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Multiple Choice Questions and Answers
Heating and Boiler Operations
Question 1: ___ is commonly used for heating or process applications.
- Choices:
- a. Coal
- b. Steam
- c. Gas
- d. Feedwater
- Correct Answer: B
Question 2: ___ applications use steam to produce heat, force, and/or mechanical action in a production application.
- Choices:
- a. Process
- b. Dry-cleaning
- c. Building space heating
- d. Laundry
- Correct Answer: A
Question 3: ___ is heat transfer that occurs when currents circulate between warm and cool regions of a fluid.
- Choices:
- a. Combustion
- b. Radiation
- c. Conduction
- d. Convection
- Correct Answer: D
Question 4: The ___ is the part of a boiler with water on one side and heat from gases of combustion on the other.
- Choices:
- a. furnace volume
- b. heating surface
- c. fire side
- d. water side
- Correct Answer: B
Heat Transfer and Sensible Heat
Question 5: Sensible heat is heat that ___.
- Choices:
- a. involves a change of state
- b. involves no temperature change of the substance
- c. changes ice to water
- d. can be measured with a thermometer or sensed by a person
- Correct Answer: D
Question 6: A ___ is used to transfer heat from one substance to another without allowing the materials to mix.
- Choices:
- a. thermometer
- b. heat exchanger
- c. thermostat
- d. regulator
- Correct Answer: B
Question 7: ___ is the form of energy identified by a temperature difference or a change of state.
- Choices:
- a. Gas
- b. Steam
- c. Heat
- d. Vapor
- Correct Answer: C
Combustion and Air
Question 8: ___ combustion is combustion that occurs when fuel is burned using only the theoretical amount of air.
- Choices:
- a. Perfect
- b. Incomplete
- c. Complete
- d. Primary
- Correct Answer: A
Question 9: ___ air is air supplied to a burner above the theoretical amount required to burn the fuel to ensure complete combustion.
- Choices:
- a. Primary
- b. Excess
- c. Secondary
- d. Pilot
- Correct Answer: B
Oil Reduction and Systems
Question 10: ___ is the process of reducing fuel oil into a fine spray of minute particles.
- Choices:
- a. Steam priming
- b. Convection loading
- c. Atomization
- d. Discharge shaping
- Correct Answer: C
Question 11: A ___ is used to reduce utility water pressure to prevent overpressure in a system.
- Choices:
- a. steam outlet
- b. safety valve
- c. pressure regulator
- d. water level
- Correct Answer: C
Question 12: During operation, a ___ holds water, transfers heat to the water to make steam, and collects the steam that is produced.
- Choices:
- a. draft system
- b. steam system
- c. feedwater pump
- d. steam boiler
- Correct Answer: D
Energy and Heating Systems
Question 13: The amount of energy required to raise the temperature of 1 lb of water 1°F is 1 ___.
- Choices:
- a. NOWL
- b. therm
- c. psia
- d. Btu
- Correct Answer: D
Question 14: Heat is transferred by ___.
- Choices:
- a. conduction, convection, and enthalpy
- b. convection, radiation, and enthalpy
- c. radiation, steam, and condensate
- d. conduction, convection, and radiation
- Correct Answer: D
Change of State and Systems
Question 15: ___ is the process that occurs when enough heat is added or removed to change a substance from one physical form to another.
- Choices:
- a. Thermodynamics
- b. Change of state
- c. Atomization
- d. Combustion
- Correct Answer: B
Question 16: A ___ system provides the air necessary for combustion.
- Choices:
- a. feedwater
- b. draft
- c. steam
- d. fuel
- Correct Answer: B
Question 17: The four systems necessary to operate a boiler are feedwater, fuel, draft, and ___.
- Choices:
- a. combustion
- b. stoker
- c. condensate
- d. steam
- Correct Answer: D
Boiler Types and Configurations
Question 18: A ___ boiler is a boiler in which heat and gases of combustion pass through tubes surrounded by water.
- Choices:
- a. firetube
- b. watertube
- c. cast iron
- d. straight-tube
- Correct Answer: A
Question 19: A ___ boiler is a boiler in which water passes through tubes surrounded by gases of combustion.
- Choices:
- a. firetube
- b. watertube
- c. cast iron
- d. firebox
- Correct Answer: B
Efficiency and Control
Question 20: ___ are used in boilers to direct the gases of combustion for multiple passes to obtain maximum efficiency.
- Choices:
- a. Combustion controls
- b. Firetubes
- c. Baffles
- d. Zone controls
- Correct Answer: C
Question 21: A boiler’s ___ is the highest pressure in pounds per square inch (psi) at which it can be safely operated.
- Choices:
- a. NOWL
- b. ASME
- c. MAWP
- d. LWFC
- Correct Answer: C
Question 22: A ___ boiler does not use tubes.
- Choices:
- a. cast iron
- b. scotch marine
- c. watertube
- d. firebox
- Correct Answer: A
Pressure and System Components
Question 23: ___ pressure is the pressure caused by the weight of air surrounding the earth.
- Choices:
- a. Atmospheric
- b. Thermal
- c. Conductive
- d. Absolute
- Correct Answer: A
Question 24: Because each section of a(n) ___ boiler is modular, sections can be assembled on-site to produce the boiler capacity required.
- Choices:
- a. firetube
- b. industrial watertube
- c. scotch marine
- d. cast iron
- Correct Answer: B
Boiler Accessories and Insulation
Question 25: A(n) ___ is a component directly attached to a boiler that is required for the operation of the boiler.
- Choices:
- a. fitting
- b. accessory
- c. fuel oil tank
- d. condensate return tank
- Correct Answer: A
Question 26: The nonflammable material used to insulate the outer surface of a boiler from heat is ___.
- Choices:
- a. refractory
- b. a steam bridge
- c. an aquastat
- d. a tube bank
- Correct Answer: A
Question 27: A ___ boiler is a boiler that uses the municipal solid waste that would normally go to landfills.
- Choices:
- a. cast iron
- b. refuse
- c. waste
- d. firebox
- Correct Answer: B
Safety and Pressure Vessel Code
Question 28: According to the ASME Boiler and Pressure Vessel Code, the ___ is the most important valve on a boiler.
- Choices:
- a. main steam stop valve
- b. safety valve
- c. automatic nonreturn valve
- d. feedwater stop valve
- Correct Answer: B
Question 29: According to the ASME Code, the MAWP of a low pressure steam boiler is ___ psi or less.
- Choices:
- a. 10
- b. 15
- c. 100
- d. 212
- Correct Answer: B
Safety Valve Functionality
Question 30: The total force on a safety valve is equal to the ___.
- Choices:
- a. area multiplied by diameter
- b. area multiplied by distance
- c. area multiplied by pressure
- d. MAWP multiplied by pressure
- Correct Answer: C
Question 31: If a safety valve is 3" in diameter, its area is ___ sq in.
- Choices:
- a. 2.05
- b. 3.14
- c. 4.32
- d. 7.07
- Correct Answer: D
Question 32: The ASME Boiler and Pressure Vessel Code allows ___ valve(s) to be placed between a boiler and a safety valve or between a safety valve and the point of discharge.
- Choices:
- a. no
- b. one
- c. two
- d. three
- Correct Answer: A
Question 33: Safety valve capacity is the amount of ___, in pounds per hour (lb/hr), that the safety valve is capable of venting at the rated pressure of the safety valve.
- Choices:
- a. water
- b. gas
- c. steam
- d. vapor
- Correct Answer: C
Question 34: The total force on a safety valve 3.5" in diameter with a steam pressure of 14 psi is ___ lb.
- Choices:
- a. 110.3
- b. 122.0
- c. 134.7
- d. 145.9
- Correct Answer: C
Safety Protocols
Question 35: A ___ valve must stay open until there is a drop in pressure of about 2 psi to 4 psi below the opening pressure.
- Choices:
- a. pop test
- b. safety
- c. chattering
- d. huddling
- Correct Answer: B
Question 36: Blowback is the ___ in a boiler that occurs after the safety valve has opened.
- Choices:
- a. drop in pressure
- b. carryover
- c. increase of pressure
- d. chattering of a feedwater valve
- Correct Answer: A
Question 37: The purpose of a safety valve is to prevent the pressure in a boiler from ___.
- Choices:
- a. exceeding the MAWP
- b. dropping below the MAWP
- c. causing a furnace explosion
- d. relieving water pressure
- Correct Answer: A
Measurement and Control
Question 38: The capacity of a safety valve is measured by the amount of steam that can be discharged per ___.
- Choices:
- a. shift
- b. hour
- c. minute
- d. day
- Correct Answer: B
Question 39: ___ is the rapid opening and closing of a safety valve.
- Choices:
- a. Depressurizing
- b. Pressurizing
- c. Chattering
- d. Huddling
- Correct Answer: C
Question 40: The safety valve on a low pressure boiler is designed to open when pressure in the boiler exceeds the ___.
- Choices:
- a. safety valve setting
- b. NOWL
- c. feedwater pump pressure
- d. bottom blowdown discharge pressure
- Correct Answer: A
Steam Flow and Gauge Operation
Question 41: After the total force of steam has lifted a safety valve off its seat, the steam enters the ___.
- Choices:
- a. huddling chamber
- b. combustion chamber
- c. steam holding tank
- d. main steam line
- Correct Answer: A
Question 42: Two common types of steam siphons are the ____ siphons.
- Choices:
- a. Bourdon tube and pigtail
- b. pigtail and U-tube
- c. spiral and S-tube
- d. spiral and U-tube
- Correct Answer: B
Question 43: A steam pressure gauge on a boiler is calibrated to read ___.
- Choices:
- a. inches of vacuum
- b. pounds per square inch
- c. absolute pressure
- d. pressure below atmospheric pressure
- Correct Answer: B
Question 44: A(n) ___ prevents steam from entering the Bourdon tube of a pressure gauge.
- Choices:
- a. automatic nonreturn valve
- b. inspector's test cock
- c. os&y valve
- d. siphon
- Correct Answer: D
Gauging and Safety Measures
Question 45: A ___ pressure gauge can read either vacuum or pressure.
- Choices:
- a. compound
- b. duplex
- c. suction
- d. vacuum
- Correct Answer: A
Question 46: Vacuum is pressure ___ pressure.
- Choices:
- a. above gauge
- b. below absolute
- c. below atmospheric
- d. equal to gauge
- Correct Answer: C
Question 47: The most common steam pressure gauge operates by the movement of a ___.
- Choices:
- a. Bourdon tube
- b. water column
- c. siphon
- d. pressure control
- Correct Answer: A
Question 48: A ___ is a device that sends a signal to a controller, such as a programmable logic controller or other digital controller.
- Choices:
- a. translator
- b. relay
- c. transmitter
- d. dispatch
- Correct Answer: C
Question 49: The level of the water in a ___ indicates the water level in the boiler.
- Choices:
- a. condensate return tank
- b. feedwater tank
- c. gauge glass
- d. blowdown tank
- Correct Answer: C
Boiler Maintenance and Operation
Question 50: A low pressure steam boiler must have ___ or more gauge glasses to determine the water level in the boiler.
- Choices:
- a. one
- b. two
- c. three
- d. four
- Correct Answer: A
Question 51: A ___ is a pipe fitting with removable plugs that allows for cleaning and inspection of piping.
- Choices:
- a. baffle
- b. boiler cross tee
- c. vent
- d. diverter fitting
- Correct Answer: B
Question 52: ___ is the process of evacuating water and undesirable accumulated material from a boiler or fitting, such as a gauge glass.
- Choices:
- a. Foaming
- b. Priming
- c. Carryover
- d. Blowdown
- Correct Answer: D
Question 53: A ___ is a vessel that prevents damage to a sewer system from steam and hot water by holding blowdown water until it is cool enough for safe discharge.
- Choices:
- a. pressure control
- b. feedwater tank
- c. gauge glass
- d. blowdown tank
- Correct Answer: D
Question 54: Surface impurities increase the surface tension in a boiler by creating a film which prevents ___ bubbles from breaking through the surface of the water.
- Choices:
- a. air
- b. oxygen
- c. CO2
- d. steam
- Correct Answer: D
Blowing Down Procedures
Question 55: The best time to blow down a boiler to remove sludge and sediment is when the boiler is under a ___.
- Choices:
- a. high load
- b. light load
- c. load twice the MAWP
- d. maximum load
- Correct Answer: B
Question 56: When performing a bottom blowdown, the valve closest to the boiler is always opened ___.
- Choices:
- a. first and closed first
- b. first and closed last
- c. last and closed first
- d. last and closed last
- Correct Answer: B
Question 57: ___ added to boiler water are used to turn scale-forming salts into a nonadhering sludge that stays in suspension in the boiler water.
- Choices:
- a. Oxygen
- b. Minerals
- c. Slag
- d. Chemicals
- Correct Answer: D
Question 58: ___ are located on the blowdown line used to release water from the bottom of a boiler.
- Choices:
- a. Bourdon tubes
- b. Bottom blowdown valves
- c. Operating controls
- d. Pressure controls
- Correct Answer: B
Question 59: ___ is a condition that occurs when large slugs of boiler water are carried into steam lines.
- Choices:
- a. Priming
- b. Carryover
- c. Chattering
- d. Blowback
- Correct Answer: A
Separation of Water and Steam
Question 60: A(n) ___ is a small tank for boiler blowdown water to flow through, where city water is added to the boiler water to reduce the discharge water temperature.
- Choices:
- a. huddling chamber
- b. exchanger
- c. blowdown separator
- d. feedwater tank
- Correct Answer: C
Question 61: To prevent air pressure from building up in a boiler when filling it with water, the ___ must be open.
- Choices:
- a. safety valve
- b. main steam stop valve
- c. boiler vent
- d. manhole cover
- Correct Answer: C
Question 62: A ___ is used to prevent a dangerous vacuum from forming in a boiler when it is taken out of service.
- Choices:
- a. safety valve
- b. boiler vent
- c. main steam stop valve
- d. manhole cover
- Correct Answer: B
Question 63: A ___ provides access inside the water side of a boiler for inspection, sight, or cleaning.
- Choices:
- a. boiler vent
- b. safety valve
- c. handhole
- d. siphon
- Correct Answer: C
Question 64: At sea level, a vacuum in a boiler results in a force of ___ lb applied on every square inch of surface.
- Choices:
- a. 14.7
- b. 17.5
- c. 19.3
- d. 21.4
- Correct Answer: A
Boiler Degradation and Metal Integrity
Question 65: ___ weakens the metal and shortens the life of a boiler.
- Choices:
- a. Pitting
- b. Chattering
- c. Dumping
- d. Venting
- Correct Answer: A
Question 66: A ___ is a boiler fitting used to vent air from inside the boiler.
- Choices:
- a. vacuum
- b. boiler vent (air cock)
- c. safety valve
- d. feedwater tank
- Correct Answer: B
Question 67: When a boiler that has been producing steam is taken off-line, steam in the boiler cools and condenses, creating a ___.
- Choices:
- a. pressure drop
- b. manhole
- c. vacuum
- d. blowdown
- Correct Answer: C
Question 68: The operating range of a boiler is controlled by a(n) ___.
- Choices:
- a. aquastat
- b. vaporstat
- c. pressure control
- d. pressurestat
- Correct Answer: C
Question 69: A(n) ___ regulates the firing rate between high and low fire of a burner.
- Choices:
- a. aquastat
- b. vaporstat
- c. pressure control
- d. modulating pressure control
- Correct Answer: D
Boiler Startup and Shutdown Protocols
Question 70: A ___ should always start up in low fire and shut down in low fire.
- Choices:
- a. burner
- b. pressure control
- c. gauge
- d. vent
- Correct Answer: A
Question 71: A ___ is a switch that starts a burner, controls a firing rate, or shuts down a burner based on steam pressure.
- Choices:
- a. safety valve
- b. pressure control
- c. gauge
- d. transmitter
- Correct Answer: B
Question 72: The ASME Boiler and Pressure Vessel Code requires each automatically fired steam boiler to be protected from overpressure by ___ pressure-actuated control(s).
- Choices:
- a. one
- b. two
- c. three
- d. four
- Correct Answer: B
Question 73: The mercury tube in a pressure control must be inspected at least ___ for mercury vaporization.
- Choices:
- a. biweekly
- b. monthly
- c. once a year
- d. twice a year
- Correct Answer: D
Question 74: Steam at a pressure of 0.0 psig (14.7 psia) has a temperature of ___ °F.
- Choices:
- a. 100
- b. 212
- c. 248
- d. 298
- Correct Answer: B
Heat Exchange Principles
Question 75: A heat exchanger is used to transfer heat from a ___.
- Choices:
- a. higher pressure fluid to a lower pressure fluid
- b. lower pressure fluid to a higher pressure fluid
- c. hotter fluid to a colder fluid
- d. colder fluid to a hotter fluid
- Correct Answer: C
Question 76: A ___ is an auxiliary device commonly used with boilers to transfer heat from a hotter fluid to a cooler fluid.
- Choices:
- a. heat exchanger
- b. blowdown tank
- c. blowdown attemperator
- d. steam trap
- Correct Answer: A
Question 77: A(n) ___ is a common type of heat exchanger used to heat the air in a building space.
- Choices:
- a. radiator
- b. furnace
- c. air duct
- d. boiler
- Correct Answer: A
Question 78: One of the most common types of heat exchangers in industrial applications is a ___ heat exchanger.
- Choices:
- a. waste energy
- b. pillow plate
- c. shell-and-tube
- d. plate-and-shell
- Correct Answer: C