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# HPB Quizzes

### HPB quizzes

Question | Answer |
---|---|

In conduction the transfer of heat from one material to another occurs due to direct _________. | contact |

_________ is the transfer of heat by the circulation of a liquid or gas flowing over the surface of a body. | convection |

When a pump is used to circulate water through a heating system it is a _________ _________ system. | forced convection |

One boiler horsepower equals ______ lbs.steam/hr. | 34.5 lbs.steam/hr. |

The flow of heat through electromagnetic waves is known as _________. | radiation |

The temperature of a liquid minus 32 is the _________ of the liquid. | enthalpy |

Formula for Total Force (TF). | TF=P*A TF=lbs. P=psi A=sq.units |

_________ _________ is the pressure applied to an object due to the gravitational attraction of the earth. | Atmospheric pressure |

_________ _________ is the sum of the gauge pressure and atmospheric pressure. | Absolute pressure |

_________ _________ _________ is the amount of heat required to raise the temperature of 1 lb. of water 1°F at 59°F. | British Thermal Unit |

Heat necessary to change 1 pound of a substance from a liquid to a gas at a constant temperature is _________ _________ ___ _________. | latent heat of evaporation |

_________ _________ is the temperature at which all molecular motion ceases. It is the absence of all heat. | Absolute zero |

Circle formulas: d? C? A? | d=2r C=d*pi or d*3.14 A=d*d*.7854 |

Volume of a cylinder? | V=d*d*.7854*L |

How many cu.in. in a gallon? | 231 g=cu.in./231 |

Given the L and W of a sqare duct, what is the formula to find the diameter of an equally sized round duct? | d=sq.rt.(l*w/.7854) |

A power boiler is a steam boiler that operates at pressures greater than ______ psi, or a hot water boiler that operates above ______ or ______. | 15 psi 160 psi 250°F |

A supercritical boiler is a boiler that operates in excess of ______ or ______. | 3206 psia 705°F |

One boiler horsepower equals how many btu's? | 33,475 btu's |

The maximum allowable voltage on a control circuit is ______. | 150 volts |

In order to permit the water in a hot water heating system to expand without a corresponding increase in pressure, an _________ _________ must be used. | expansion tank |

Pressure relief valve on a hot water boiler must be at least ______ diameter and not more than ______. | 3/4" 4-1/2" |

A low pressure boiler must have an ASME ______ stamp. | H |

The National Board of Boiler and Pressure Vessel Repair require an ASME ______ stamp for companies that repair boilers. | R |

Water hammer is caused by the quickly opening a _________ _________. | steam valve |

The ratio of the boiler's heat output to it's heat input is _________ _________. | boiler efficiency |

In _________ boilers, the water passes through tubes, and the products of combustion pass around the tubes. | watertube |

°C to °F | °F=(°C*1.8)+32 |

°F to °C | °C=(°F-32)/1.8 |

°F to °R | °R=°F+460 |

°C to °K | °K=°C+273 |

Formula for absolute pressure? | psia=gauge psi + 14.7 |

_________ prevents the tube ends from being overheated and being burnt off. | beading |

A throug stay differs from a diagonal stay in that it runs the _________ _________ of the boiler. | entire length |

The Economic boiler was an improvement on the HRT boiler. The economic boiler has more _________ _________ per square foot of floor space, it requires less _________ , and is easier to _________ as a single packaged unit. | heating surface brickwork ship |

A drypipe on a scotch marine boiler is used to remove _________ from the steam prior to leaving the boiler. | moisture |

A _________ drum below the rear headers was used to collect sediment and was blown down from time to time. | mud |

A _________ _________ is constructed of flat plates, referred to as a tube sheet and tube cap sheet. | box header |

Sulfur in the soot then unites with moisture from condensation to produce a _________ _________. | sulfuric acid |

Welding a flat strip of metal between the waterwall tubes is known as _________ wall construction. | membrane |

_________ consist of relatively close spaced vertical tubes forming the four walls of the furnace. These tubes help to protect the refractory of the boiler. | Waterwalls |

On HRT boilers, the shell is pitched 1 to 2 inches towards the back of the boiler to produce a more effective _________ _________ of the boiler. | bottom blowdown |

_________ is the transfer of heat from a liquid (or gas) flowing over the surface of a body. | convection |

_________ _________ is caused by the difference in density of a liquid due to a difference in temperature. | natural convection |

Because the shell of the HRT is exposed to the fire, it requires careful _________ _________ for scale, bulging, and blisters. | interior inspection |

The ratio of the maximum fuel input rate and the minimum fuel input rate is known as the _________ _________. | turn-down ratio |

The accumulation of _________ on the waterside of the boiler leads to overheating and possible sagging and loosening in the tubesheet. | scale |

Name three places internal corrosion occurs in a vertical boiler. | 1) around main feedwater inlet 2) on tubes at NOWL 3) top of lower tubesheet |

Prior to entering a confined space, the minimum amount of oxygen in the space ______ percent. | 19% |

The operation of a black liquor boiler is known for its _________ _________, and recovery of _________ _________. | steam generation soda ash |

Cogeneration plants sell _________ to local industrial plants and _________ to the local utility. | steam electricity |

_________ _________ boilers recover the heat in exhaust from gas turbine to produce useful steam. | Waste Heat |

A temperature sensor that measure the resistance of a platinum wire at different temperatures is a _________ _________ _________. | resistance temperature detector (RTD) |

The last form of over-pressure protection on the boiler, prior to lifting the safety valve is the _________ _________ _________. | high limit control |

The blowdown valve closest to the boiler is _________ first and _________ last. | opened first and closed last |

The minimum size piping between the boiler and water column is _____. | 1" |

The safety valve capacity must be sufficient to relieve all the steam that the boiler can generate at the _________ _________ _________ without allowing the pressure to rise more that ______ percent above the Maximum Allowable Working Pressure. | maximum firing rate 6% |

Two or more safety valves are required on a boiler with a heating surface in excess of ______ square feet or electric input of ______ KW. | 500 500 |

The accumulation of carbon dioxide in the condensate system produces _________ _________, which attacks and corrodes the steam metal piping. | carbonic acid |

A three element feedwater regulator senses _________ _________, _________ _________, and _________ _________. | water level feedwater flow steam flow |

Formula for actual boiler pressure when drum is located above gauge. | AP=GP-(EW/2.31) AP= actual pressure GP=gauge pressure EW=effective water leg, height in feet |

Formulas for Pressure reducing and bypass lines. | 1/3 * OC * VSPA and 1/2 * OC * BPA use laregest of the two OC, VSPA, and BPA are found in chart |

_________ _________ is the height in feet of the fluid above a designated gauge point. | static head |

_________ _________ is the static head plus the gauge pressure expressed in feet plus the friction head(if the fluid is flowing) | Pressure head |

_________ _________ is the vertical height or feet required to produce a certain speed of flow. Expressed by what formula? | velocity head v=.4085(gpm)/d² |

_________ _________ is the difference between the suction head and the discharge head. Its a measure of the work done by the pump. | total head |

1 foot of head = how many psi? 1 psig = how many ft. of water | 1 foot of head = .433 psi 1 psig = 2.31 ft. of water |

A _________ _________ is a check valve located at the bottom of the suction pipe that prevents the water from leaking out and maintains the priming of the pump. | foot valve |

Pump horsepower 1 PHp = ___ sec.? ___ min.? | 1 hp = 550 ft-lbs/sec 1 hp = 33,000 ft-lbs/min |

Formula for pump horsepower? | HP=GPM*8.33*height*SG/33,000*eff. |

GPM flow formula? | GPM=v*d²/.4085 |

5 classifications of pumps? | 1) reciprocating 2) rotary 3) centrifugal 4) propeller 5) jet |

GPM capacity formula? | GPM=LANE/231 L=length of stroke A=area of water cylinder N=# strokes/min (duplex=*2) E=efficiency |

Maximum developed pressure formula? | MP=steam P*A/ water A |

Water at it's boiling point is considered a _________ liquid. | saturated |

The ratio of the boiler's heat output to it's heat input is _________ _________. | boiler efficiency |

A power boiler is a steam boiler that operates at pressures greater than ______ psi, or a hot water boiler that operates above _________ or _________. | 15 psi 160 psi 250°F |

A supercritical boiler is a boiler that operates in excess of _________ or _________. | 3206 psi 705°F |

A boiler horsepower is the evaporation into dry saturated steam of _________ pounds per hour from and at 212°F. | 34.5 lbs./hr. = 1 bhp |

_________ btu's per hour output is one boiler horsepower. | 33,475 btu/hr = 1 bhp |

The maximum voltage allowable on a control circuit is _________ volts. | 150 volts |

A low pressure steam boiler must have and ASME ______ stamp. | H |

_________ prevents the tube ends from being overheated and being burnt off. | Beading |

A through stay differs from a diagonal stay in that it runs the _________ _________ of the boiler. | entire length |

The minimum size of the blowdown line is ______ inch, and the maximum size is ______ inches. | 3/4" 2-1/2" |

The accumulation of _________ on the waterside of the boiler leads to overheating and possible sagging and loosening of the tubesheet. | scale |

In conduction, the transfer of heat from one material to another occurs due to direct _________. | contact |

_________ is the transfer of heat from a liquid flowing over the surface of a body. | Convection |

When a pump is used to circulate water through a heating system it is a _________ _________ system. | forced convection |

The flow of heat through electromagnetic waves is known as _________. | radiation |

A power boiler is a steam boiler that operates at pressures greater than ______ psi, or a hot water boiler that operates above _________ or _________. | 15 160 psi 250°F |

A supercritical boiler is a boiler that operates in excess of _________ or _________. | 3206 psi 705°F |

The maximum voltage allowable on a control circuit is ______ volts. | 150 |

Pressure relief valve on a hot water boiler must be at least _________ diameter and not more than _________. | 3/4" 4-1/2" |

The minimum size blowdown line is _________ and the maximum size is _________. | 3/4" 2-1/2" |

Sulfur in the soot unites with moisture from condensation to produce _________ _________. | sulfuric acid |

Welding a flat strip of metal between the waterwall tubes is known as _________ wall construction. | membrane |

The ratio of the boiler's heat output to it's heat input is _________ _________. | boiler efficiency |

A boiler horsepower is the evaporation of _________ pounds per hour from and at 212°F. | 34.5 |

_________ btu's per hour output is one boiler horsepower. | 33,475 |

The operation of a black liquor boiler is known for it's _________ _________, and recovery of _________ _________. | steam generation soda ash |

The minimum size piping between the boiler and the water column is _________. | 1/2" |

The device that allows for greater surface area for steam to act upon, thus creating a popping action is called a _________ _________. | huddling chamber |

In lieu of a stop valve a _________ _________ may be used instead of the stop valve _________ to the boiler. | non-return valve closest |

A slow opening blowdown valve must complete _______ turns between full open and full shut. | 5 |

The accumulation of carbon dioxide in the condensate system produces _________ _________, which attacks and corrodes steam metal piping. | carbonic acid |

A three element feedwater regulator senses _________ _________, _________ _________, and _________ _________. | water level feedwater flow steam flow |

What is the total force acting on a 4" pressure relief valve with a popping pressure of 1200 psi? | TF = P * A TF = 1200 * 4 * 4 * .7854 TF = 15079.68 lbs. |

The two types of electric boilers are _________ and _________. | resistance electrode |

When the boiler steam pressure reaches set point of the main scale of the operating control, the burner will turn _________. | off |

The modulator controls the _________ _________ of the burner. | firing rate |

The last form of over-pressure protection on the boiler, prior to lifting the safety valve is the _________ _________ _________. | high limit control |

Steam atomization typically consumes about ______ percent of the steam produced by the boiler. | 2% |

The lowest temperature at which fuel oil will flow is the _________ _________. | pour point |

_________ _________ is the temperature at which fuel oil will give off a vapor that will ignite when exposed to open flame. | Flash point |

The temperature at which fuel oil will give off a vapor that will burn continuously once it has been ignited is the _________ _________. | fire point |

_________ is the amount of pressure below the setpoint that must be relieved before the safety valve closes. | Blowback |

Too much _________ causes dense, white smoke. | air |

The flow rate, in gallons per minute, through a 2-1/2" pipe with a velocity of 7 feet per second is _________ gpm. | gpm=v*d*d/.4085 gpm=7*2.5*2.5/.4085 107.1 gpm |

A 12" pipe filled with water 275 feet high will have _________ psi on a pressure gauge at the bottom of the pipe. | wp=h/2.31 wp=275/2.31 119.05 psi |

A pump moving 145 gpm of water to a height of 250 feet with an operating efficiency 92% will require _________ horsepower. | hp=(gpm*8.33*h*SG)/(33,000*eff) hp=(145*8.33*250*1)/(33,000*.92) 9.95 hp |

If the boiler is susceptible to freezing, _________ lay-up should be used. | dry |

Ligament cracks are cracks that occur between the _________ _________ on the tube sheet. | tube holes |

If a boiler is rated for 28,000,000 Btu's per hour, what is the equivalent boiler horsepower? | Bhp=Btu/33,475 Bhp=28,000,000/33,475 836.45 Bhp |

If a boiler is rated for 65,000 pounds of steam per hour, what is the equivalent boiler horsepower? | Bhp=lbs.steam per hr./34.5 Bhp=65,000/34.5 1884.06 Bhp |

95°F to °C | °C=(°F-32)/1.8 °C=(95-32/1.8 35°C |

73°C to °F | °F=(°C*1.8)+32 °F=(73*1.8)+32 163.4°F |

If the analysis of the boiler water indicated 85 ppm of calcium and 44 ppm of magnesium, what is the total hardness? | TH=(C*2.5)+(M*4.1) TH=(85*2.5)+(44*4.1)=212.5+180.4 392.9 ppm |

Created by:
cpotkay