A low-pressure steam boiler has a maximum allowable working pressure (MAWP) of up to:  

15 psi

Exam 1 Steam Boilers 

In a fire tube boiler, the heat and gases of combustion pass:

through the tubes

Exam 1 Steam Boilers 

A fire tube boiler may be used:

in high or low pressure plants

Exam 1 Steam Boilers 

Because of the large volume of water, the boiler most likely to cause a boiler explosion is:

a fire tube boiler

Exam 1 Steam Boilers 

A horizontal return tubular (HRT) boiler is:

fire tube boiler

Exam 1 Steam Boilers 

A sudden drop in boiler steam pressure without a corresponding drop in boiler water temperature could result in:

a boiler explosion

Exam 1 Steam Boilers 

The part of a boiler that has the heat and gases of combustion on one side and water on the other side is known as the:

heating surface

Exam 1 Steam Boilers 

The comparison, or ratio, of heat supplied in fuel to heat absorbed by water is defined as:

thermal efficiency 

Exam 1 Steam Boilers 

The steam and water drum of water tube boilers is dished (concave) to eliminate the need for:

stays

Exam 1 Steam Boilers 

Vertical fire tube boilers require:

high ceilings, less floor space and the use of stay bolts

Exam 1 Steam Boilers 

In a water tube boiler, the heat and gases of combustion pass:

around the tubes

Exam 1 Steam Boilers 

The ___________ boiler has a large volume of water in relation to horse power size.

 fire tube

Exam 1 Steam Boilers 

The mudroom is the lowest part of the water side of a: 

water tube boiler

Exam 1 Steam Boilers 

Boiler plates and stay bolts are subject to:

tensile stress

Exam 1 Steam Boilers 

Safety valve connections must be approved by the:

Answer American society of mechanical engineers (ASME) 

Exam 1 Steam Boilers 

The most important fitting on a boiler is the:

safety valve

Exam 2 Steam Boilers & Fittings

To prevent failure from pressure over the MAWP, all steam boilers must be equipped with at least one:

safety valve

Exam 2 Steam Boilers & Fittings

A safety valve will:

prevent the boiler from exceeding its MAWP

Exam 2 Steam Boilers & Fittings

Safety valves are designed to:

pop open

Exam 2 Steam Boilers & Fittings

Super heater safety valves are set to open:

before the main safety valves are opened

Exam 2 Steam Boilers & Fittings

When testing a safety valve by hand, there must be:

at least 75% of the popping pressure

Exam 2 Steam Boilers & Fittings

Any repairs to a safety valve should be done by the:

safety valve manufacturer or manufactures authorized representative

Exam 2 Steam Boilers & Fittings

The setting or adjusting of a safety valve should only be done by the:

qualified person who is familiar with the construction and operation of a safety valve

Exam 2 Steam Boilers & Fittings

If it is necessary to test the relieving capacity of a safety valve:

an accumulation test is put on the boiler

Exam 2 Steam Boilers & Fittings

The relieving capacity of a safety valve is measured in:

pounds of steam per hour capable of discharging under a given pressure

Exam 2 Steam Boilers & Fittings

The main purpose of a water column is to:

reduce turbulence in the gauge glass and to get more accurate reading of the water level in the boiler

Exam 2 Steam Boilers & Fittings

Try cocks are:

a secondary means of determining water level in a boiler

Exam 2 Steam Boilers & Fittings

The water column and gauge glass should usually be blown down:

once a shift

Exam 2 Steam Boilers & Fittings

A steam pressure gauge is calibrated in:

pounds per square inch (PSI)

Exam 2 Steam Boilers & Fittings

A siphon protects the steam pressure gauge from:

high temperature of steam

Exam 2 Steam Boilers & Fittings

The pressure at the base of a vertical foot of water is:

0.433 PSI

Exam 2 Steam Boilers & Fittings

The boiler vent is located at the:

highest part of the steam side of the boiler

Exam 2 Steam Boilers & Fittings

The boiler vent is open when warming up a boiler until:

there is 10 to 15 psi of steam pressure on the boiler

Exam 2 Steam Boilers & Fittings

Saturated steam is steam at:

its corresponding temperature and pressure

Exam 2 Steam Boilers & Fittings

When steam is superheated the:

temperature increases with no increase in pressure

Exam 2 Steam Boilers & Fittings

Soot should be:

removed from boiler tubes for better heat transfer

Exam 2 Steam Boilers & Fittings

Boilers in battery equipped with manhole openings must have ___________ according to the  ASME code.                                                                             

two main steam stop valves

Exam 2 Steam Boilers & Fittings

Main boiler stop valves must be:

os&y gate (outside stem & yoke)

Exam 2 Steam Boilers & Fittings

The ASME Code will allow an automatic non-return valve to be used as a main steam stop valve. If one is used it must be:

installed as close to the shell of the boiler as practical on the main steam line

Exam 2 Steam Boilers & Fittings

The main steam stop valve should be gate valves because they:

offer no restriction to the flow of steam 

Exam 2 Steam Boilers & Fittings

When the boiler is equipped with hand operated, main steam stop valves, to cut the boiler in on the line, the steam pressure on the incoming boiler should be:

slightly lower than line pressure

Exam 2 Steam Boilers & Fittings

When a boiler is being inspected, the two main steam stop valves are:

closed, locked, and tagged 

Exam 2 Steam Boilers & Fittings

During boiler warm-up, to remove any condensate trapped between the two boiler stop valves the:

free blowing drain should be open

Exam 2 Steam Boilers & Fittings

According to the ASME code, boilers operating at 100 psi or over must have:

2 bottom blowdown valves

Exam 2 Steam Boilers & Fittings

When blowing down a boiler equipped with a quick opening valve and a screw type valve, the quick opening valve is:

opened first and closed last

Exam 2 Steam Boilers & Fittings

If a quick opening valve is used as a bottom blowdown valve, it must be located:

between the boiler and the slow opening (screw type) valve

Exam 2 Steam Boilers & Fittings

The maximum size of the bottom blowdown line and the surface blow down line is:

2.5"

Exam 2 Steam Boilers & Fittings

Bottom blowdown lines on a water tube boiler are located on the:

mud drum

Exam 2 Steam Boilers & Fittings

The most accurate means of deciding the frequency of blowdown of a boiler is determined by a:

boiler water analysis 

Exam 2 Steam Boilers & Fittings

Oxygen and other non-condensable gases are separated from the feed water: 

in the open deaerator feed water heater

Exam 3 Boiler Room Systems

 The four systems required to operate a steam boiler are:

steam, feed water, fuel, & draft

Exam 3 Boiler Room Systems

In order to produce 1 pound of steam, it is necessary to evaporate: 

1 pound of water

Exam 3 Boiler Room Systems

Steam that has lost its heat and has turned back into water is:

condensate

Exam 3 Boiler Room Systems

A safe and efficient boiler plant should include __________ pumps.                                                                                   

one steam & one electric feed water 

Exam 3 Boiler Room Systems

On a boiler burning low pressure gas, the volume (amount) of gas burned is controlled by the: 

volume of air passing through the Venturi tube

Exam 3 Boiler Room Systems

On the fuel oil system, the purpose of the duplex strainers on the suction line between the tank and fuel pump is to: 

allow the strainer to be cleaned without securing the boiler

Exam 3 Boiler Room Systems

A draft fan located between the boiler and chimney is used in a: 

induced draft system

Exam 3 Boiler Room Systems

The open feed water heater is located:

 

above the feed water pumps 

Exam 3 Boiler Room Systems

Number ____ fuel oil must be heated in order to be pumped.

6

Exam 3 Boiler Room Systems

Pulverized coal has the consistency of talcum powder so that it: 

can come in closer contact with the oxygen for complete combustion

Exam 3 Boiler Room Systems

Draft is defined as a difference in pressure that causes: 

Air or gasses to flow

Exam 3 Boiler Room Systems

Air is mixed inside the burner register in a: 

high-pressure gas system

Exam 3 Boiler Room Systems

Natural draft is produced by a: 

difference in temperature of a column of gas inside the chimney from a column air outside the chimney

Exam 3 Boiler Room Systems

Pulverized coal is burned in _______ in the furnace.

suspension

Exam 3 Boiler Room Systems

Gas leaks should be located and repaired by a: 

gas company representative

Exam 3 Boiler Room Systems

If a boiler that was online is down because of low steam pressure, the cause is: 

either a flame failure or low-water condition

Exam 3 Boiler Room Systems

When performing a hydrostatic test the pressure on the boiler should be increased to: 

1½  Times the safety valve setting

Exam 3 Boiler Room Systems

A furnace explosion can be caused by: 

an accumulation of combustible gases

Exam 3 Boiler Room Systems

The ASME code requires that boilers be inspected internally and externally every: 

year 

Exam 3 Boiler Room Systems

When someone finds an unsafe condition in a plant, that person should report it to:

 

The immediate supervisor 

Exam 3 Boiler Room Systems

 A fire that is caused by oil, gas, grease, or paint would be classified as a class: 

B fire

Exam 3 Boiler Room Systems

The low-water fuel cut off control should be blown down:

once a shift

Exam 3 Boiler Room Systems

The automatic city water make up valve found on an open feed water heater is used to: 

maintain a water level in the feed water heater if there are insufficient condensate returns 

Exam 4: Steam & Water Accessories

The purpose of a feed water regulator is to: 

maintain a consistent water level in the boiler

Exam 4: Steam & Water Accessories

 The sequence of three numbers found on the data plate attached to a reciprocating feed water pump indicates the: 

diameter of steam piston, diameter of water piston, and length of pump stroke

Exam 4: Steam & Water Accessories

A reciprocating feed water pump must have a safety relief valve located between the: 

 

pump and the discharge valve

Exam 4: Steam & Water Accessories

An economizer is used in large boiler plants to heat: 

Feed water using gases of combustion 

Exam 4: Steam & Water Accessories

Centrifugal feed water pumps can be started with their discharge valves: 

Open or closed

Exam 4: Steam & Water Accessories

 Water temperature that is too high in the open feed water heater could cause: 

The feed water pump to become steam bound  

Exam 4: Steam & Water Accessories

  Water temperature that is too low in the open feed water heater could cause:

 

oxygen pitting in the boiler

Exam 4: Steam & Water Accessories

In a low pressure gas burner, a __________ shuts off the gas supply if a little water condition exists. 

manual reset valve

Exam 5: Fuel Burning Equipment

  An indication of a dirty fuel oil strainer would be ________ across the strainer. 

A large pressure drop 

Exam 5: Fuel Burning Equipment

Duplex strainers are found on ___________ of the fuel oil pump. 

both the suction and discharge sides 

Exam 5: Fuel Burning Equipment

Fuel oil heaters must be used when burning number ____ fuel oil.

 

6

Exam 5: Fuel Burning Equipment

A gas pressure regulator is used to control the: 

desired pressure at the burner

Exam 5: Fuel Burning Equipment

A solenoid valve is a direct acting valve in the gas system and is used: 

as an automatic gas shut off valve 

Blowers are used in high-pressure gas system to: 

supply air for combustion

Exam 5: Fuel Burning Equipment

The air-to-gas ratio is maintained by a: 

Air damper, butterfly valve, modulating motor and linkage

Exam 5: Fuel Burning Equipment

 The gas pressure reducing valve in the low pressure gas system produces the gas pressure to:

 

Zero PSI

Exam 5: Fuel Burning Equipment

Boilers are equipped with a combination gas/fuel oil burner for:  

more flexible operation

Exam 5: Fuel Burning Equipment

 Pulverized coal burns: 

in suspension

Exam 5: Fuel Burning Equipment

 The volume of gas to the burner in a high-pressure gas system is controlled by a:

 

butterfly valve

Exam 5: Fuel Burning Equipment

In order to burn 1 lb of fuel, approximately ______ lb of air is needed. 

15

Exam 6: Draft

Draft is measured in: 

inches or tenths of an inch of a vertical water column

Exam 6: Draft

To reduce the heat loss of flue gas going to the chimney, boilers are equipped with: 

economizers and air heaters

Exam 6: Draft

The amount of draft available in a natural draft system is dependent on the: 

height of the chimney

Exam 6: Draft

The gases of combustion leaving a boiler that has natural draft are controlled by: 

outlet dampers

Exam 6: Draft

 Rank refers to the _______ of the coal. 

degree of hardness

Exam 7: Combustion

 Bituminous coal has a high _______ content. 

volatile

Exam 7: Combustion

Anthracite coal has a high ________ content. 

carbon

Exam 7: Combustion

  _______ coal is the type of coal most likely to have problems with spontaneous combustion when being stockpiled.

 

Bituminous  

Exam 7: Combustion

 Air that controls the combustion efficiency is: 

secondary air

Exam 7: Combustion

Air supply to the burner that is more than the theoretical amount needed to burn fuel is:

 

excess air

Exam 7: Combustion

  Air needed for the combustion of fuel is made up of approximately ____% oxygen and ____% nitrogen. 

21; 79

Exam 7: Combustion

Number ____ fuel oil must be heated to reach the required temperature for combustion. 

6

Exam 7: Combustion

Higher numbered fuel oil's produce ______ lower number fuel oils. 

more BTU per gallon then

 Exam 7: Combustion

 The heating value of a fuel is expressed in: 

British thermal units (BTU)

 Exam 7: Combustion

The on / off pressure control must be connected to the:

highest part of the steam side of the boiler

Exam 8: Combustion Controls

A steam siphon ensures that ______ does not enter the boiler pressure control. 

steam 

Exam 8: Combustion Controls

Mercury-tube pressure control will only be accurate when it is installed: 

in a vertical position

Exam 8: Combustion Controls

The two scales found on the boiler pressure control are used to: 

set the operating steam pressure range of the boiler 

Exam 8: Combustion Controls

The purpose of the boiler modulating pressure control is to:

regulate the high and low firing rates of the burner

Exam 8: Combustion Controls

To eliminate the danger of a furnace explosion deeming start up, the firing sequence must first allow for: 

a pre-purge period

Exam 8: Combustion Controls

The purpose of the scanner is to provide: 

both the pilot & the main flame

Exam 8: Combustion Controls

 The positioning combustion control system used on older boilers cannot function without: 

Air pressure

Exam 8: Combustion Controls

The metering combustion control system is sensitive to changes in: 

steam flow and pressure

Exam 8: Combustion Controls

The positioning combustion control system is sensitive to changes in the: 

steam header 

Exam 8: Combustion Controls

Absolute pressure is equal to: 

gauge pressure plus atmospheric pressure 

Exam 9: Instruments

 A boiler steam pressure gauge should have a range of: 

1&1/2 to 2 times the safety valve setting

Exam 9: Instruments

         The boiler steam pressure gauge must be connected to the _______ of the boiler. 

highest part of the steam side

Exam 9: Instruments

The boiler steam pressure gauge is protected from high temperatures by: 

A siphon

Exam 9: Instruments

 Liquids in a tank maybe measured from a remote location using a: 

pneumercator  

Exam 9: Instruments

   The rotameter flow meter consists of a: 

float in a tapered tube

Exam 9: Instruments

 Boiler water must be conditioned to prevent: 

formation of scale, oxygen pitting, & carryover

Exam 10: Boiler Water Treatment

         Boiler water having high alkalinity could develop: 

caustic embrittlement 

Exam 10: Boiler Water Treatment

 Deposits of calcium and magnesium carbonate on the boiler heating surface cause: 

scale

Exam 10: Boiler Water Treatment

Cracking of the boiler metal along the seams and tube ends is caused by: 

caustic embrittlement 

Exam 10: Boiler Water Treatment

Chemicals added to the boiler water change the scale-forming salts into: 

A non-adhering sludge

Exam 10: Boiler Water Treatment

Oxygen in the boiler will cause: 

pitting of boiler metal

Exam 10: Boiler Water Treatment

 Oxygen present in the boiler water is removed by:

 

heating the feed water and using sodium sulfite 

Exam 10: Boiler Water Treatment

The frequency of blowing down a steam boiler is best ascertained by the: 

daily testing of boiler water

Exam 10: Boiler Water Treatment

Closer control of boiler water chemical concentrations is maintained by: 

continuous blow downs

Exam 10: Boiler Water Treatment

When taking over a shift, the boiler operator must first check: 

 

The water level on all boilers that are on the line by blowing down the water column and gauge glass

Exam 11: Steam Boiler Operation

The low water fuel cut off control can be tested: 

by blowing down the low-water fuel cut off or allowing the water level in the boiler to drop

Exam 11: Steam Boiler Operation

The purpose of a flame failure control is to protect the boiler from:

 

A possible furnace explosion

Exam 11: Steam Boiler Operation

After establishing the proper boiler water level, the burner may be lit after: 

purging the furnace

Exam 11: Steam Boiler Operation

The automatic non-return valve on a boiler being cut in on a line should be open to when the steam pressure on the boiler reaches:

75% to 85% of the line pressure

Exam 11: Steam Boiler Operation

It is good operating procedure to test the safety valve on an incoming boiler by hand: 

before the boiler is cut in on the line

Exam 11: Steam Boiler Operation 

When cutting a boiler in on a line equipped with two hand operated steam stop valves, the pressure on the boiler should be ______ line pressure. 

slightly lower than. (75% to 85%)

Exam 11: Steam Boiler Operation

Boilers equipped with a superheater must be protected during warm-up by: 

keeping the superheater drain valve open until the boiler is cut in on the line

Exam 11: Steam Boiler Operation

Superheaters are prevented from overheating by the circulation of: 

steam

Exam 11: Steam Boiler Operation

 When the steam pressure in the boiler has dropped to 10 psi or 15 psi the ______ should be opened. 

boiler vent 

Exam 11: Steam Boiler Operation

After a boiler has had major repair work made on its steam or water side or has developed a low-water condition, it should be subjected to: 

a hydrostatic test

Exam 11: Steam Boiler Operation

Flame failure controls use a: 

flame scanner

Exam 11: Steam Boiler Operation

If there is a danger of the boiler freezing, the boiler should be laid up: 

completely dry

Exam 11: Steam Boiler Operation

       A low water fuel cut off: 

shuts off the fuel supply

Exam 11: Steam Boiler Operation

A boiler that has experienced a low water condition should be: 

Thoroughly examined for signs of overheating

& Hydrostatic tested

Exam 11: Steam Boiler Operation

       A high water level condition in the boiler can be corrected by using: 

bottom blow down 

Exam 11: Steam Boiler Operation

High pressure steam boilers generally operate at pressures

Above 15 psi and over 6 boiler horsepower

Sample Test

Pressure gauges should never have a range less than

1½ times the safety valve set pressure
Sample Test

After water is blown out of a siphon, why should live steam never be allowed to enter a Bourdin tube?

Live steam will damage the pressure gauge

Sample Test

All of the following are essential to maintain the proper fuel oil pressure with fuel oil accessories EXCEPT

Obtaining the correct difference in pressure inside and outside the boiler.

Sample Test

Which of the following could be dangerous to safe operation of a low pressure boiler?

Adding water to an operating boiler when the water level cannot be seen in the gauge glass tube

Sample Test

Which of the following is best if a low-pressure boiler does not have an air vent?

Vent the boiler with the try cocks

Sample Test

What is the purpose of an evaporation test on a low pressure boiler?

To test the low water cutoff control

Sample Test

Following flame failure, controls must de-energize fuel and ignition circuits

Within 4 seconds

Sample Test

How can an operator prevent damage to the tubes while using a cleaner to remove scale from boiler tubes?

Never allow the cleaner to stay in one place

Sample Test

 In a steam boiler, which of the following should never be placed between the safety relief valve and the boiler?

A shut-off valve

Sample Test

Which of these should be used on live electrical fires?

Class C extinguishers

Sample Test

If certain grades of fuel oil are not preheated properly, they may cause

Poor combustion and high fuel consumption

Sample Test