Book 1: Unit 3 - Review: Chapter 11 - 12

Question 1

Two conditions which may occur during warm-up of a cold boiler are smoking and:
Select one:

A. Flame pulsations

B. Flue gas condensation

C. Pressure pulsations

D. Fuel flow surging

E. Very high stack temperatures

Answer 1

B. Flue gas condensation

Question 2

Which of the following is done to prevent excessive stresses of boiler metal due to uneven expansion?
Select one:

A. Warm a boiler up as quickly as possible

B. Open the safety valve slowly during a test

C. Increase the boiler blowdown

D. Warm the boiler up before filling it with water

E. Warm the boiler up as slowly as possible

Answer 2

E. Warm the boiler up as slowly as possible

Question 3

In the circulating method, the acid solution is circulated continuously through the unit at a temperature of about _____ until the cleaning action is completed as shown by tests.
Select one:

A. 100°C (212°F)

B. 77°C (170°F)

C. 120°C (248°F)

D. 50°C (98°F)

E. 65°C (150°F)

Answer 3

E. 65°C (150°F)

Question 4

If maintenance is planned for a hot water boiler, it should be drained:
Select one:

A. With the vent valve closed

B. As soon as possible after removal from service

C. While using cold feedwater to cool it

D. Only after it has cooled down

E. Before it has cooled down

Answer 4

D. Only after it has cooled down

Question 5

Reduced heat transfer through the heating surfaces can be caused by:
Select one:

A. Proper water treatment

B. Soot deposits on the waterside

C. Over firing

D. Improper water treatment

E. Sludge deposits on the fireside

Answer 5

D. Improper water treatment

Question 6

Uneven thermal expansion in a firetube boiler occurs between the:
1. Fire tubes
2. Water tubes
3. Furnace
4. Drum
5. Shell
Select one:

A. 1, 2, 3

B. 1, 3, 5

C. 1, 2, 4

D. 2, 3, 4

E. 3, 4, 5

Answer 6

B. 1, 3, 5

Question 7

When removing a steam boiler from service, the vent valve should be opened at 15-20 kPa in order to:
Select one:

A. Allow water to drain from the drum

B. Maintain the boiler water level at operating level

C. Prevent a vacuum from forming in the boiler

D. Permit draining of the boiler while it is still hot

E. Let the O2 within the boiler escape

Answer 7

C. Prevent a vacuum from forming in the boiler

Question 8

When the fires are out, allow the boiler to cool until the pressure is about _____ and then open the drum vents.
Select one:

A. 15-20 kPa (2-3 psi)

B. 20-35 kPa (3-5 psi)

C. 70-100 kPa (10-15 psi)

D. 35-70 kPa (5-10 psi)

E. 7-35 kPa (1-5 psi)

Answer 8

D. 35-70 kPa (5-10 psi)

Question 9

Before closing manhole and handhole openings:
1. Make sure that the seating surfaces are clean
2. Traces of old gaskets left behind may cause leakage
3. Use old gaskets coated with powdered graphite or a gasket compound
4. Use new gaskets
Select one:

A. 2, 3, 4

B. 1, 2, 3

C. 1, 2, 4

D. 1, 3, 4

E. 2, 3, 4

Answer 9

C. 1, 2, 4

Question 10

Hydrostatic testing of a boiler requires that the pressure be raised to _____ the Maximum Allowable Working Pressure stamped on the boiler.
Select one:

A. 1.0 times

B. 2.0 times

C. 1.5 times

D. 0.5 times

E. 1.25 times

Answer 10

C. 1.5 times

Question 11

In the wet boiler lay up method chemicals are added to bring the boiler water to the required:
Select one:

A. TDS

B. Excess oxygen scavenger level

C. pH

D. Acidity

E. Density

Answer 11

B. Excess oxygen scavenger level

Question 12

Tubes adjacent to sootblowers are examined for signs of _____ due to direct impingement of steam from the blowers.
Select one:

A. Erosion

B. Corrosion

C. Caustic embrittlement

D. Overheating

E. Oxygen pitting

Answer 12

A. Erosion

Question 13

If boiler water level has dropped below the gauge glass during boiler operation, the operator is to:
Select one:

A. Slowly reduce the boiler load

B. Immediately restore water level before shutting off the unit

C. Open the blowdown valves in order to have the low water fuel cut-off trip the unit

D. Shut down, cool, and then inspect the boiler for damage before refilling

E. Contact the boiler inspector immediately

Answer 13

D. Shut down, cool, and then inspect the boiler for damage before refilling

Question 14

Whenever there are signs of a tube leak during boiler operation:
Select one:

A. Reduce the firing rate to the minimum

B. Maintain a steady firing rate

C. Watch that it does not get worse

D. Shut down the boiler immediately

E. Close the stop valve on the steam outlet

Answer 14

D. Shut down the boiler immediately

Question 15

The operating pressure of low-pressure hot water heating boilers varies considerably, it is recommended that the differential between the safety relief valve set pressure and the boiler operating pressure is kept to a minimum of _____ or 25% of the relief valve setting, whichever is greater.
Select one:

A. 69 kPa (10 psi)

B. 6 psi. (40 kPa)

C. 3 psi. (20 kPa)

D. 100 psi. (700 kPa)

E. 15 psi. (100 kPa)

Answer 15

A. 69 kPa (10 psi)

Question 16

Boiler stack temperature is rising due to soot build-up on the boiler tubes. This could:
Select one:

A. Result in condensation forming in the flue gas system

B. Cause a furnace explosion

C. Cause the water level to drop to the trip level

D. Cause foaming of the boiler water

E. Result in a pressure explosion

Answer 16

B. Cause a furnace explosion

Question 17

The maximum operating temperature of a hot water boiler should never exceed
Select one:

A. 121°C (250°F)

B. 77°C (170°F)

C. 150°C (302°F)

D. 50°C (98°F)

E. 120°C (248°F)

Answer 17

A. 121°C (250°F)

Question 18

Should the boilers blower or fan fail the supply of combustion air will cease and the _____ cut-off switch will cut off the power to the fuel valve as soon as the pressure at the blower discharge drops below the minimum safe value.
Select one:

A. Low fuel

B. Low water

C. Low air

D. High air

E. Flame scanner

Answer 18

C. Low air

Question 19

Before a new boiler may be started up it must have:
Select one:

A. A valid inspection certificate

B. An inspection by the manufacturer

C. The permission of the Plant Chief Engineer

D. The permission of the union

E. An inspection by the Fire Commissioner

Answer 19

A. A valid inspection certificate

Question 20

More severe foaming in steam heating boilers is usually controlled by:
Select one:

A. Increasing the intermittent blowdown

B. Decreasing the intermittent blowdown

C. Increasing the continuous blowdown

D. The use of antifoam chemicals

E. Decreasing the continuous blowdown

Answer 20

A. Increasing the intermittent blowdown

Question 21

Standard antifriction bearings normally require lubrication once every _____ year/s.
Select one:

A. 2

B. 1

C. 4

D. 3

E. 5

Answer 21

B. 1

Question 22

When the heating plant has two or more boilers supplying steam to a common steam supply header and one or more boilers are already in operation the _____ during the warm-up period.
Select one:

A. Feedwater stop valve of the boiler that is being started up must be kept open

B. Feedwater valve of the boiler that is being started up must be kept closed

C. Steam vent valve of the boiler that is being started up must be kept open

D. Steam stop valve of the boiler that is being started up must be kept open

E. Steam stop valve of the boiler that is being started up must be kept closed

Answer 22

E. Steam stop valve of the boiler that is being started up must be kept closed

Question 23

During the filling of an empty boiler, a valve that should be open to allow the air to escape is the:
Select one:

A. Boiler stop valve

B. Gauge glass steam valve

C. Boiler drain valve

D. Gauge glass drain valve

E. Boiler vent valve

Answer 23

E. Boiler vent valve

Question 24

Power Engineers (boiler operators) are generally not called upon to make any boiler repairs they are usually done by an experienced:
Select one:

A. Plumber

B. Millwright

C. Carpenter

D. Steam fitter

E. Boilermaker

Answer 24

E. Boilermaker

Question 25

The boiler inhibited acid cleaning method most commonly uses a 5% solution of inhibited _____ acid.
Select one:

A. Hydrochloric

B. Nitric

C. Acetic

D. Sulphuric

E. Carbonic

Answer 25

A. Hydrochloric

Question 26

When a cold, gas-fired boiler is started up, condensation (sweating) may occur to such an extent that it appears that the boiler is leaking. What (if anything) should be done to stop this?
Select one:

A. This condensation will stop after the boiler becomes hot

B. Increase the firing rate to stop the sweating

C. Increase the fuel/air ratio to stop the sweating

D. Decrease the firing rate to stop the sweating

E. Decrease the fuel/air ratio to stop the sweating

Answer 26

A. This condensation will stop after the boiler becomes hot

Question 27

After cleaning, cast-iron boilers should be left completely filled with _____ in order to reduce corrosion.
Select one:

A. Water

B. Light oil

C. A slightly acidic solution

D. A mixture of oil and antifreeze

E. A slightly basic solution

Answer 27

A. Water

Question 28

If damp conditions exist during the idle season, the metal surfaces should be painted with a protective coating such as:
Select one:

A. Fuel oil

B. Light oil

C. Grease

D. Latex paint

E. Oil based paint

Answer 28

B. Light oil

Question 29

Some of the reasons why heating boiler accidents occur are:
Select one:

A. The misconception that no supervision is required for automatically-fired boilers

B. Failure to test the low water fuel cutoff

C. All of the above

D. The inexperience or lack of training of operating personnel

E. Inadequate maintenance of boilers and controls

Answer 29

C. All of the above

Question 30

When a steam boiler has to be taken out of service give it a good blowdown to remove as much sediment as possible stop when the drain runs clear. Refill the boiler to the top of the glass maintaining the boiler water temperature above _____ for about one hour to release all the dissolved gases.
Select one:

A. 121°C (250°F)

B. 77°C (170°F)

C. 85°C (185°F)

D. 50°C (98°F)

E. 120°C (248°F)

Answer 30

C. 85°C (185°F)

Question 31

Leakage of a few drops a minute leakage from the packing gland of circulating pumps is desirable to prevent drying out of packing and:
Select one:

A. Scoring of the shaft

B. Corrosion of the shaft

C. Creating to large a mess

D. Prevent ingress of air

E. Over cooling of the shaft

Answer 31

A. Scoring of the shaft

Question 32

Operating temperatures below _____ of a hot water boiler are often avoided to prevent flue gas condensation.
Select one:

A. 100°C (212°F)

B. 150°C (302°F)

C. 50°C (98°F)

D. 120°C (248°F)

E. 77°C (170°F)

Answer 32

E. 77°C (170°F)

Question 33

Repairs affecting the pressure parts of a boiler may only be made after consultation with and the approval of:
Select one:

A. A qualified welder

B. The Shift Engineer

C. The authorized inspector

D. A Professional Engineer

E. The Chief Engineer

Answer 33

C. The authorized inspector

Question 34

Furnace explosions occur within the furnace or gas passes of the boiler and may be caused by:
Select one:

A. A strong pilot flame

B. Sufficient purge of the furnace before lighting up

C. A sufficient amount of combustion air resulting in complete combustion

D. Failure of the main fuel valve to close when the main burner flame is lost

E. Admission of the fuel to the main burner after the pilot flame or other ignition source is established

Answer 34

D. Failure of the main fuel valve to close when the main burner flame is lost

Question 35

Should the water in the gauge glass of a steam boiler, show a higher than normal level or even climb out of sight the level should be brought back to normal to prevent:
Select one:

A. A pressure component failure

B. Carry-over of the water with the steam

C. A decrease in steam production

D. The boiler water from foaming

E. Producing wet steam

Answer 35

B. Carry-over of the water with the steam

Question 36

A hot water heating system automatic fill valve will:
Select one:

A. Prevent the boiler from tripping on low water level

B. Maintain system pressure, regardless of level

C. Maintain boiler water level at some predetermined value

D. Keep the chemical tanks filled

E. Sense expansion tank level

Answer 36

B. Maintain system pressure, regardless of level

Question 37

Chemicals used for the alkaline boil out of a boiler consist of a combination of which of the following.
1. Sodium hydroxide
2. Sodium sulphite
3. Sodium phosphate
4. Sodium carbonate
5. Sodium chloride
Select one:

A. 2, 3, 4

B. 1, 3, 4

C. 1, 2, 4

D. 2, 3, 4

E. 1, 2, 3

Answer 37

B. 1, 3, 4

Question 38

Although cast iron is a _____ material that cracks relatively easily, it has proven to be a satisfactory material for low-pressure boilers.
Select one:

A. Brittle

B. Strong

C. Malleable

D. Ductile

E. Fragile

Answer 38

A. Brittle

Question 39

When removing a hot water boiler from service open the blow-off or drain valve on the bottom of the boiler to remove any sediment that may have collected stopping when the:
Select one:

A. Low water fuel cutoff activates

B. Boiler is empty

C. Low water level alarm sounds

D. Water level drops below the gauge glass

E. Water runs clear

Answer 39

E. Water runs clear

Question 40

Heavy soot build-up can affect combustion conditions in the furnace and may result in:
Select one:

A. Increased sludge and scale formation

B. Loss of ignition

C. A boiler low water condition

D. A furnace flame out

E. A furnace explosion

Answer 40

E. A furnace explosion