applied to fluid flow that is directed into one piece of equipment before exiting and entering another. Example heat exchanger

A

Series Flow

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17
Q

A pipe that even disperses hot water over the fill of a cooling tower.

A

Water distribution header and hot water inlet to cooling tower

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18
Q

A post used to support the framework of a cooling tower.

A

Treated wood column and plastic column.

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19
Q

Hyperbolic towers are primarily designed for service in what industry?

A

Power Plants

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20
Q

A common term used to describe the internal buildup on the surface area of a heat exchanger that results in restricted flow.

A

Fouling

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21
Q

Results when electrochemical reactions occur between metal surfaces and surrounding hot water that results in the gradual wearing away of metal.

A

Corrosion

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22
Q

Sensible heat transfer accounts for ___ to ___ of the cooling effect in a cooling tower.

A

10%-20%

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23
Q

Which tower is most efficient, forced or induced? What happens to the flow rate at the discharge point?

A

Induced, speeds-up, efficiency increases.

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24
Q

The efficiency of a tower is tied to all of the following factors except:

A

Personnel (but not really)

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25
A term applied to fluid flow that is equally distributed to multiple pieces of equipment. Example heat exchanger
Parallel Flow
26
___ draft cooling towers use natural forces to bring air into a cooling tower while ___ draft towers use fans to induce or force air into a tower.
Natural and Mechanical
27
Which hyperbolic tower gets higher air flow; counter-flow, cross-flow?
Cross-flow
28
Which hyperbolic tower is more efficient; counter-flow, cross-flow?
Counterflow
29
A type of boiler that passes hot gases through tubes to heat up and vaporize water.
Fire Tube Boiler
30
A group of gas filled tubes in a natural gas burner.
Spuds
31
A steam trap that operates by opening or closing a bellows as the temperature changes. This movement opens and closes a valve.
Bellows trap
32
A type of steam trap that is controlled by temperature changes.
Thermostatic steam trap
33
A boiler is most closely defined as a
Device used by industry to boil water and produce steam
34
Boiler load is most closely defined as a
Plants demand for steam
35
The steam generating drum is typically operated:
Half Full
36
The downcomer is connected to:
Steam generating drum and mud drum
37
The water make-up system takes its level measurement from the:
Deaerator and steam generating drum.
38
Fans are used in a water tube boiler system to:
Control oxygen flow rate
39
The deaerator has the following flows in and out except:
Steam generating drum (out)
40
The coolest tube in the boiler system is the:
Water make-up
41
The burners in a water tube boiler are surrounded by which tubes:
steam generating tubes
42
Flow moves in the opposite direction in these tubes.
Downcomer and steam generating, Riser and downcomer
43
The steam generating tubes are connected to the:
Mud drom and steam generating drum
44
A boiler utilizes the following furnace design:
Direct fired furnace Firce and water tube Indirect fired furnace
45
The convection section in a fired heater most closely resembles the ___ section in a boiler.
Economizer
46
Steam i used in what 4 applications
Heat exchangers Steam turbine Distilation systems Laminating
47
Used to evenly distribute air and fuel vapors over an ignition source and into a boiler firebox.
Burner
48
A section of the boiler utilized to preheat feed water before it enters the main boiler system.
Economizer section
49
As steam flows from the boiler to the plant it begins to cool. When steam cools it forms ___
Condensation.
50
Slugs of water can damage equipment and lead to a condition known as:
Water Hammer
51
The inlet line to the tower (drum) header.
Downcomer
52
The principle reason water circulation occurs in a water tube boiler is because of:
Natural buoyancy forces
53
The shortest discharges line from the lower (drum) header.
Riser
54
Some processes can not take superheated steam so a process know as ___ is applied to remove the additional heat.
desuperheated steam
55
A steam trap that operates with an upside-down bucket inside a casing. It is effective on condensate and non-condensing vapors.
Inverted bucket trap
56
The lower drum (header)
Mud drum
57
Steam that is removed from the water and heated up to a higher temperature.
Superheated steam
58
A device used to separate liquids from gases and return them to a condensate header.
Steam trap
59
A steam trap that operates with a float that opens a valve as the condensate level rises.
Float trap
60
There is a direct correlation between steam temperature and:
Pressure
61
Super high pressure steam is between:
1000-1200 psig
62
The primary purpose of a condensate recovery system is:
Save money Return water to boiler Remove slugs of water from steam
63
5 operating problems associated with steam generation
``` Tube rupture Soot buildup Loss of water flow Flame impingement Scale and water purity ```

Principles of Industrial Measurements (2 decks)

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