question

The bottom blowdown on a boiler ___.

answer

removes sludge and sediment from the mud drum

question

Boiler tubes are sized using the ___.

answer

outside diameter

question

A boiler fusible plug is brass or bronze with a core of ___.

answer

tin

question

Spalling in a boiler refers to ___.

answer

hairline cracks in the refractory

question

Boiler horsepower is the evaporation of ___ lb of water/hr from and at a feedwater temperature of 212°F.

answer

34.5

question

A siphon installed between the boiler and the pressure gauge protects the Bourdon tube from___.

answer

steam temperature

question

The pH of the boiler water should be ___.

answer

10 to 11.5

question

The boiler superheater raises the temperature of the ___.

answer

steam leaving the boiler

question

An economizer is used to preheat ___.

answer

feedwater

question

Fires caused by spontaneous combustion would probably start in the ___.

answer

oily waste rags

question

A high suction reading on the fuel oil pressure gauge indicates ___.

answer

dirty strainers

question

The ___ is a secondary means of determining boiler water level.

answer

try cock

question

A(n) ___ is used to measure furnace temperature.

answer

pyrometer

question

The range of a boiler pressure gauge must not be less than ___ times the safety valve setting.

answer

1 ½

question

Boiler feedwater is chemically treated to ___.

answer

prevent formation of scale

question

Pressure gauges are calibrated with a(n) ___.

answer

deadweight tester

question

In a firetube boiler, soot settles on the ___.

answer

inside tube surface

question

Carbon dioxide in the flue gas is a sign of ___ combustion.

answer

complete

question

Carbon monoxide in the flue gas is a sign of ___ combustion.

answer

incomplete

question

___ valves should be used for throttling service.

answer

Globe

question

A gradual increase in chimney temperature indicates ___.

answer

a dirty heating surface

question

The pressure applied on the boiler during a hydrostatic test is ___ times the MAWP.

answer

1 ½

question

Boiler safety valve capacity must be such that the steam pressure can never go higher than ___% above the MAWP.

answer

6

question

As fuel oil is heated, its viscosity is ___.

answer

decreased

question

No. ___ fuel oil has the highest Btu content per gallon.

answer

6

question

T/F All steam boilers must have one or more safety valves.

answer

T

question

T/F An open feedwater heater vents gases to the atmosphere.

answer

T

question

T/F A hydrostatic test will determine whether a steam boiler has sufficient relieving capacity.

answer

F

question

T/F When boilers are set in battery, the main steam stop valves, bottom blowdown valves, and feedwater valves should be locked closed before anyone enters the boiler drums.

answer

T

question

T/F Open and closed feedwater heaters are never used at the same time.

answer

F

question

T/F In an open feedwater heater, the water and steam come into direct contact; in a closed feedwater heater, the water and steam are separated.

answer

T

question

T/F An economizer is a fuel-saving device that reclaims heat from the gases of combustion.

answer

T

question

T/F Soot accumulation on the tubes of a watertube boiler does not affect the efficiency of the boiler.

answer

F

question

T/F Scale protects the boiler heating surfaces.

answer

F

question

T/F Boiler corrosion cannot be prevented as long as water is in contact with metal.

answer

F

question

T/F To prevent water hammer, water should be drained out of all high pressure steam lines

answer

T

question

T/F Dry saturated steam is in a gaseous state.

answer

T

question

T/F Pressure on water does not change the boiling point of the water.

answer

F

question

T/F The stop valve in a boiler feedwater line should have the pump discharge pressure on the top of the valve disc when the valve is closed.

answer

F

question

T/F According to the ASME Code, weighted lever safety valves cannot be used on boilers.

answer

T

question

T/F The interior of the Bourdon tube in a steam pressure gauge is always filled with live steam when it is operating.

answer

F

question

T/F Safety valves on superheaters should be set to open before main safety valves on boilers.

answer

T

question

T/F When air preheaters or economizers are used in a boiler, induced draft is usually employed.

answer

T

question

T/F Waterwalls permit greater heat absorption per cubic foot of furnace volume than refractory walls.

answer

T

question

T/F A steam trap is a device that removes air and condensate without loss of steam.

answer

T

question

T/F Steam traps are only used on high-temperature hot water systems.

answer

F

question

T/F Steam traps are used wherever condensate collects.

answer

T

question

T/F A boiler feedwater pump cannot become steambound.

answer

F

question

T/F In both firetube and watertube boilers, the fire is inside the tubes.

answer

F

question

T/F Foaming can lead to carryover.

answer

T

question

___ makes a pop-type safety valve pop open.

answer

Steam entering the huddling chamber exposing a larger area for the steam pressure to act on

question

Manual testing of the safety valve is accomplished by ___.

answer

pulling the test lever by hand and then releasing it to allow it to "snap" closed

question

The middle try cock should be mounted at the NOWL and, when operated, should blow ___.

answer

a mixture of water and steam

question

To ensure good heat transfer in a watertube boiler, the outside of the tubes are kept clean by ___.

answer

soot blowers

question

To ensure good heat transfer in a firetube boiler, the outside of the tubes are kept clean by ___.

answer

recommended feedwater treatment

question

When economizers are used to heat boiler feedwater, every 10°F rise in feedwater temperature is accompanied by a ___% savings in fuel.

answer

1

question

Proper safety procedure requires that ___ before anyone is allowed to enter the steam and water drum.

answer

the boiler's main steam stop valves, feedwater lines, and bottom blowdown lines be closed, locked, and tagged out

question

Boilers taken off-line for cleaning and inspection may be dumped (emptied) when the ___.

answer

boiler setting is cool enough to enter the firebox

question

___ is necessary to burn the volatile matter in coal more efficiently.

answer

Overfire air

question

The induced draft fan is located between the ___ and ___.

answer

boiler; chimney

question

The flash point of fuel oil is the minimum temperature at which the fuel oil will ___.

answer

flash when exposed to an open flame

question

The fire point of fuel oil is the minimum temperature at which the fuel oil will ___.

answer

burn continually

question

The pour point of fuel oil is the ___ temperature at which fuel oil will ___.

answer

lowest; flow

question

Fuel oil with a low flash point is ___.

answer

dangerous to handle

question

___ dioxide is a major cause of air pollution and is caused by burning fuel oil.

answer

Sulfur

question

In a closed feedwater heater, the steam and water ___.

answer

do not mix

question

The operating range of a steam boiler is controlled by a(n) ___.

answer

operating pressure control

question

Water hammer in steam lines is caused by ___.

answer

condensation in the line

question

A manometer measures ___.

answer

difference in pressure between two points

question

A barometer measures ___.

answer

atmospheric pressure

question

In boiler room work, HRT means ___.

answer

horizontal return tubular

question

The safety valves on the boiler drum and superheater safety valves of a steam boiler are set so that ___.

answer

the superheater safety valve opens first

question

The best time to blow down a boiler is when it is ___.

answer

at its lowest load

question

The frequency of blowing down the boiler can best be determined by ___.

answer

testing the boiler water

question

In most plants, the suggested operating procedure is to blow down the water column and gauge glass ___.

answer

at least once a shift

question

T/F Softened water is used in a boiler to prevent pitting of the boiler metal.

answer

F

question

T/F All firetube boilers are horizontal boilers.

answer

F

question

T/F If the top line to a boiler gauge glass were closed, the water in the glass would rise to the top.

answer

T

question

T/F The boiling point of water is not affected by boiler pressure.

answer

F

question

T/F Priming can be a direct result of maintaining too high a water level in the boiler.

answer

T

question

T/F In the closed feedwater heater, steam and water come into direct contact with each other.

answer

F

question

T/F The automatic nonreturn valve is on the main steam line.

answer

T

question

T/F If a plant has only one boiler, an automatic nonreturn valve is not necessary.

answer

T

question

T/F It is unnecessary to blow down a boiler if proper feedwater treatment is used.

answer

F

question

T/F A high pressure cutoff control can take the place of a safety valve.

answer

F

question

T/F Both stop and check valves must be installed on the boiler feedwater line.

answer

T

question

T/F Try cocks on a water column can be used to determine the water level if the gauge glass is broken.

answer

T

question

T/F Boiler explosions would not occur if all boilers had an MAWP of 15 psi.

answer

F

question

T/F The purpose of safety valves is to protect the boiler from exceeding its MAWP.

answer

T

question

T/F The discharge outlet size of a safety valve must not be restricted or reduced.

answer

T

question

T/F A safety valve discharge line cannot be discharged outside of the boiler room.

answer

F

question

T/F Corrosion of the seat and disc of a safety valve can cause the valve to stick in a closed position.

answer

T

question

T/F In a pop-type safety valve, the huddling chamber is constructed to assist in opening the valve.

answer

T

question

T/F If a safety valve leaks after testing, the valve should be fully opened using the test lever. If the valve continues to leak, the boiler should be removed from the line as soon as possible and the safety valve should be repaired or replaced.

answer

T

question

T/F The low water fuel cutoff control shuts off the fuel to a burner when a low water condition occurs.

answer

T

question

T/F A low water fuel cutoff control should be tested by blowing down the float chamber at least once a shift.

answer

T

question

T/F The water column reduces the turbulence of the water to give a more accurate reading in the gauge glass.

answer

T

question

T/F Boiler blowdown tanks do not require vents because the water is discharged to the sewer.

answer

F

question

T/F Blowing down the water column and gauge glass too frequently can cause a false water level.

answer

F

question

T/F A false water level reading can occur if the water column or gauge glass blowdown valves are not fully closed.

answer

T

question

Boilers that are laid up dry have trays of ___ put in the steam and water drums to absorb moisture.

answer

silica gel

question

To obtain complete combustion of a fuel, ___, ___, ___, and ___ are required.

answer

mixture; atomization; temperature; time

question

Oxygen in the boiler causes ___.

answer

pitting

question

A Ringelmann test is used to ___.

answer

determine smoke density

question

Scale buildup in the tubes of watertube boiler can be removed by ___.

answer

an air- or water-driven turbine

question

According to the ASME Code, when no boiler water analysis is made the boiler should be blown down at least once ___.

answer

every 24 hours

question

When the boiler low water alarm is ringing, the operator should ___.

answer

secure the fires

question

A ¾" blowdown line may be used if the boiler has ___ sq ft of heating surface. (a) more than 100, (b) less than 199, (c) more than 500, or (d) none of the above

answer

none of the above

question

The superheater drain ___ the superheater during startup and shutdown.

answer

establishes a steam flow through

question

An infrared scanner ___.

answer

acts as a flame failure control

question

A furnace explosion can be prevented by ___.

answer

purging after ignition failure

question

A sudden increase in chimney temperature without a corresponding increase in steam demand indicates ___.

answer

a broken baffle

question

A lead sulfide cell, which is used for flame detection, is sensitive to ___.

answer

infrared light

question

An economizer heats ___.

answer

feedwater

question

The air switch, which is located on the forced draft fan housing of a rotary cup burner, ensures ___.

answer

positive draft pressure

question

The Btu content of natural gas is ___ Btu per ___.

answer

100,000; therm

question

Chemicals are added to the boiler water by ___.

answer

the proportional chemical pump

question

The boiler feedwater stop valve is between the ___ and ___.

answer

boiler; check valve

question

A pop-type safety valve is a ___ type.

answer

spring-loaded

question

An economizer is used to heat the feedwater before it enters the boiler by using ___.

answer

gases of combustion as they leave the boiler

question

Tubes in a firetube boiler are ___.

answer

rolled and beaded

question

The bypass damper on an air heater ___.

answer

prevents corrosion at low rating

question

The purge cycle of a combination gas/fuel oil boiler is ___ when burning fuel oil as when burning gas.

answer

the same

question

To test a low water fuel cutoff using an evaporation test, the boiler operator must ___.

answer

secure all of the feedwater going to the boiler

question

A flash tank ___.

answer

recovers low pressure steam

question

T/F A closed boiler room that does not permit the proper flow of outside air to the furnace will have combustion problems.

answer

T

question

T/F An airtight boiler room will prohibit complete combustion.

answer

T

question

T/F Weighted lever-type safety valves can be used on steam boilers that operate at pressures not exceeding 50 psi.

answer

F

question

T/F Steam boilers that are out of service can be laid up wet or dry.

answer

T

question

T/F The dry method of boiler lay-up requires the boiler to be opened and air to be circulated to keep the boiler drums and tubes dry.

answer

F

question

T/F Chemical treatment of the boiler water is not necessary when laying a boiler up wet if the water has been deaerated.

answer

F

question

T/F The flash point of fuel oil is lower than the fire point.

answer

T

question

T/F The fire point of fuel oil is the minimum temperature at which fuel oil burns continuously.

answer

T

question

T/F No. 6 fuel oil burns with a clean flame when it is not heated.

answer

F

question

T/F Poor grades of No. 6 fuel oil can be used quite well with a steam atomizing burner.

answer

T

question

T/F The most common causes of boiler accidents or explosions are low water and insufficient purging of the combustion space.

answer

T

question

T/F A steam pressure gauge is calibrated in pounds per square foot.

answer

F

question

T/F The Bourdon tube of a steam pressure gauge does not have to be protected.

answer

F

question

T/F An increase in chimney temperature indicates soot on the heating surfaces of a boiler.

answer

T

question

T/F Absolute pressure is pressure below the atmospheric pressure.

answer

F

question

T/F The dry pipe separator is in the steam and water drum.

answer

T

question

T/F A dry pipe separator increases the quality of steam leaving a steam boiler.

answer

T

question

T/F Excess air for combustion is indicated by testing for CO2 in the gases of combustion.

answer

F

question

T/F A change in water pressure will change the boiling point of water.

answer

T

question

T/F Boiler tube dimensions are based on the inside diameter of the tube.

answer

F

question

T/F The safety valve on the superheater header should be set to blow before the safety valves on the steam and water drum.

answer

T

question

T/F A globe valve offers less resistance to flow than a gate valve does.

answer

F

question

T/F To control the flow of steam, the gate valve is opened halfway.

answer

F

question

T/F The largest heat loss in a boiler is caused by heat being carried with the gases of combustion to the atmosphere.

answer

T

question

T/F The bottom blowdown valves can be used to lower the boiler steam pressure.

answer

F

question

In a rotary cup burner, atomization is achieved by ___.

answer

the rotary cup and primary air

question

To prevent a vacuum from forming on a boiler that is coming off-line, ___.

answer

open the air cock

question

Staybolts are most commonly found on ___.

answer

firetube boilers

question

When warming up a boiler during cold plant startup, the boiler vent should remain open until the steam pressure reaches approximately ___.

answer

15 psi to 25 psi

question

High pressure boilers equipped with quick-opening and screw-type valves are blown down by opening the ___ valve first and closing it ___.

answer

quick-opening; last

question

A slow-opening valve requires ___ complete turns to be fully opened or closed.

answer

five

question

Overheating of tubes in a watertube boiler is caused by ___ on the ___ of the tubes.

answer

scale; inside

question

The viscosity of fuel oil is the measurement of the ___ in the fuel oil.

answer

internal resistance to flow

question

According to the ASME Code, the maximum size of the boiler bottom blowdown line is ___".

answer

2 ½

question

According to the ASME Code, the setting or adjusting of a boiler safety valve must be done by the ___.

answer

person familiar with the construction, operation, and maintenance of a safety valve

question

According to the ASME Code, any repairs done on a boiler safety valve must be done by the ___.

answer

manufacturer or an authorized representative of the manufacturer

question

Feedwater is treated chemically before it enters the boiler to ___.

answer

change scale-forming salts to a nonadhering sludge

question

Soot blowers are most commonly found ___.

answer

on a watertube boiler

question

A duplex reciprocating feedwater pump operates on the principle that ___.

answer

the steam piston must be 2 to 2 ½ times larger in area that the water piston

question

Complete combustion is defined as burning all fuel using ___.

answer

a minimal amount of excess air

question

When testing the safety valve by hand, ___.

answer

the boiler should be at least 75% of popping pressure before testing

question

The absolute pressure of a steam boiler carrying 160 psig would be ___ psia.

answer

174.7

question

The ___ test is used to test the density of smoke leaving a boiler.

answer

Ringelmann

question

An automatic nonreturn valve is found on the ___.

answer

boiler main steam line between the boiler and the main stop valve

question

A boiler steam pressure of 100 psi with a temperature of 500°F indicates ___.

answer

superheated steam

question

If three boilers are connected to a common header and each boiler is at 100 psi, the master gauge on the header would read ___ psi.

answer

100

question

To aid in the delivery of moisture-free steam, the steam leaves the steam and water drum through the ___.

answer

dry pipe

question

A broken baffle in a watertube boiler causes ___.

answer

a rise in chimney temperature

question

The water column on a high pressure steam boiler ___.

answer

reduces the turbulence of water in the gauge glass

question

Safety valves on high pressure boilers can be tested ___.

answer

by hand or pressure

question

T/F One of the purposes of a bottom blowdown line is to remove impurities from the boiler.

answer

T

question

T/F The main function of a steam trap is to remove air and condensate without the loss of steam.

answer

T

question

T/F A therm of natural gas has 10,000 Btu.

answer

F

question

T/F In a natural draft system, the lower draft reading is obtained at the furnace.

answer

F

question

T/F Burning fuel is a chemical reaction that releases heat.

answer

T

question

T/F The main function of a continuous blowdown system is to lower the total concentration of solids in the boiler.

answer

T

question

T/F The high and low water level alarm floats are components of the boiler feedwater system.

answer

F

question

T/F A calorimeter measures excess air being used for combustion.

answer

F

question

T/F When conducting a hydrostatic test, all safety valves are either gagged or removed and blank flanged, and the pressure is increased to 1 ½ times the MAWP.

answer

T

question

T/F Boiler drum safety valves must open before the superheater safety valve to ensure a backflow.

answer

F

question

T/F The atmospheric pressure at sea level will support a column of mercury approximately 30" high.

answer

T

question

T/F A flow meter integrator totalizes the temperature and pressure of steam.

answer

F

question

T/F Purging a furnace before firing can prevent a furnace explosion.

answer

T

question

T/F Try cocks are not effective above a steam pressure of 250 psi.

answer

T

question

T/F A pyrometer measures the amount of moisture in steam leaving a boiler.

answer

F

question

T/F The forced and induced draft fans on a boiler are the same size and operate at the same speed.

answer

F

question

T/F Three methods of heat transfer are radiation, convection, and conduction.

answer

T

question

T/F The size of a boiler tube is determined by the inside diameter of the tube.

answer

F

question

T/F Superheating steam is impossible at low steam pressures.

answer

F

question

T/F Preheaters heat air for combustion.

answer

T

question

T/F An economizer is a heat exchanger that absorbs heat from the gases of combustion leaving the boiler.

answer

T

question

T/F A desuperheater is only used in low pressure steam plants.

answer

F

question

T/F Safety valves are located on the uppermost part of the steam and water drum and the outlet of the superheater header.

answer

T

question

T/F All boilers are equipped with a water column.

answer

F

question

T/F An adequate supply of air is the only thing needed for good combustion.

answer

F

question

Before laying up a boiler, the boiler operator must ___.

answer

thoroughly clean the fire and water sides

question

If water comes out of the top try cock, the boiler operator must ___.

answer

blow down the boiler

question

If steam comes out of the bottom try cock, the boiler operator must ___.

answer

secure the feedwater and fires to the boiler, allow the boiler to cool slowly, and notify the chief engineer

question

A slowly rising water level in the gauge glass indicates that ___.

answer

the top line is closed or clogged

question

While replacing a broken gauge glass with the boiler under pressure, the water level is checked by ___.

answer

using try cocks

question

If the steam valve to the gauge glass is closed or the top line is clogged, the gauge glass will be ___.

answer

full

question

A scotch marine boiler is a ___ boiler.

answer

firetube

question

According to the ASME Code, a boiler that has more than ___ sq ft of heating surface must have two or more safety valves.

answer

500

question

A(n) ___ test is used to test the relieving capacity of a safety valve.

answer

accumulation

question

An open feedwater heater is located ___.

answer

above the feedwater pump on the suction side

question

A closed feedwater heater is located ___.

answer

between the feedwater pump and the boiler

question

To start a turbine pump, the discharge valve should be ___.

answer

closed

question

When making a hydrostatic test on a boiler, the pressure is ___.

answer

1 ½ times the MAWP

question

The feedwater regulator element is located ___.

answer

at the NOWL

question

At a water temperature of 212°F, 1 BHP is equivalent to the evaporation of ___ lb of water/hour.

answer

34.5

question

The valves located between the boiler and the water column are ___ valves and must be locked and sealed open.

answer

os&y or lever

question

To cut a boiler in on a line equipped with hand-operated main steam stop valves, the steam pressure on the incoming boiler should be ___.

answer

slightly lower than line pressure

question

According to the ASME code, the suggested range of a boiler pressure gauge is ___.

answer

1 ½ to 2 times the safety valve setting

question

The bottom blowdown line of a high pressure watertube boiler is connected to the ___.

answer

mud drum

question

With all of the safety valves popping, the boiler pressure should not go higher than ___.

answer

6% above the MAWP

question

Water polluted with foreign matter causes an increase in ___.

answer

surface tension

question

Boiler waterwalls should be blown down ___.

answer

when the firebox is cool but the boiler still has pressure

question

Before draining a boiler, the operator should ___.

answer

allow the setting to cool

question

A safe maximum water concentration of contaminates in steam generators serving low makeup plants is maintained by ___.

answer

continuous blowdown

question

Pyrometers measure ___.

answer

temperature

question

An automatic nonreturn valve is used with a(n) ___.

answer

boiler

question

A pressure control is sensitive to ___.

answer

pressure

question

A vaporstat control is sensitive to ___.

answer

pressure

question

___ is the difference in pressure between two points of measurement that causes air or gases of combustion to flow.

answer

Draft

question

According to the ASME Code, if a boiler has a MAWP that exceeds 100 psi, the boiler must have ___ blowdown valve(s).

answer

two

question

According to the ASME Code, the minimum size pipe connecting the water column to the boiler is ___".

answer

1

question

Viscosity is the internal resistance of a fluid to flow. No. 6 fuel oil has ___ viscosity.

answer

a high

question

The air-proving switch attached to the housing of a fully automatic rotary cup burner opens when there is ___.

answer

fan failure

question

An evaporation test should be performed ___ to check the low water fuel cutoff control.

answer

monthly

question

The size of bottom blowdown lines can be reduced when ___.

answer

the boiler has under 100 sq ft of heating surface

question

Saturated steam at 200 psi that passes through a reducing valve and is reduced to 20 psi becomes low pressure steam that is ___.

answer

superheated

question

A lead sulfide cell is sensitive to ___.

answer

infrared rays

question

Anthracite coal has a ___ content.

answer

high fixed carbon

question

Bituminous coal has a ___ content.

answer

high volatile

question

For the efficient combustion of pulverized coal, it is necessary to maintain ___.

answer

a high furnace temperature

question

The surface blowdown on a steam boiler is located ___.

answer

at the NOWL

question

When using No. 6 fuel oil, the boiler operator must ___.

answer

heat the fuel oil as it comes from the fuel oil tank

question

The function of the fuel oil burner is to ___.

answer

atomize the fuel oil completely

question

When making a hydrostatic test on a boiler, the safety valves must be ___.

answer

set at 1 ½ times the MAWP

question

In a three-element feedwater regulating system, ___ are measured.

answer

steam flow, feedwater flow, and water level

question

The check valve on the boiler feedwater line ___.

answer

prevents backflow from the boiler into the feedwater line

question

On boilers that have both quick-closing and screw-type blowdown valves, the quick-closing valve must be located ___.

answer

closest to the boiler and followed by the screw-type valve

question

An automatic feedwater regulator ___.

answer

maintains a constant water level

question

Boiler CO2 readings of 12.5% over the fire, 11.5% in the second pass, and 8% at the damper indicate ___.

answer

leaks through the boiler side wall

question

A ___ sensor in a flame scanner senses visible light from the burner.

answer

photocell

question

Boiler water with a pH of 11 is ___.

answer

alkaline

question

Neutral on the pH scale is ___.

answer

7

question

Foaming may be caused by ___.

answer

impurities on the boiler water surface

question

The blowdown line must be protected from ___.

answer

excessive heat, corrosion, or freezing

question

The Bourdon tube in a steam pressure gauge is protected by a ___.

answer

siphon

question

A dry pipe on a boiler ___.

answer

removes moisture from steam

question

Draft is measured with a ___.

answer

manometer

question

Most of the heat is transferred from the fire to the boiler heating surface surrounding the fire by ___.

answer

radiation

question

Scale deposit in an HRT boiler can cause ___.

answer

overheating of the boiler metal

question

A deaerating feedwater heater removes noncondensable gases such as air, free oxygen, and CO2 from the feedwater that can cause ___.

answer

corrosion

question

A steam boiler is blown down to ___.

answer

remove sludge and sediment

question

When checking the water level in a steam boiler with try cocks at the NOWL, ___.

answer

steam and water flow out of the middle try cock

question

The furnace of an HRT boiler is ___.

answer

outside of the boiler shell

question

In a reciprocating feedwater pump, the ___.

answer

steam piston is larger than the water piston

question

A scotch marine boiler has ___.

answer

an internal furnace

question

The tubes in a straight-tube watertube boiler are ___ into drums, headers, or sheets to remain stationary.

answer

expanded and flared

question

A compound pressure gauge indicates ___.

answer

pressure or vacuum

question

Scale on a watertube boiler can be removed by ___.

answer

hydraulic turbine cutters

question

___ coal has the highest amount of fixed carbon.

answer

Anthracite

question

Beginning with the largest size, ___, ___, ___¸and ___ are the grades of anthracite coal.

answer

pea; buckwheat; rice; barley

question

Soot on the inside of boiler tubes is removed by a ___.

answer

wire brush and vacuum cleaner

question

Soot on the outside of boiler tubes is removed by a ___.

answer

soot blower

question

Overheating of tubes on a watertube boiler can be caused by ___.

answer

scale buildup inside the tubes

question

Beginning with the largest size, ___, ___, ___, and ___ are the grades of bituminous coal.

answer

run of mine; lump; nut; slack

question

Steam atomizing burners can be used to burn ___ fuel oil at lower temperatures.

answer

No. 6

question

A Ringelmann chart in a steam generating plant is helpful in determining the ___.

answer

density of the smoke leaving the boiler

question

___ percent of the steam generated in a boiler is used for the steam atomizing burner.

answer

Four

question

Sludge and sediment from the mud drum of a boiler are discharged into ___.

answer

a blowdown tank

question

The atomization of fuel oil in a rotary cup burner is caused by the ___.

answer

rotating cup and primary air

question

A steam-driven reciprocating pump is a ___ pump.

answer

positive-displacement

question

The underfeed stoker in steam plants uses ___.

answer

forced draft

question

A proximate analysis of coal is used to determine the ___.

answer

weight of moisture, fixed carbon, volatile matter, and ash

question

In a closed feedwater heater, the ___.

answer

feedwater pressure is higher than the boiler pressure

question

Condensate is returned to the boiler with the makeup water in the ___.

answer

open feedwater heater

question

Economizers are used in large plants so that ___.

answer

heat from the gases of combustion can be reclaimed

question

In a balanced draft system, the pressure in the furnace is approximately ___.

answer

atmospheric

question

A pyrometer measures ___.

answer

temperature

question

A steam pressure gauge is calibrated in ___ per ___.

answer

pounds, square inch

question

The Orsat analyzer is used to determine the ___.

answer

combustion efficiency

question

Staybolts are most commonly used in ___ boilers.

answer

firetube

question

A stop-and-check valve is installed in the ___.

answer

feedwater line

question

A dry pipe ___.

answer

removes moisture form the steam

question

Smoke is the result of ___.

answer

incomplete combustion

question

In a plant that uses forced draft, the pressure at the base of the chimney is ___ pressure.

answer

below atmospheric

question

The throttling calorimeter determines ___.

answer

the amount of moisture in the steam

question

The try cocks on a water column are used ___.

answer

as a secondary means of determining the water level

question

___ and ___ are used to soften feedwater.

answer

Lime; soda ash

question

An ignition arch is used with a(n) ___ stoker

answer

chain grate

question

A difficulty found when burning pulverized coal is ___.

answer

the formation of slag

question

The superheater header safety valve is set to pop at ___ the steam and water drum safety valves.

answer

a lower pressure than

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