Chapters 10-13

Question 0

Buildup of material on the internal surfaces of heat exchangers.

Answer 0

Fouling

Question 1

What types of heat transfer does a heat exchanger use?

Answer 1

Conduction and Convection

Question 2

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

Answer 2

D. All above

Question 3

Floating head heat exchanger allows for ____ expansion.

Answer 3

thermal

Question 4

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

Answer 4

B. Wet

Question 5

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

Answer 5

Wet Bulb Temperature

Question 6

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

Answer 6

Approach to Tower

Question 7

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

Answer 7

D. All above

Question 8

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

Answer 8

FALSE. They can be single or multi-celled.

Question 9

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

Answer 9

True

Question 10

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

Answer 10

D. All above

Question 11

A _____ is a steam generation system.

Answer 11

boiler

Question 12

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

Answer 12

A. Water Tube

Question 13

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

Answer 13

True

Question 14

Fire brick or castable material that surrounds boilers.

Answer 14

Refractory

Question 15

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

Answer 15

Conduction, Convection, Radiation

Question 16

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

Answer 16

Economizer

Question 17

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

Answer 17

Refractory

Question 18

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

Answer 18

Superheated steam

Question 19

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

Answer 19

D. All above

Question 20

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

Answer 20

1,600

Question 21

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

Answer 21

Odorant

Question 22

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

Answer 22

B. Deaerator

Question 23

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

Answer 23

A. Bridgewall section

Question 24

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

Answer 24

B. Convection Section

Question 25

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

Answer 25

C. Shock Bank

Question 26

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

Answer 26

D. Stack

Question 27

``` Radiant heat account for ___ % of heat transfer in a furnace. A. 50-60 B. 60-70 C. 70-80 D. 80-90 ```

Answer 27

B. 60-70

Question 28

Most common type of furnace in industry.

Answer 28

Cabin Furnace

Question 29

Complete combustion produces two chemicals. What are they?

Answer 29

CO2 and H2O

Question 30

The single most important variable affecting efficiency in a furnace.

Answer 30

Controlling excess oxygen

Question 31

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

Answer 31

It is shut off

Question 32

Part of furnace that contains the burner and open flames.

Answer 32

Firebox

Question 33

Direct contact of the flame with furnace tubes.

Answer 33

Flame Impingement