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Troubleshooting > Chapters 10-13 > Flashcards

Chapters 10-13 Flashcards

0
Q

Buildup of material on the internal surfaces of heat exchangers.

A

Fouling

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1
Q

What types of heat transfer does a heat exchanger use?

A

Conduction and Convection

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2
Q 
What is evidence of fouling on a heat exchanger?
A. Increase dP
B. Reduce heat transfer
C. Reduces flow
D. All above
A

D. All above

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3
Q

Floating head heat exchanger allows for ____ expansion.

A

thermal

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4
Q

_____ cooling towers use evaporative cooling, moving heat from the water to the air.
A. Dry
B. Wet

A

B. Wet

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5
Q

The air temperature as measured by a thermometer that takes into account the relative humidity.

A

Wet Bulb Temperature

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6
Q

Temperature difference between water leaving the tower and wet bulb temperature.

A

Approach to Tower

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7
Q 
Water treatment systems are designed to control:
A. Scale on exchanger tubes
B. Algae on the wet deck
C. Wood decay
D. All above
A

D. All above

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8
Q

(T/F) Cooling towers are only single-celled.

A

FALSE. They can be single or multi-celled.

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9
Q

(T/F) Cooling tower pH should be kept between 7.8 and 8.4 (slightly basic)

A

True

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10
Q

Cooling Tower water should be sampled at least once per shift for:
A. dissolved solids (causes scaling)
B. dissolved gases (cause basin to be acidic)
C. microorganisms (ct’s are a good breeding ground)
D. All above

A

D. All above

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11
Q

A _____ is a steam generation system.

A

boiler

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12
Q

What is the most common type of boiler in our industry?
A. Water tube
B. Fire Tube

A

A. Water Tube

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13
Q

(T/F) Circulation is achieved through the difference in the density of hot and cool water.

A

True

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14
Q

Fire brick or castable material that surrounds boilers.

A

Refractory

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15
Q

What types of heat transfer do steam generators/boilers use?

A

Conduction, Convection, Radiation

16
Q

Used to preheat boiler feed water (BFW) in a boiler.

A

Economizer

17
Q

Designed to insulate and reduce heat loss, and to reflect radiant heat back into the firebox.

A

Refractory

18
Q

Steam that is heated to a higher temperature than the boiling point at the control pressure.

A

Superheated steam

19
Q 
A steam drum includes:
A. a water/steam interface
B. BFW inlet
C. Blowdown header
D. All above
A

D. All above

20
Q

One cubic foot of water will occupy _____ cubic feet when converted to steam at atmospheric pressure.

A

1,600

21
Q

Thing put into a natural gas supply to make you aware of a gas leak.

A

Odorant

22
Q 
Device that strips out dissolved oxygen.
A. Stripper
B. Deaerator
C. Plenum
D. Downcomer
A

B. Deaerator

23
Q 
Sloping section of a furnace that has transitions between radiant and convective section.
A. Bridgewall Section
B. Convection Section
C. Shock Bank
D. Stack
A

A. Bridgewall section

24
Q 
Top of the furnace
A. Bridgewall Section
B. Convection Section
C. Shock Bank
D. Stack
A

B. Convection Section

25
Q 
First bank of tubes above radiant section in furnace.
A. Bridgewall Section
B. Convection Section
C. Shock Bank
D. Stack
A

C. Shock Bank

26
Q 
Where the combustion gases in a furnace go out.
A. Bridgewall Section
B. Convection Section
C. Shock Bank
D. Stack
A

D. Stack

27
Q 
Radiant heat account for \_\_\_ % of heat transfer in a furnace.
A. 50-60
B. 60-70
C. 70-80
D. 80-90
A

B. 60-70

28
Q

Most common type of furnace in industry.

A

Cabin Furnace

29
Q

Complete combustion produces two chemicals. What are they?

A

CO2 and H2O

30
Q

The single most important variable affecting efficiency in a furnace.

A

Controlling excess oxygen

31
Q

In a boiler, if the control logic detects that the flame is out, what happens to the fuel?

A

It is shut off

32
Q

Part of furnace that contains the burner and open flames.

A

Firebox

33
Q

Direct contact of the flame with furnace tubes.

A

Flame Impingement

Troubleshooting (4 decks)

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