Download Boiler Operation Principles Possible Questions And Answers. and more Exams Nursing in PDF only on Docsity!
Boiler Operation Principles
Chapter (1) 1.Steam is formed when water is heated to its boiling point. - correct answer True 2.A boiler is an open metal container in which water is heated to produce steam or heated water. - correct answer False 3.Water begins to boil at 212°F at atmospheric pressure. - correct answer True 4.In a Scotch marine boiler, the gases of combustion pass through tubes that are surrounded by water. - correct answer True 5.Oxygen is needed to burn fuel. - correct answer True 6.Condensate is typically returned to the boiler for reuse. - correct answer True 7.The steam system supplies water to the boiler. - correct answer False 8.Steam leaves the boiler through the main steam line. - correct answer True 9.Steam that has given up its heat and turned back to water is boiler water. - correct answer False 10.Heat is generated in a boiler by the combustion of a fuel such as gas, fuel oil, or coal. - correct answer True 11.An internal furnace is a furnace in a boiler that is surrounded by heating surface. - correct answer True
12.Feedwater is water that is treated for use in a boiler. - correct answer True 13.Heat always flows from a material having a lower temperature to a material having a higher temperature - correct answer False 14.Latent heat is heat identified by a change of state and no temperature change of the substance. - correct answer True 15.Conduction is heat transfer that occurs when molecules in a material are heated and the heat is passed from molecule to molecule through the material. - correct answer True 16.Approximately 212 lb of air are required to bum a pound of fuel. - correct answer False 17.The ASME Code governs boiler design, material, method of construction, inspection, and quality assurance - correct answer True 18.A low pressure boiler is a boiler that has an MAWP over 15 psi. - correct answer False 19.A package boiler is a self-contained unit that is preassembled at the factory. - correct answer True 20.A firebox boiler is a cylindrical scotch marine boiler. - correct answer False 21.__ is necessary to generate steam in a boiler - correct answer A. container B. Water C. Heat D. all of the above*
32.The __ system provides the air necessary for combustion - correct answer B. draft 33.The_ is the highest pressure in pounds per square inch at which a boiler can safely be operated. - correct answer C.MAWP 34.A__ boiler does not use tubes. - correct answer A. cast iron 35.To increase efficiency of the boiler, . - correct answer C. the heating surface is increased 36.The four systems necessary to operate a boiler are , ,, and. - correct answer D. feedwater; fuel; draft; steam 37.pressure is the pressure caused by the weight of air surrounding the earth. - correct answer A. Atmospheric 38.During operation, a boiler. - correct answer A. holds water B. collects the steam that is produced C. transfers heat to the water to produce steam D. all of the above* 39.Water turns to steam at °F at atmospheric pressure - correct answer D. 212 40. boilers have sections that can be assembled on-site to produce the boiler capacity required. - correct answer D. Cast iron 41.The amount of energy required to raise the temperature of 1 lb of water 1 °F is 1 - correct answer D. Btu
42.Heat is transferred by__. - correct answer A. conduction B. convection C. radiation D. all of the above* 43.A(n) __ is a component directly attached to the boiler that is required for the operation of the boiler. - correct answer A. fitting 44.The nonflammable material used to insulate the outer surface of the boiler from heat is__ - correct answer A. refractory 45.__ is pure steam at a temperature that corresponds to the boiling point of water at a specific pressure. - correct answer D. Saturated steam Chapter (2) 46.Boiler fittings are components attached directly to the boiler. - correct answer True 47.Safety valves on steam boilers are designed to open slowly. - correct answer False 48.The safety valve should chatter to prevent damage to the disc. - correct answer False 49.Safety valves are tested only by performing a try lever test. - correct answer False 50.A safety valve try lever test is performed with the boiler at 15 psi or higher. - correct answer False 51.The steam pressure gauge must be connected to the highest part of the steam side of the boiler. - correct answer True
63.With water at the NOWL, water is discharged from the top try cock when opened - correct answer False 64.If the top line to the gauge glass is closed or clogged, the glass will fill with water. - correct answer True 65.If the bottom line to the gauge glass is closed or clogged, the glass will be empty. - correct answer False 66.To ensure the lines to the gauge glass are clear, it is recommended that the gauge be blown down at least once a month. - correct answer False 67.The bottom blowdown line must be connected to the highest part of the steam side of the boiler. - correct answer False 68.A high surface tension on boiler water can lead to foaming. - correct answer True 69.Surface impurities are removed from the boiler by using the bottom blowdown valves - correct answer False 70.Boilers equipped with a quick-opening valve and a slow-opening valve must have the quick-opening valve closest to the boiler. - correct answer True 71.Only watertube boilers have bottom blowdown valves. - correct answer False 72.A high water level in the boiler can lead to carryover. - correct answer True 73.When dumping a boiler, there should be maximum steam pressure in the boiler to force water from the boiler. - correct answer False
74.To correct a high water level condition in the boiler, the operator can open the bottom blow down valve. - correct answer True 75.Bottom blowdown valves are used when dumping the boiler. - correct answer True 76.A fusible plug is the last warning the operator has of a dangerous low-water condition in the boiler. - correct answer True 77.The core of the fusible plug melts at approximately 450°F. - correct answer True 78.The boiler vent is located at the highest part of the steam side of the boiler. - correct answer True 79.The safety valve should be used as a boiler vent for faster blowdown - correct answer False 80.The boiler vent should be open when filling the boiler with water. - correct answer True 81.The pressure control is located at the highest part of the steam side of the boiler. - correct answer True 82.The pressure control must be mounted in a vertical position to ensure accurate operation. - correct answer True 83.A burner should always start up in high fire to ensure enough fuel for ignition. - correct answer False 84.Burners using fuel oil or gas should be adjusted so they are OFF for longer periods than they are ON to save fuel and keep furnace temperatures lower. - correct answer False
95.The steam pressure gauge on the boiler is calibrated to read__. - correct answer B. pounds per square inch
- Steam is prevented from entering the Bourdon tube of the pressure gauge by a(n) __ - correct answer D. siphon 97.A __ pressure gauge can read either vacuum or pressure. - correct answer A. compound 98.Vacuum is pressure__ pressure. - correct answer C. below atmospheric
- Safety valves are designed to pop open and stay open until there is a(n) psi drop in pressure. - correct answer B. 2 to 4 100.Safety valves are used on boilers - correct answer A. firetube B. watertube C. cast iron D. all of the above* 101.The water column is located at the NOWL of a low pressure steam boiler, so the lowest visible part of the gauge glass is __ above the lowest permissible water level recommended by the boiler manufacturer - correct answer A. 1"
- Blowback is the__ in the boiler after the safety valve has opened. - correct answer A. drop in pressure
- The boiler bottom blow down line should discharge to a __. - correct answer A. blowdown separator B. blowdown tank C. heat exchanger D. all of the above*
104.If the desired cut-in pressure of the boiler is 6 psi and the desired cut-out pressure is 10 psi, the differential pressure setting must be _ psi. - correct answer B. 105.Impurities that build up on the surface of the water in the boiler prevent__ from breaking through the surface of the water. - correct answer D. steam 106.To prevent air pressure from building up in the boiler when filling the boiler with water, the__ must be open. - correct answer C. boiler vent 107.To prevent a vacuum from forming when taking the boiler off-line, the__ must be open when pressure is still on the boiler. - correct answer C. boiler vent 108.The operating range of the boiler is controlled by the __. - correct answer C. pressure control 109.The regulates the firing rate between high and low fire of the burner. - correct answer D. modulating pressure control 110.The best time to blow down a boiler to remove sludge and sediment is when the boiler is under a.
- correct answer B. light load 111.The level of the water in the indicates the water level in the boiler. - correct answer C. gauge glass 112.When blowing down a boiler, the quick-opening valve should always be opened and closed. - correct answer B. first; last 113.__ added to boiler water change(s) scale-forming salts into a nonadhering sludge. - correct answer D. Chemicals 114.A__ provides access inside the water side of the boiler for inspection, sight, or
125.A burner should always start up in __ fire and shut down in__ fire. - correct answer A. low; low Chapter (3) 126.A high water level condition in the boiler could lead to water hammer - correct answer True 127.A low water level condition in the boiler can result in damage to boiler heating surfaces. - correct answer True 128.The check valve on the feedwater line should be located closest to the shell of the boiler. - correct answer False 129.The check valve allows the flow of water in one direction only - correct answer True 130.The check valve on the feedwater line commonly has a valve disc that swings to open and close the valve. - correct answer True 131.A condensate return tank collects condensate returned from heating units for use in the boiler. - correct answer True 132.A globe valve used as a feedwater stop valve must be installed so inlet pressure is applied from under the valve disc. - correct answer True 133.The stop valve on the feedwater line should be located closest to the boiler. - correct answer True 134.The vacuum pump is designed to discharge air and pump water - correct answer True
135.Centrifugal feedwater pumps are commonly driven by steam. - correct answer False 136.A check valve is opened by turning the handle counterclockwise. - correct answer False 137.A low water fuel cutoff is located slightly below the NOWL. - correct answer True 138.The range of pressure on the vacuum switch on a vacuum pump is usually 2" to 8". - correct answer True 139.An evaporation test is performed by opening the low water fuel cutoff blowdown valve by hand. - correct answer False 140.Any loss of water in the system must be made up by the makeup water feeder. - correct answer True 141.The boiler operator must be present during an evaporation test. - correct answer True 142.The makeup water feeder can be used as a feedwater regulator - correct answer False 143.Most makeup water contains some scale-forming salts - correct answer True 144.The function of the automatic makeup water feeder is to replace water that has been lost. - correct answer True 145.The automatic city water makeup water feeder is located slightly below the NOWL - correct answer True
156.The primary function of a low water fuel cutoff is to . - correct answer B. shut down the burner if the water level drops below the safe operating level 157.Water added to the boiler to replace water lost due to leaks and blowing down is known as__water. - correct answer B. makeup 158.Excessive use of cold city makeup water reduces overall boiler efficiency because as the water must be__before use in the boiler. - correct answer B. heated 159.An auxiliary low water fuel cutoff is installed. - correct answer B. slightly below the primary low water fuel cutoff 160.The__shuts off the burner in the event of low water. - correct answer C. low water fuel cutoff 161.Water is supplied to the condensate return tank by the __ pump - correct answer A. vacuum 162.The feedwater regulator is located at the__. - correct answer C. NOWL 163.The__maintains a constant water level in the boiler. - correct answer D. feedwater regulator 164.The low water fuel cutoff should be tested__. - correct answer A. daily 165.The burner should be _ when the low water fuel cutoff is blown down. - correct answer B. firing Chapter (4)166.A nonreturn valve allows a boiler to be cut-in on-line or off-line automatically as the boiler pressure changes on startup or shutdown. - correct answer True
167.Heating units are designed to minimize heat loss from a building space. - correct answer False 168.A globe valve should never be used as a main steam stop valve. - correct answer True 169.Gate valves offer no restriction to flow when open. - correct answer True 170.A steam header is a distribution pipe that supplies steam to the branch lines. - correct answer True 171.A steam strainer should be located after a steam trap. - correct answer False 172.Steam traps are located throughout the system after each device where steam is used. - correct answer True 173.Expansion bends are used to route steam lines around obstacles. - correct answer False 174.Return steam traps discharge condensate directly back to the boiler. - correct answer True 175.Return steam traps are commonly found in modern boiler plants. - correct answer False
- Boiler main steam stop valves should be__ valves. - correct answer B. gate 177.Gate valves should always be __ or__ closed. - correct answer C. wide open; partly 178.All boilers in battery must have two main steam stop valves or one main steam stop valve and one__. - correct answer D. automatic nonreturn valve
190.When an os&y valve is open, the stem is in the__ position - correct answer C. up 191.A thermodynamic steam trap opens and closes by a(n) - correct answer B. movable disc 192.In a float thermostatic trap, the float rises to discharge__. - correct answer A. condensate 193.A steam trap that fails to open causes the heating unit to become __. - correct answer B. waterlogged 194.__remove dirt and impurities that may cause the steam trap to malfunction. - correct answer C. Steam strainers 195.A(n) __is a device used to measure radiation emitted from an object - correct answer B. infrared thermometer Chapter (5)196. Fuel oil and gas are the most commonly used fuels in low pressure boilers. - correct answer True 197.The fire point temperature is higher than the flash point temperature. - correct answer True 198.A fuel oil relief valve is located between the fuel oil pump and the fuel oil discharge valve. - correct answer True 199.The fuel oil pump should be started with its discharge valve open. - correct answer True 200.Cold fuel oil in the tank will give a high suction reading. - correct answer True
201.A dirty strainer results in low suction readings. - correct answer False 202.Starting the fuel oil pump with its discharge valve closed causes the relief valve to open. - correct answer True 203.Fuel oil burners commonly use atomizing burners - correct answer True 204.Rotary cup burners can burn only No. 2 fuel oil. - correct answer False 205.Rotary cup burners atomize fuel oil using a spinning cup and high-velocity air. - correct answer True 206.Air used to atomize fuel oil is primary air. - correct answer True 207.Secondary air is needed to bum the fuel oil efficiently - correct answer True 208.In an air atomizing burner, steam and fuel are discharged to the burner for combustion. - correct answer False 209.The air atomizing burner uses air to mix with the fuel oil to achieve a high degree of atomization. - correct answer True 210.Complete combustion is achieved in a burner by supplying the proper mixture of air and fuel to the furnace. - correct answer True 211.In a rotary cup burner, the solenoid valve controls the flow of fuel through the fuel tube. - correct answer True 212.Fuel oil to be removed from the burner nozzle is purged with air. - correct answer True
