UTB9 Boilers

Question 1

At what temperature Fahrenheit does water reach the boiling point?

Answer 1

212°

Question 2

What is the melting point of a fire-actuated fusible plug filled with an alloy of tin, copper, and lead?

Answer 2

445°F to 450°F

Question 3

The bottom of the inverted bell of the liquid sealed draft gauge is sealed with which substance?

Answer 3

oil or mercury

Question 4

Which method is used to clean out a boiler fouled with grease?

Answer 4

Boiling out

Question 5

What color should the pull chain handle be painted for the center gauge cock?

Answer 5

Green

Question 6

An increase in pressure results in what effect on the boiling point temperature of water?

Answer 6

Increase

Question 7

What is the difference between dry saturated steam and wet statured steam?

Answer 7

Absence of water particles in suspension

Question 8

Which description identifies a water-tube boiler?

Answer 8

Products of combustion surround the tubes through which the water flows.

Question 9

In a water-tube boiler, how are baffles usually arranged?

Answer 9

Directly across the tubes three times prior to being discharged from the
boiler.

Question 10

Which is NOT a type of fire-tube boiler?
A. Horizontal supply tubular
B. Firebox
C. Scotch marine
D. Vertical tube

Answer 10

A. Horizontal supply tubular

Question 11

Which safety device provides added protection against low-water conditions?

Answer 11

Fusible plugs

Question 12

Which type of fire-tube boiler are UTs assigned to operate and maintain more often than any other type?

Answer 12

Horizontal fire-tube

Question 13

Where is the blowdown pipe of a vertical tube boiler attached on the water leg?

Answer 13

Lowest part

Question 14

Gas flows into the horizontal return tubular boiler from what component?

Answer 14

Firebox to rear of boiler

Question 15

Where are the manholes located on a horizontal return tubular boiler?

Answer 15

Upper part of shell

Question 16

What is the position of the air cock prior to firing a cold boiler with no steam pressure?

Answer 16

Open

Question 17

Which piece of equipment facilitates the removal of gases through the stack?

Answer 17

Induced draft fan

Question 18

Which blowdown valve permits the removal of scale and sediments from the water column?

Answer 18

Water column blowdown

Question 19

The fire-actuated plug has a melting point of how many degrees Fahrenheit?

Answer 19

445°F to 450°F

Question 20

Which equipment steadies the water level in the gauge glass through the reservoir capacity of the column?

Answer 20

Water column

Question 21

What are the three lengths associated with the electrode assembly?

Answer 21

High, Low, and Burner cutout

Question 22

What is the purpose of try cocks?

Answer 22

To prove the water level in the boiler

Question 23

How many safety valves are required on a boiler that has more than 500 square feet of heating surface?

Answer 23

2

Question 24

What device on the safety valve is provided to lift the valve from its seat?

Answer 24

Lifting lever

Question 25

A steam injector can lift a stream of water at a temperature of 120°F how many feet?

Answer 25

14 feet

Question 26

(True or False) The water supply should not be hotter than 120°F for the injector to operate.

Answer 26

True

Question 27

What is known as the process of maintaining a difference of pressure between two points in a system?

Answer 27

Pressure regulating

Question 28

Which is NOT a function of the pressure control? A. To control the pressure in the boiler. B. To secure water flow when temperature reaches 500°F. C. To secure the fuel burning equipment when the pressure reaches a predetermined cutout. D. To start fuel burning equipment when the pressure drops to the cut-in point.

Answer 28

B. To secure water flow when temperature reaches 500°F.

Question 29

What are the two settings on the pressure control?

Answer 29

Cut-in point and differential

Question 30

Which method is used to controlling combustion air?

Answer 30

Manually adjusted air damper

Question 31

What is the only means of obtaining the correct ratio of fuel to air?

Answer 31

Setting of air damper

Question 32

In combustion control, what is the normal atomizing pressures in pounds per square inch?

Answer 32

95 and 120 pounds per square inch

Question 33

How many seconds after flame failure will the burner equipment be secured?

Answer 33

4

Question 34

Safety shutdown sequence will commence after how many seconds after pilot flame is not established and confirmed?

Answer 34

7

Question 35

Which meter is used as a guide in controlling the relationship between air required and air actually supplied to burn the fuel?

Answer 35

Combustion air and steam flowmeter

Question 36

What unit of measurement is associated with draft gauges?

Answer 36

Inches of water

Question 37

Which are scale-forming elements?

Answer 37

Precipitates of hardness and silica

Question 38

What type of coating does silica leave behind when it precipitates in boiler feedwater?

Answer 38

Hard glossy

Question 39

What is the most widely used method of treatment of scale?

Answer 39

Alkaline phosphate-tannin

Question 40

Boilers operating at what pressure are normally used for hot-water generation?

Answer 40

15 psi or less

Question 41

``` Which reagent is NOT used in the test for hardness? A. Hardness indicator B. Hardness buffer C. Hardness filter D. Hardness titrating solution ```

Answer 41

C. Hardness filter

Question 42

What function does carbon play in the test for phosphates?

Answer 42

Absorbs the tannin

Question 43

Concentrated stannous chloride should be discarded after how many months after preparation?

Answer 43

2

Question 44

At what temperature, in degrees Farhenheit, should the boiler water sample be for the conduct of the caustic alkalinity without tannin test?

Answer 44

70

Question 45

At what temperature, in degrees Fahrenheit, should the boiler water sample be for the conduct of the caustic alkalinity with tannin test?

Answer 45

160

Question 46

Prior to conducting the sodium sulfite test, to what temperature, in degrees Fahrenheit, should the boiler water sample be cooled?

Answer 46

70

Question 47

When the paper turns orange in the conduct of the pH test, what does this indicate to the operator?

Answer 47

pH is too low

Question 48

(True or False) The lower the concentration of ionizable salts, the greater the conductance of the sample.

Answer 48

False

Question 49

``` Which cleaning method for fire-side boilers is NOT recommended? A. Scraper cleaning B. Wet steam sweating C. Dry steam lancing D. Hot-water washing ```

Answer 49

C. Dry steam lancing

Question 50

When utilizing the hot-water washing method, at what temperature, in degrees Fahrenheit, should the water be?

Answer 50

150

Question 51

How is fireside slag removed from the convection super heaters?

Answer 51

By circulating cold water through the tubes.

Question 52

How is water corrosion reduced?

Answer 52

Maintaining the boiler water alkalinity at proper levels.

Question 53

After a safe shutdown of the boiler, what is required prior to commencing tube cleaning?

Answer 53

Adequate ventilation

Question 54

(True or False) The lower ends of all tubes must be cleaned from the water drum or header.

Answer 54

True

Question 55

``` Which acid is NOT required in chemical cleaning of boilers? A. Boric B. Sulfuric C. Citric D. Sulfamic ```

Answer 55

A. Boric

Question 56

What is the purpose of citric acid?

Answer 56

Removal of boiler waterside deposits.

Question 57

What are the two methods of boiler acid treatments?

Answer 57

Circulation or fill-and-soak

Question 58

``` Which is NOT a neutralizing solution? A. Soda ash B. Trisodium phosphate C. Sodium tripolyphosphate D. Calcium sulfate ```

Answer 58

D. Calcium sulfate

Question 59

When conducting the boiling out method, the temperature of the water in the boiler needs to be at what degree Fahrenheit for at least 24 to 48 hours?

Answer 59

200

Question 60

What is the most common cause of major boiler damage?

Answer 60

Low water

Question 61

How often are blowdown valves opened?

Answer 61

Once daily

Question 62

How often are steam traps tested for correct operation?

Answer 62

Once a month

Question 63

The clearance between the shoulder of a manhole plate and the manhole must not exceed what value?

Answer 63

1/16 inch

Question 64

How often is a hydrostatic test performed on a boiler?

Answer 64

Annually

Question 65

In a hydrostatic test, what is the minimum water temperature of the boiler, in degrees Fahrenheit?

Answer 65

70

Question 66

On boilers where the superheated steam reaches 850°F or higher, what material is the super heater tubes constructed out of?

Answer 66

Carbonmolybdenum steel

Question 67

What tool is used to remove tubes?

Answer 67

Air-powered side-cutting chisel

Question 68

Tubes of 2 inches outside diameter are belled to what minimum distance, in inches?

Answer 68

1/8 but no more than 3/16

Question 69

What is the maximum projection into the drum or header for tubes of 2 inches outside diameter?

Answer 69

7/16 max | 5/16 minimum

Question 70

After the repair of boiler refractories, how many hours must the wall dry with the burner shutters open?

Answer 70

12

Question 71

Plastic requires a baking-out temperature range of what value, in degrees Fahrenheit?

Answer 71

2900°F to 3000°F

Question 72

When should the head gasket be inspected?

Answer 72

Whenever both front and rear doors are opened.

Question 73

How many phases of operation are associated with boiler operation?

Answer 73

7

Question 74

Pre-operating checks are performed at what time of boiler operation?

Answer 74

Before lining up and lighting off

Question 75

During normal operation of the boiler, how many responsibilities does the operator have?

Answer 75

2 maintain proper water level at all times prevent loss of ignition when burning fuel is in suspension

Question 76

At what temperature, in degrees Fahrenheit, should the flue-gas temperature be above the steam-produced temperature?

Answer 76

150

Question 77

How many inches of water should the draft be under normal operating conditions?

Answer 77

0.03 to 0.06

Question 78

When should the drum vent valve be opened during normal operations?

Answer 78

Drum pressure drops to 25 psig

Question 79

At what temperature, in degrees Fahrenheit, can the boiler be emptied?

Answer 79

Below 200

Question 80

How many emergency situations should the operator be aware of when running a boiler?

Answer 80

6 (1) low water (2) high water (3) serious tube failure (4) flarebacks (5) minor tube failure (6) broken gauge glass

Question 81

The boiler operating log is set up on what frequency for logkeeping?

Answer 81

24-hour period divided into three 8-hour shifts OR 24-hour period divided into four 6-hour shifts

Question 82

At shore installations, the handles on pull chains to boiler water gauge cocks are colored; which color is associated with opening water-gauge glass stop valve?

Answer 82

WHITE

Question 83

At shore installations, the handles on pull chains to boiler water gauge cocks are colored; which color is associated with closing water-gauge glass stop valve?

Answer 83

RED

Question 84

At shore installations, the handles on pull chains to boiler water gauge cocks are colored; which color is associated with the top gauge cock?

Answer 84

YELLOW

Question 85

At shore installations, the handles on pull chains to boiler water gauge cocks are colored; which color is associated with the bottom gauge cock?

Answer 85

BLUE

Question 86

What device is used to hold a switch lever in the off position?

Answer 86

Lockout