1

1.Carbon dioxide gas dissolved in boiler wter is dangerous in modern power boiler because the gas is

A.Forms carbonic acid which attacks the waterside

B.Breaks the magnetic iron oxide film inside the boiler tubes

C.Combines with sulfates to cause severe waterside pitting

D.Combines with oxygen to severe waterside scaling

2.The concentrtion of total dissolve solids in the water in a boiler could increase as a result of

A.Infrequent bottom blows

B.Zero water hardness

C.Dissolved oxygen

D.Priming and carryover

3.To minimize metal corrosion, boiler water is best kept

A.Fairly acidic

B.Slightly acidic

C.Neutral

D.Alkaline

4.The flash point of the fuel oil should be used to determine the highest temperature to which the oil may be heated

A.For atomizing

B.For centrifuging

C.In a storage tank

D.In the recirculating line

5.A higher than normal boiler stack temperature usually indicates

A.Dirty fireside

B.Dirty water side

C.Fuel high in sulfur content

D.Incomplete combustion

6.The steam drum air vent is normally opened when cooling down a boiler to

A.Relieve any residual air pressure in the drum

B.Prevent a vacuum from forming in the steam drum

C.Reduce the pressure in the steam drum more rapidly

D.Protect the superheater

7.Pumps normally used fuel oil service is

A.Positive displacement rotary pump

B.Two-stage centrifugal pumps

C.Explosion proof gear pumps

D.Non-vented plunger pumps

8.Which of the significant combustible elements of the fuel oil is a major source of boiler corrosion?

A.Oxygen

B.Sulfur

C.Hydrogen

D.Carbon

9.Failure to remove calcium and magnesium from the feedwater before it reaches the boiler can result in tube

A.Scaling

B.Pitting

C.Scudding

D.Erosion

10.In addition to monitoring flame quality, flame scanners are used in combustion control systems to

A.Regulate the air/fuel ratio controller for more efficient combustion

B.Secure the forced draft fan upon flame failure

C.Automatically opens the fuel oil solenoid valve

D.Secure the fuel oil supply in the event of a flame failure

11.A boiler safety valve must be capable of

A.Remaining open until excess pressure in the steam drum is relieved

B.Remaining open until a preset pressure drop occurs

C.Opening graudally above designated pressure

D.Closing with a chattering motion to free scale deposits from the seats

12.If the low water level alarm sounds on an automatically fired boiler, and the low water cut out fails to function, you must immediately

A.Blow down the gage glass to determine where the water level is

B.Increase the feedwater supply to maintain the water level

C.Start the emergency feedwater injector to restore normal water level

D.Secure the fire to minimize damage to the boiler tubes

13.Which is a correct statement concerning heat transfer

A.Heat is always transferred at a constant rate

B.Heat transfer rate increase as temperature difference increases

C.The rate of heat transfer is not affected by temperature difference

D.The high temperature region is known as a heat sink

14.Before an explosion can occur in the boiler furnace, there must be an accumulation of unburned fuel, sufficient air to form an explosive mixture, and a

A.Space large enough for explosion to occur

B.Ground in the burner ignition electrode

C.High steam demand on the boiler

D.Source of ignition for the explosive mixture

15.Treatment of boiler feedwater for the control of hardness is necessary to prevent

A.Excessive feedwater alkalinity

B.Foaming

C.Carryover

D.Waterside scale deposits

16.The presence of sulfur in the fuel oil will most likely cause

A.A decrease in the ability of the oil to be properly atomized

B.Excessive heat content per unit volume

C.Heavy slag formation in the refractory

D.Corrosion in the fireside of the boiler

17.The purpose of a peep hole in the boiler casing is to

A.Examine condition of the flame

B.Check the operation of the soot blowers

C.Check for excess smoke in the stack

D.Examine the condition of the refractory cone

18.Phosphates are used in the chemical treatment of boiler water to

A.Control alkalinity and control vanadium

B.Convert scale forming salts to relatively harmless sludge

C.Neutralize the effects of hydrogen embrittlement

D.Decrease dissolved oxygen content

19.The end product of reactions occurring when boiler water is chemically treated, remain in the boiler and increase the need for

A.Makeup feed

B.Acid cleaning

C.Boiler blow down

D.Waterside corrosion treatment

20.What is the purpose of chemically treating boiler water?

A.To reduce the formation of scale on the waterside of the boiler

B.To reduce to a minimum corrosion of the boiler metal

C.Reduce foaming and moisture carryover

D.All of the above

21.Dissolved oxygen can be removed from the boiler water by

A.Frequent surface and bottom blow down

B.Dumping and refilling the boiler weekly

C.Passing the water through absorbent filters

D.Treating the water with chemical scavengers

22.High carbon monoxide content in the flue gas of a boiler indicates

A.Complete combustion

B.Too much excess air

C.Incomplete combustion

D.A high carbon content fuel

23.When a boiler water test indicates a pH value of 6, you should

A.Check the deaerator for possible malfunction

B.Begin a continuous boiler blow down

C.Chemically treat to lower the pH to normal level

D.Chemically treat to raise the pH to normal level

24.Highly alkaline boiler water will contribute to the possible problem of

A.Caustic embrittlement

B.Scale formation

C.Calcium carbonate precipitation

D.Sodium sulfite reacting with dissolved oxygen

25.What are the two common gases that dissolved in boiler water and cause corrosion on the internal parts of the boiler?

A.Oxygen and carbon dioxide

B.Oxygen and carbon monoxide

C.Oxygen and ammonia

D.Oxygen and nitrogen

26.An explosion or flareback could occur in teh boiler if

A.Too much excess air is supplied for convention

B.The boiler firing rate exceeded the end point of circulation

C.The fuel being burned is heated to the flash point

D.The fire box is not purged before attempting to light a fire

27.Bunker "C" fuel oil is heated prior to atomization to

A.Increase the heating value

B.Increase its specific gravity

C.Reduce its viscosity

D.Reduce the flash point

28.The lowest temperature at which fuel oil gives off sufficient vapors to burn continuously when ignited is defined as the

A.Burning temperature

B.Auto ignition temperature

C.Flash point

D.Fire point

29.The most corrosive substances in the boiler water are oxygen and

A.Hydrogen sulfide

B.Sulfur dioxide

C.Carbon dioxide

D.Ammonia

30.Combustion control systems on utomatic boilers are designed to prevent immediate burner ignition after a normal, or safety shutdown, in order to allow time for

A.The furnace to be purged

B.Electric charge buildup in the igniter

C.The fuel pump to start

D.The drum level to equalize

31.Oil accumulation in boiler water would

A.Cause foaming and carryover from the boiler

B.Increase the heat transfer rate

C.Prevent acid attack on the boiler tubes

D.Practically eliminate boiler sludge formation

32.The photoelectric cell installed as part of the combustion safety controls of an augomatically fired boiler will

A.Sense light from the burner flame

B.Control the modulating pressure control circuit

C.Open the control circuit upon sensing an intense flame

D.Close the control circuit upon sensing a flame failure

33.Foaming in the boiler water is a result of

A.Carryover

B.Excessive suspended solids

C.Low water level

D.Excessive surface blows

34.Strainers are installed in boiler fuel oil service lines to

A.Absorb contaminants

B.Removes solids

C.Decrease vicosity

D.Absorb water

35.Incomplete combustion due to insufficient air yields an excess amount of

A.Carbon dioxide

B.Carbon monoxide

C.Nitrogen oxide

D.Sulfur dioxide

36.The prcess of breaking up the fuel into fine particles is to ensure good combustion is called

A.Settling

B.Straining

C.Pumping

D.Atomization

37.Dissolved gases are removed from the boiler feedwater because they may cause

A.Condenser vacuum loss

B.Corrosive condition in the boiler

C.False boiler water level

D.Vapor lock in the feed pumps

38.In automated boiler operations a dirty flame scanner will most likely result in

A.Increase fuel oil consumption

B.Securing fuel oil to the burner

C.Load of forced draft air

D.Incomplete purge cycle

39.You should blow down a gauge glass periodically to

A.Remove any sediment from the glass

B.Maintain the proper level in the steam drum

C.Provide water sampler for the second assistant

D.Test the feedwater stop-check valve

40.As the pH of the boiler water approaches zero, the wter becomes increasingly

A.Soft

B.Alkaline

C.Neutral

D.Acidic

41.A scanner installed in modern combustion control system, functions to

A.Cut off the fuel supply when the fire goes out

B.Monitors the stack for soot fires

C.Regulate the fuel oil supply pressure

D.Sample the stack gases

42.Steam line water hammer can best be prevented by

A.Keeping line drained and insulated

B.Replacing all 90 degree elbows with capped tees

C.Always opening steam valves rapidly

D.Keeping steam temperature below saturation point

43.While raising steam on a cold boiler, the air vent is to be closed after

A.The boiler is cut in on the line

B.Steam has formed and all air is vented

C.The economizer drain is closed

D.All burners have been lit and firing normally

44.Deaerator feedwater is to prevent

A.Feed pump damage

B.Corrosion in the boiler

C.Lose of system vacuum

D.All of the above

45.Low stack gas temperature should be avoided in order to reduce the

A.Percentage of carbon monoxide in the stack gas

B.Formation of sulfuric acid

C.Heat loss to the uptake

D.Accumulation of soot

1.In a watertube boiler, the _______ pass(es) throuth the tubes and the _______ pass(es) across the outside surface of the tubes.

A.Water; water

B.Hot gases of combustion; water

C.Water; hot gases of combustion

D.Hot gases of combustion; hot gases of combustion

2.___________ is the amount the pressure in the boiler must be reduced before the safety valve reseats.

A.MAWP

B.Blowdown

C.1,500 psi

D.None of the above

3.Water passes through the tubes of firetube boiler.

A.True

B.False

4.A safety valve should be manually tested when the pressure is about ______% of the normal popping pressure.

A.60

B.70

C.75

D.80

5.Condensate is water that results from steam losing its heat.

A.True

B.False

6.Why should condensate be removed from steam lines?

A.To prevent corrosion

B.To prevent water hammer

C.To prevent sludge

D.To prevent vapor damage

7.Flues are specified by their inside diameter.

A.True

B.False

8.Hot condensate contains less oxygen than cool makeup water.

A.True

B.False

9.A "D" style boiler is a watertube boiler.

A.True

B.False

10.The three most common fuels used in steam production are _________.

A.Natural gas, fuel oil, and kerosene

B.Natural gas, kerosene, and wood

C.Natural gas, fuel oil, and coal

D.Natural gas, wood, and coal

11.The majority of leaks in a firetube boiler occur near the tube ends.

A.True

B.False

12.An HRT boiler is a watertube boiler.

A.True

B.False

13.The range of a pressure gauge on a steam boiler should be ______ the MAWP.

A.1 1/2 to 2 times

B.Not greater than

C.Not less than

D.2.31 times

14.The purpose of a steam trap is to __________.

A.Automatically vent steam from the steam system

B.Prevent condensate from escaping from the steam system

C.Control the steam pressure in the steam system

D.Automatically drain condensate and vent air from the steam system

15.A check valve is a one-way flow valve for fluids.

A.True

B.False

16.Superheaters raise the pressure of steam.

A.True

B.False

17.A safety valve pops open fully and immediately because the valve disc that closes against the seat of the safety valve is made in a two-stage pattern.

A.True

B.False

18.The formula for finding pressure is _____.

A.Pressure = force X area

B.Pressure = (force X area) \ 2

C.Pressure = force \ area

D.Pressure = force \ (area X 2)

19.A(n) _______ is a short bolt brace that passes through the water leg of a boiler.

A.Arm

B.Stay

C.Bracket

D.None of the above

20.A boiler is a closed vessel in which water is transformed into steam under pressure by the application of heat.

A.True

B.False

21.The downcomer tubes in a watertube boiler contain the _______ water.

A.Hotter, rising

B.Hotter, descending

C.Cooler, rising

D.Cooler, descending

22.Any part of the boiler metal that has hot gases of combustion on one side and water on the other side is the heating ______.

A.Plate

B.Surface

C.Unit

D.Element

23.Temperature creats a greater stress than pressure on a boiler shell.

A.True

B.False

24.A nonreturn valve can be opened manually.

A.True

B.False

25.An "A" style boiler is a firetube boiler with a top drum and two bottom mud drums.

A.True

B.False

26.The atmospheric pressure at sea level is ____ psia.

A.7.9

B.12.4

C.14.7

D.15.8

27.There are 8.33 lb of water in 1 cu ft of water.

A.True

B.False

28.One Btu is the amount of heat necessary to raise the temperature of 1 lb of water 1 degree F.

A.True

B.False

29.Diagonal stays are welded in modern boilers but may be riveted in older boilers.

A.True

B.False

30.MAWP stands for __________.

A.Minimum achievable working pressure

B.Maximum achievable working pressure

C.Minimum allowable working pressure

D.Maximum allowable working pressure

31.Superheater tubes must be kept cool by maintaining a sufficient flow of water through the tubes.

A.True

B.False

32.A low-pressure boiler has an MAWP of 15 psi or less.

A.True

B.False

33.Boilers that have more than ____ sq ft of heating surface must have two or more safety valves.

A.500

B.1,000

C.1,500

D.2,500

34.Thermal shock is the stress imposed on the boiler metal by a sudden and drastic change in pressure.

A.True

B.False

35.The badge plate is commonly attached to the ______ of the boiler.

A.Wall

B.Body

C.Door

D.Outside

36.Water can be compressed to 75% of its original volume.

A.True

B.False

37.Gauge pressure is the pressure below atmospheric pressure.

A.True

B.False

38.The safety valve keeps a boiler from exceeding its ________.

A.Pressure limit

B.MAWP

C.Temperature limit

D.Overflow

39.What must be done to prevent damage from vacuum when draining a boiler?

A.Open the common pressure gauge

B.Open the steam valve

C.Open the blowdown valve

D.Open the vent valve

40.Flash steam is formed when water at a high temperature and pressure is released to a lower pressure.

A.True

B.False

41.Welded longitudinal joints are stronger than riveted longitudinal joints.

A.True

B.False

42.Heat always travels from a body at a high temperature toward a body of low temperature.

A.True

B.False

43.A superheater adds Btu to the steam and gives it the capacity to do more work.

A.True

B.False

44.A common pressure gauge uses a _____ tube to create movement of the pointer when pressure is applied.

A.Siphon

B.Bourdon

C.Mercury

D.Thermostatic bellows

45.Water boils at _____ degrees F under normal atmospheric pressure.

A.100

B.144

C.212

D.430

46.Water hammer first damages a steam line at _____ in the piping.

A.Elbows

B.Tees

C.Restrictions

D.All of the above

47._________ administers the application of various approval stamps on boilers, pressure vessels, and safety valves.

A.ASME International

B.The NB

C.The Boiler Inspector

D.None of the above

48.The maximum capacity of a boiler is the ___________.

A.Area of the floor it occupies

B.Volume of water its shell will hold

C.Pounds of steam it will produce in 1 hr at a given pressure and temperature

D.Gallons of water required to produce a given amount of steam at a given pressure and temperature

49.Steam is odorless, colorless, and tasteless.

A.True

B.False

50.Watertube boilers generate steam from a cold start faster than firetube boilers.

A.True

B.False