boiler exam study guide 2

question

removes sludge and sediment from the mud drum
answer

The bottom blowdown on a boiler ___.
question

outside diameter
answer

Boiler tubes are sized using the ___.
question

tin
answer

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

hairline cracks in the refractory
answer

Spalling in a boiler refers to ___.
question

34.5
answer

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

steam temperature
answer

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

10 to 11.5
answer

The pH of the boiler water should be ___.
question

steam leaving the boiler
answer

The boiler superheater raises the temperature of the ___.
question

feedwater
answer

An economizer is used to preheat ___.
question

oily waste rags
answer

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

dirty strainers
answer

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

try cock
answer

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

pyrometer
answer

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

1 ½
answer

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

prevent formation of scale
answer

Boiler feedwater is chemically treated to ___.
question

deadweight tester
answer

Pressure gauges are calibrated with a(n) ___.
question

inside tube surface
answer

In a firetube boiler, soot settles on the ___.
question

complete
answer

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

incomplete
answer

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

Globe
answer

___ valves should be used for throttling service.
question

a dirty heating surface
answer

A gradual increase in chimney temperature indicates ___.
question

1 ½
answer

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

6
answer

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

decreased
answer

As fuel oil is heated, its viscosity is ___.
question

6
answer

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

T
answer

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

T
answer

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

F
answer

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

T
answer

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.
question

F
answer

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

T
answer

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.
question

T
answer

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

F
answer

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

F
answer

T/F Scale protects the boiler heating surfaces.
question

F
answer

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

T
answer

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

T
answer

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

F
answer

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

F
answer

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.
question

T
answer

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

F
answer

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

T
answer

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

T
answer

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

T
answer

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

T
answer

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

F
answer

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

T
answer

T/F Steam traps are used wherever condensate collects.
question

F
answer

T/F A boiler feedwater pump cannot become steambound.
question

F
answer

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

T
answer

T/F Foaming can lead to carryover.
question

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

___ makes a pop-type safety valve pop open.
question

pulling the test lever by hand and then releasing it to allow it to \”snap\” closed
answer

Manual testing of the safety valve is accomplished by ___.
question

a mixture of water and steam
answer

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

soot blowers
answer

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

recommended feedwater treatment
answer

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

1
answer

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

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

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

boiler setting is cool enough to enter the firebox
answer

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

Overfire air
answer

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

boiler; chimney
answer

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

flash when exposed to an open flame
answer

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

burn continually
answer

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

lowest; flow
answer

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

dangerous to handle
answer

Fuel oil with a low flash point is ___.
question

Sulfur
answer

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

do not mix
answer

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

operating pressure control
answer

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

condensation in the line
answer

Water hammer in steam lines is caused by ___.
question

difference in pressure between two points
answer

A manometer measures ___.
question

atmospheric pressure
answer

A barometer measures ___.
question

horizontal return tubular
answer

In boiler room work, HRT means ___.
question

the superheater safety valve opens first
answer

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

at its lowest load
answer

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

testing the boiler water
answer

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

at least once a shift
answer

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

F
answer

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

F
answer

T/F All firetube boilers are horizontal boilers.
question

T
answer

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

F
answer

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

T
answer

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

F
answer

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

T
answer

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

T
answer

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

F
answer

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

F
answer

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

T
answer

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

T
answer

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

F
answer

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

T
answer

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

T
answer

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

F
answer

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

T
answer

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

T
answer

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

T
answer

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.
question

T
answer

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

T
answer

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

T
answer

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

F
answer

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

F
answer

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

T
answer

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

silica gel
answer

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

mixture; atomization; temperature; time
answer

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

pitting
answer

Oxygen in the boiler causes ___.
question

determine smoke density
answer

A Ringelmann test is used to ___.
question

an air- or water-driven turbine
answer

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

every 24 hours
answer

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

secure the fires
answer

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

none of the above
answer

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
question

establishes a steam flow through
answer

The superheater drain ___ the superheater during startup and shutdown.
question

acts as a flame failure control
answer

An infrared scanner ___.
question

purging after ignition failure
answer

A furnace explosion can be prevented by ___.
question

a broken baffle
answer

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

infrared light
answer

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

feedwater
answer

An economizer heats ___.
question

positive draft pressure
answer

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

100,000; therm
answer

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

the proportional chemical pump
answer

Chemicals are added to the boiler water by ___.
question

boiler; check valve
answer

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

spring-loaded
answer

A pop-type safety valve is a ___ type.
question

gases of combustion as they leave the boiler
answer

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

rolled and beaded
answer

Tubes in a firetube boiler are ___.
question

prevents corrosion at low rating
answer

The bypass damper on an air heater ___.
question

the same
answer

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

secure all of the feedwater going to the boiler
answer

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

recovers low pressure steam
answer

A flash tank ___.
question

T
answer

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

T
answer

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

F
answer

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

T
answer

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

F
answer

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.
question

F
answer

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

T
answer

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

T
answer

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

F
answer

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

T
answer

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

T
answer

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

F
answer

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

F
answer

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

T
answer

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

F
answer

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

T
answer

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

T
answer

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

F
answer

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

T
answer

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

F
answer

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

T
answer

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

F
answer

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

F
answer

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

T
answer

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

F
answer

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

the rotary cup and primary air
answer

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

open the air cock
answer

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

firetube boilers
answer

Staybolts are most commonly found on ___.
question

15 psi to 25 psi
answer

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

quick-opening; last
answer

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

five
answer

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

scale; inside
answer

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

internal resistance to flow
answer

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

2 ½
answer

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

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

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

manufacturer or an authorized representative of the manufacturer
answer

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

change scale-forming salts to a nonadhering sludge
answer

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

on a watertube boiler
answer

Soot blowers are most commonly found ___.
question

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

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

a minimal amount of excess air
answer

Complete combustion is defined as burning all fuel using ___.
question

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

When testing the safety valve by hand, ___.
question

174.7
answer

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

Ringelmann
answer

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

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

An automatic nonreturn valve is found on the ___.
question

superheated steam
answer

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

100
answer

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.
question

dry pipe
answer

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

a rise in chimney temperature
answer

A broken baffle in a watertube boiler causes ___.
question

reduces the turbulence of water in the gauge glass
answer

The water column on a high pressure steam boiler ___.
question

by hand or pressure
answer

Safety valves on high pressure boilers can be tested ___.
question

T
answer

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

T
answer

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

F
answer

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

F
answer

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

T
answer

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

T
answer

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

F
answer

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

F
answer

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

T
answer

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.
question

F
answer

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

T
answer

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

F
answer

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

T
answer

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

T
answer

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

F
answer

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

F
answer

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

T
answer

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

F
answer

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

F
answer

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

T
answer

T/F Preheaters heat air for combustion.
question

T
answer

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

F
answer

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

T
answer

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

F
answer

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

F
answer

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

thoroughly clean the fire and water sides
answer

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

blow down the boiler
answer

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

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

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

the top line is closed or clogged
answer

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

using try cocks
answer

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

full
answer

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

firetube
answer

A scotch marine boiler is a ___ boiler.
question

500
answer

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

accumulation
answer

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

above the feedwater pump on the suction side
answer

An open feedwater heater is located ___.
question

between the feedwater pump and the boiler
answer

A closed feedwater heater is located ___.
question

closed
answer

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

1 ½ times the MAWP
answer

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

at the NOWL
answer

The feedwater regulator element is located ___.
question

34.5
answer

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

os&y or lever
answer

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

slightly lower than line pressure
answer

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 ___.
question

1 ½ to 2 times the safety valve setting
answer

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

mud drum
answer

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

6% above the MAWP
answer

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

surface tension
answer

Water polluted with foreign matter causes an increase in ___.
question

when the firebox is cool but the boiler still has pressure
answer

Boiler waterwalls should be blown down ___.
question

allow the setting to cool
answer

Before draining a boiler, the operator should ___.
question

continuous blowdown
answer

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

temperature
answer

Pyrometers measure ___.
question

boiler
answer

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

pressure
answer

A pressure control is sensitive to ___.
question

pressure
answer

A vaporstat control is sensitive to ___.
question

Draft
answer

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

two
answer

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

1
answer

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

a high
answer

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

fan failure
answer

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

monthly
answer

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

the boiler has under 100 sq ft of heating surface
answer

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

superheated
answer

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

infrared rays
answer

A lead sulfide cell is sensitive to ___.
question

high fixed carbon
answer

Anthracite coal has a ___ content.
question

high volatile
answer

Bituminous coal has a ___ content.
question

a high furnace temperature
answer

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

at the NOWL
answer

The surface blowdown on a steam boiler is located ___.
question

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

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

atomize the fuel oil completely
answer

The function of the fuel oil burner is to ___.
question

set at 1 ½ times the MAWP
answer

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

steam flow, feedwater flow, and water level
answer

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

prevents backflow from the boiler into the feedwater line
answer

The check valve on the boiler feedwater line ___.
question

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

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

maintains a constant water level
answer

An automatic feedwater regulator ___.
question

leaks through the boiler side wall
answer

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

photocell
answer

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

alkaline
answer

Boiler water with a pH of 11 is ___.
question

7
answer

Neutral on the pH scale is ___.
question

impurities on the boiler water surface
answer

Foaming may be caused by ___.
question

excessive heat, corrosion, or freezing
answer

The blowdown line must be protected from ___.
question

siphon
answer

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

removes moisture from steam
answer

A dry pipe on a boiler ___.
question

manometer
answer

Draft is measured with a ___.
question

radiation
answer

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

overheating of the boiler metal
answer

Scale deposit in an HRT boiler can cause ___.
question

corrosion
answer

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

remove sludge and sediment
answer

A steam boiler is blown down to ___.
question

steam and water flow out of the middle try cock
answer

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

outside of the boiler shell
answer

The furnace of an HRT boiler is ___.
question

steam piston is larger than the water piston
answer

In a reciprocating feedwater pump, the ___.
question

an internal furnace
answer

A scotch marine boiler has ___.
question

expanded and flared
answer

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

pressure or vacuum
answer

A compound pressure gauge indicates ___.
question

hydraulic turbine cutters
answer

Scale on a watertube boiler can be removed by ___.
question

Anthracite
answer

___ coal has the highest amount of fixed carbon.
question

pea; buckwheat; rice; barley
answer

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

wire brush and vacuum cleaner
answer

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

soot blower
answer

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

scale buildup inside the tubes
answer

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

run of mine; lump; nut; slack
answer

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

No. 6
answer

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

density of the smoke leaving the boiler
answer

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

Four
answer

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

a blowdown tank
answer

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

rotating cup and primary air
answer

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

positive-displacement
answer

A steam-driven reciprocating pump is a ___ pump.
question

forced draft
answer

The underfeed stoker in steam plants uses ___.
question

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

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

feedwater pressure is higher than the boiler pressure
answer

In a closed feedwater heater, the ___.
question

open feedwater heater
answer

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

heat from the gases of combustion can be reclaimed
answer

Economizers are used in large plants so that ___.
question

atmospheric
answer

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

temperature
answer

A pyrometer measures ___.
question

pounds, square inch
answer

A steam pressure gauge is calibrated in ___ per ___.
question

combustion efficiency
answer

The Orsat analyzer is used to determine the ___.
question

firetube
answer

Staybolts are most commonly used in ___ boilers.
question

feedwater line
answer

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

removes moisture form the steam
answer

A dry pipe ___.
question

incomplete combustion
answer

Smoke is the result of ___.
question

below atmospheric
answer

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

the amount of moisture in the steam
answer

The throttling calorimeter determines ___.
question

as a secondary means of determining the water level
answer

The try cocks on a water column are used ___.
question

Lime; soda ash
answer

___ and ___ are used to soften feedwater.
question

chain grate
answer

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

the formation of slag
answer

A difficulty found when burning pulverized coal is ___.
question

a lower pressure than
answer

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

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