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What causes 90% of all construction injuries and deaths and are used to help OSHA inspectors improve their effectiveness? - ANSFocus Hazards What is the minimum safe working distance for overhead power lines? - ANS10 feet What is the standard procedure used to safely de-energize equipment on circuits before they are worked on? - ANSLockout/Tagout Which of the following is not true about Material Safety Data Sheets? - ANSThey can be written in any language What are the four focus inspections OSHA compliance officers look for? - ANSFall Hazards, Electrical Hazards, Caught in, Struck by The sizes of pipe are identified by the measurement called the: - ANSNominal pipe size NPS Steel pipe is supplied with the following end finish (es): - ANSPESC, T & C TBE (All of the above) What is a typical type of welded pipe joints? - ANSButt-welded, Socket-welded, Slip-on Flanged (All of the above) List the four principle functions of valves. - ANSStart/Stop, Regulate/Throttle, Relief, Reduce Regulating or throttling flow is done with a: - ANSBoth B and C, (globe and gate valve) Name the two basic types of check valves. - ANSLift and Swing The most common hanger used in piping systems is the: - ANSClevis Never expose any part of a compressed gas cylinder to temperatures above: - ANS125°F The four types of copper tube joints are soldered, brazed, flared and _____? - ANScompression What is the maximum recommended service temperature when a brazed joint is used? - ANS350 degrees F Poor alignment of tube joints will cause: - ANSspacing difference between tubes and fittings After fittings and tubes are cleaned and fluxed they should be assembled and soldered: - ANSas soon as possible Name three basic hitches which can be used for lifting with a sling - ANSStraight, Choker, Basket Which hitch can support the most weight? - ANSBasket hitch Why should the angle between the leg of a sling and the load never be less than 30 degrees? - ANSMore stress loads are applied on slings. What is the weakest part of a chain hoist? - ANSLower hook An oxyacetylene flame has a peak temperature of approximately: - ANS6300°F What is the purpose of slightly opening/cracking a gas cylinder valve before installing a gas regulator? - ANSclear debris Why is it important to ensure that no part of the oxygen handling equipment comes in contact with oil? - ANScauses an explosion
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What is the constant used to find the travel with a 45 degree offset? - ANS1. What is the constant used to find the offset or advance with a 45o offset? - ANS. Add: 5 1/8 + 1 1/4 + 4 ½ = - ANS10 7/ Subtract: 9 5/8 - 6 15/16 = - ANS2 11/ Multiply: 3 1/5 x 1 ¼ x 1 1/3 = - ANS5 1/ Divide: 11 ¼ by 2 ½ = - ANS4 1/ Change the following to architectural measurements 3.96': - ANS3' - 11 ½" MSDS is part of the "right to know" law. - ANSt IDLH is an individual's daily level of hazards - ANSf Inhalation, ingestion, absorption and injection are four routes of entry. - ANSt When voltage is applied to a conductor, free electrons: - ANSAre impelled along the conductor The magnetic field around a current-carrying wire: - ANSExists at all points along its length A lamp has a source of 110 volts and current of 0.9 amps, what is the resistance of the lamp?
- ANS122.2 ohms The device used in circuits to prevent damage from overloads is called a: - ANSFuse A thermocouple: - ANSGenerates a small amount of voltage when heated Sensible heat is defined as: - ANSquantity of heat involved to change a substance that can be measured with a thermometer Latent heat is defined as: - ANSamount of heat required to bring about a change in state in a substance Specific heat is defined as: - ANSamount of heat in BTU's required to change the temperature of 1 pound of a substance 1oF. The pressure at a certain depth below the surface of a liquid: - ANSis the same in all directions Pressure is: - ANSforce per unit of area Work is defined as: - ANSforce times distance Name the two main classifications of pump types. - ANSPositive Displacement pumps and Non-Positive Displacement pumps The violent flashing and collapsing of vapor bubbles in a centrifugal pump is called? - ANSCavitation What are two kinds of misalignment that must be checked for when installing pumps - ANSParallel and Angular alignment What steps should be taken before starting a pump for the first time? - ANSPrime, Check suction and discharge valves, Check rotation What are two of the three main items shown on a pump curve? - ANSHead in Feet and GPM Theoretically, how many feet can a pump can raise water vertically by suction? - ANS34 feet The welder is at most serious and immediate risk of - ANSelectrocution
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How many GPM must be circulate for every 10,000 BTUH of heat emission on a boiler. - ANS Name 3 secondary refrigerants: - ANSWater, Brine, Glycol What is the name of the unit that can heat and cool? - ANSHeat pump Name the odorant used in natural gas and propane. - ANSMercaptan What do the 3 sides of the combustion triangle represent? - ANSFuel, oxygen, and heat What are the names of the harmful products of incomplete combustion? - ANSCarbon monoxide & Aldehydes In the U.S. what percent of electricity is produced from power plants using steam? - ANS90% What is the main advantage of a fluidized bed boiler? - ANSLow SO & NOx emissions What must be checked on a boiler before putting it on line for the first time? - ANSSafety Relief Valve Name the portion of the boiler which increase the temperature of the steam so that it does not condense in the turbine. - ANSReheater Name the heat-transfer surface that transfer heat from the flue gas to the boiler feedwater. - ANSEconomizer Name the heat-transfer surface that raises the steam temperature above it corresponding saturation temperature. - ANSSuperheater Name the device used for collecting dust from a flue gas stream. - ANSElectrostatic Precipitator Normally Open (NO) and Normally Closed (NC) indicate the state of a switch when it is: - ANSDe-Energized The measurement unit used to express the rate of flow, refers to the: - ANSVelocity What is a device that changes a voltage signal to a current signal? - ANSE/I transducer A number value on a pH scale indicates the: - ANSAcidity or alkalinity of a chemical As the temperature rises in a closed vessel the pressure: - ANSIncreases USING THE 4 TO 1 RULE THE DISTANCE OUT FROM A WALL THE LADDER SHOULD BE IF THE WORKING LENGTH IS 16FT WOULD BE? - ANS4FT PIPE IS MADE IN WHICH OF THE FOLLOWING SIZES: - ANS1/8" TO 48" PIPE SIZES ARE IDENTIFIED BY A MEASUREMENT CALLED THE - ANSNOMINAL PIPE SIZE UNIFORM LENGTHS OF STEEL PIPE ARE WHAT LENGTH (±1") - ANS21' COPPER TUBE IS DESIGNATED AS TYPE(S) - ANSALL OF THE ABOVE (K,M,L) CAST IRON PIPE HAS GOOD RESISTANCE TO - ANSCORROSION, ABRASION, DEFORMATION (ALL OF THE ABOVE)
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THE NAME OF ALL SEGMENTS OF DIES USED FOR CUTTING THREADS ARE
CALLED - ANSCHASERS
WHAT FORMULA MUST BE USED TO CALCULATE THE STEP AHEAD IN A
PARALLEL OFFSET - ANS.414 x EQUAL SPREAD THE DEVICE WHICH FORMS A WATER SEAL THAT PREVENTS RAW STEAM FROM ENTERING AND DAMAGING PRESSURE GAUGES IS A(N): - ANSPIGTAIL THE BOILER RETURN LINE IS CONNECTED TO THE STEAM MAIN BY A(N): - ANSEQUALIZING LINE THE STEAM FLOW INTO RADIATORS IN A ONE PIPE GRAVITY RETURN STEAM HEATING SYSTEM CAN BE CONTROLLED BY: - ANSINSTALLING AN AIR VENT WITH A DIFFERENT VENTING CAPACITY THE LENGTH OF PIPE (DRIP CONNECTION) THAT IS NEEDED TO OVERCOME THE PRESSURE DROP IN A ONE PIPE GRAVITY RETURN STEAM HEATING SYSTEM AND RETURN CONDENSATE TO THE BOILER IS - ANS28 INCHES A THERMOSTATIC STEAM TRAP THAT FAILS IN THE CLOSED POSITION WOULD CAUSE A HEATING UNIT TO BECOME - ANSWATERLOGGED IF THE FLOAT IN A F & T TRAP FAILED AND FILLED WITH WATER THE TRAP WOULD - ANSNO CONDENSATE WOULD BE DISCHARGED IN A TWO-PIPE GRAVITY RETURN STEAM SYSTEM. THE DEVICE THAT PREVENTS RAW STEAM FROM ENTERING THE SYSTEM IS A - ANSSTEAM TRAP IN ORDER TO RETURN CONDENSATE TO A BOILER THE HEIGHT OF THE WATER COLUMN NEEDED TO OVERCOME THE PRESSURE DROP IN A TWO PIPE GRAVITY RETURN SYSTEM IS - ANS28 INCHES FOR EACH POUND OF PRESSURE THE BOILER IS PRODUCING WHEN STEAM IS SUPERHEATED IT'S - ANSTEMPERATURE IS INCREASED WITH NO INCREASE IN PRESSURE WHAT IS LIKELY TO OCCUR IF A PACKING GLAND WAS ADJUSTED TOO TIGHTLY: - ANSDIFFICULTY IN TURNING THE HANDWHEEL 600WOG ON A VALVE ID PLATE STANDS FOR: - ANSRATED FOR 600 LBS. WATER, OIL OR GAS AT AMBIENT TEMP. ON A BALL VALVE, HOW MANY TURNS OF THE HANDLE DOES IT TAKE TO GO FROM FULL OPEN TO CLOSED? - ANS1/4 TURN A HARTFORD LOOP IS USED FOR: - ANSPROTECTION FOR LOSS OF WATER IN THE BOILER THE COLOR CODE FOR TYPE K COPPER TUBING IS: - ANSGREEN TO ORDER A REDUCING TEE, YOU SHOULD SPECIFY THE SIZE BY: - ANSLARGE END TO SMALLER END TO CENTER
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ON A CENTRIFUGAL PUMP WHAT IS ROTATED BY THE MOTOR - ANSTHE
IMPELLER
What are the three types of globe valves commonly found? - ANSy - pattern, angle an straight Using figure 1 identify the correct Hand Signal for: Boom Down: - ANS Using Figure 1 identify the correct Hand Signal for: Raise Load: - ANS Using Figure 1 identify the correct Hand Signal for: Boom Down- Raise Load - ANS Using Figure 1 identify the correct Hand Signal for: Extend Boom: - ANS Using Figure 1 identify the correct Hand Signal for: Lower Load Slowely: - ANS If a gallon of water occupies .135 cubic feet how many gallons will a tank 5ft. long, 24 inches wide and 4 feet deep hold. - ANS Convert .25 feet to an inch measurement. - ANS3" The specific weight of an unknown substance is 4.8. How much does a cubic foot of this substance weigh? - ANS300lbs Steel pipe 380 feet long is heated from 620 to 1710 how much did the pipe expand? (Coeficient of thermal expansion for steel pipe is .0000067) - ANS3 5/16" A machine has a primary pulley of 6 in. and a secondary pulley of 24 in. What is the gear ratio? - ANS4 to 1 A pipe stands 126 feet high and is filled with water. What is the pressure at 30 feet above the bottom? - ANS41 psi What is the area of a circle if the diameter is 18 inches? - ANS254.46 sq in The change in state from a solid to a liquid is known as: - ANSFusion The treatment of liquids in motion is known as - ANSHydro - dynamics The weight of 1 cubic foot of water is: - ANS62.4 lbs The specific weight of air and water is: - ANS The density of water is? - ANS62. What should an outside attendant do to rescue a worker who shows physiological effects of exposure in a confined space? - ANSNotify response team and allow them to rescue. The treatment of liquids at rest is known as: - ANSHydrostatics The density of 1 cu. in. of Mercury is: - ANS.491 lbs A pipe stands 252 feet high and is filled with water. What is the pressure at 30 feet above the bottom? - ANS96 psi What is the area of a circle if the diameter is 2 in? - ANS3.14 sq in The change in state from a Liquid to a gas is known as: - ANSVaporization The use of air as a power source is known as: - ANSPneumatics Exits from a trench 150 foot long and 4 foot deep must be located within how many feet of a worker in the trench? - ANS25 feet
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For an extension ladder to be at the correct angle for safe use on a working surface 20 feet high. The ladder must be located how many feet away from the base? - ANS When the crane signaler's hand is pointed up with his/her finger moving in a circle, it means:
- ANSRaise the boom A sling is weakest in which position? - ANSChoked position The best knot to use when lifting pipe vertically is the: - ANSPipe Hitch with a half hitch Horizontal steam supply piping should be reduced in siz by using: - ANSEccentric reducer (flat on bottom) A float and thermostatic trap is a: - ANSThermostatic / thermodynamic trap A vent is not needed on a condensate receiver when: - ANSMechanical return is used Steam supply using parallel flow is: - ANSSteam and condensate flowing in the same direction A Hartford Loop is used for: - ANSProtection for loss of water in the boiler A bushing is not a good replacement for a reducer because they: - ANSOffer more resistance to flow What is the main reason for the taper on a pipc thread? - ANSEnsure progressively tighter fit The color code for Type K copper tubing is: - ANSGreen The best method to ensure that a plastic Joint is made properly, you should: - ANSInsert pipe into fitting and tum 1/4 tum and hold Which of the following types of clamps are used to dampen a pipe's movement? - ANSSnubber To properly align a flange you must perform what is commonly called a _______ hole: - ANSTwo To order a reducing tee you should specify the size by: - ANSLarge end to smaller end to center The specific Gravity of a liquid can only be measured using the following instrument: - ANShydrometer The symbol π, is equivalent to: - ANS3. The amount of heat it takes to raise one pound of water one degree Fahrenheit is know as a/an: - ANSBTU When should a person designated as a attendant (hole watch) attempt to rescue a worker that is trapped? - ANSNever What is the required distance for a crane to maintain from a 50Kv power line? - ANS10' Which rigging configuration has the greatest sling strength? - ANSBasket When lifting ohjects with sharp edges, you should use a: - ANSSoftener What are the three types of steam traps? - ANSThermostatic, Thermoodynamic, and Mechanical
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To determine the travel for a 45 degree rolling offset you would: - ANSMultiply the length of the hypotenuse of the roll and the set by 1. Convert 7/16" to a decimal. - ANS. What is the pressure 1/4 the way up from the bottom of a pipe 100' tall filled with water? - ANS32. The face to center measurement of any welded angle fitting equals: - ANStangent 1/2 angle times radius To determine the set on a 45 deg offset you would multiply the travel by: - ANS. To determine the face to center measurement of a long radius 90 degree elbow, multiply the pipe size by: - ANS1. What is the C-C offset for a 25 1/2" travel? - ANS18" When a pipe size is decreased by half, the carrying capacity of the pipe decreases by: - ANSQuarter A single line drawing of a piping system represents the: - ANSCenter of the pipe A Schematic drawing is: - ANSAll of the above What size hole should be cut into a main to saddle in a smaller pipe? - ANSThe same OD as the branch The pipe size of a pipe changes from the ID to the OD on what size pipe? - ANS14" What is the best valve for throttling? - ANSGlobe When selecting a hanger for a piping system you should consider: - ANSAll of the above What is the purpose of the expansion joint in a steam system? - ANSTo provide movement caused from a change in temperature What is the minimum thickness for threading PVC pipe? - ANSSch 80 What does the stamp Oxy-Med stand for on copper tubing? - ANSThe tubing has been cleaned for use on refrigeration What type of flame should be used to cut carbon steel? - ANSNeutral When should you ream the end of a pipe? - ANSAfter cutting A rating of 150# refers to a flange's: - ANSPressure Rating Oil is used on a pipe machine to: - ANSCool and lubricate the die What is the maximum pressure for an acetylene hose? - ANS15 PSI When ordering ACR copper specify the size by: - ANSOD When brazing for medical gas or refrigeration always: - ANSPurge the line when brazing A dielectric fitting should be used on: - ANSSteel to copper joints A vertical line in an isometric drawing represents: - ANSUp and down To view the west elevation the viewer's perspective is from the: - ANSWest of the building How many cubic feet are in a tank that is 24" by 3'-6" by 4'-8" - ANS32. What is the take off of a 4" 45 Deg Ell? - ANS2 1/2" How do you figure the area of a Circle? - ANSRadius squared times Pi
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How much water is in a tank that is 2' x 3' x 4'? - ANS180 Gallons What is the gear ratio for an 8" primary gear and a 24" secondary gear? - ANS3 to 1 How much does a cubic foot of a substance weigh if its density is 8.4? - ANS8. What is the pressure at the bottom of a tank that is 10' long 6' wide and 8' deep filled with water? - ANS3. What is the specific gravity of water? - ANS How much heat is required to raise 1/2 pound of water 1 degree F? - ANS1/2 BTU The combining of more than one metal is: - ANSAlloying The pressure exerted by a liquid at rest is: - ANSHydrostatic The letters MSDS stand for: - ANSMaterial Safety Data Sheets How often should the atmosphere be tested in a confined space? - ANSContinuously An exit from a trench should be no more than: - ANS25' from any worker To raise the boom of a crane: - ANSPoint the thumb up Steam condensate lines should use: - ANSSch 80 Steel pipe Steam condensate lines should be installed on: - ANSRoller hangers What is installed after the isolation valve and before the trap union on a standard trap assembly? - ANSStrainer A rating of 300# refers to a flange's: - ANSPressure Rating A mixing valve has ______ inlets and _____ outlets. - ANS2 and 1 What instrument is best for measuring vacuum? - ANSManometer Why can the flux be omitted in a brazed joint? - ANS What do the first two digits mean in E7018 electrodes? - ANSThe tensile strength of the rod in PSI times 1000 What are the main differences between soldeflng and brazing? - ANSThe temperature that the joints are made, the flux, and temperatures of the system What temperature does water boil at sea level? - ANS212° F What is on the low side of the vapor compression cycle? - ANSThe evaporator What type of copper is recommended for refrigeration? - ANSType L What is the expansion and compression of water vapor in a pump? - ANSCavitation Why is it necessary to use flux on a soldered Joint? - ANSTo chemically prepare the pieces for soldering Annealing copper - ANSSoftens it What is capillary action7 - ANSThe flow of a liquid into a small space Which of the following is not a confined space? - ANSA service tunnel connecting two buildings Before attaching regulators to an oxygen cylinder - ANSBlow the valves for a moment What should be done first when preparing a copper joint? - ANSClean all surfaces When a fluxed joint is overheated it will not: - ANSFuse
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What type of sensor is directly in the process stream? - ANSImmersion The 6G welding position is: - ANSWith the weld at a 45 degree angle Soidered joints should never be used on systems above: - ANS250 Degrees When a soldered joint is overheated - ANSThe flux burns and the joint becomes ineffective In a Hydronic heating system, units at the top of the system not heating are likely to be: - ANSAir bound A fan coil uses ____ to distribute heating or cooling to the space. - ANSForced convection A system in which the refrigerant is in the shell and cools the fluid in the tubes is: - ANSFlooded On a centrifugal pump what is rotated by the motor? - ANSThe impeller What causes water to move in a hydronic system? - ANSThe pump creates a differential in pressure that moves the water The correct measurement for elevation "A" in the drawing below is: - ANS43'-6" The correct measurement for dimension "B" in the drawing below is: - ANS5'-5" The correct measurement for dimension "C" in the drawing below is: - ANS39'-8" mc055-1.jpg The correct measurement for elevation "D" in the drawing below is: - ANS32'- 2 11/16" The type of drawing that views a building by looking directly at the front, top and side is referred to as a/an _________ drawing. - ANSorthographic The type of drawing that most closely resembles an object as the eye would see it is referred to as a/an __________ drawing. - ANStrue isometric The symbol below represents a: - ANSFlanged butterfly valve. The symbol below represents a: - ANSScrewed tee side outlet away from you What is the function of the covering on the electrodes during the process of "Shielded Metal- Arc Welding"? - ANSAll of the above When arranging weld coupons for testing position 6G: - ANSAxis of pipe should be on a 45 degree Both soldered and brazed joints are made by heating a properly prepared joint to the proper temperature and the flowing of a filler metal by means of: - ANSCapillary action When the crane signaler's hand is pointed up with his/her finger moving in a circle, it means:
- ANSRaise the boom Pipe guides allow the pipe to move in an axial direction only. - ANSTrue What causes pressure drop is the friction created between the inner walls of the conveyer and the moving liquid. - ANSt It is essential to install a pressure reducing valve on the inlet cold water supply to a boiler water feeder. - ANSf Float traps may be used to vent air or water from vapors or other gas lines. - ANSf
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A Steam Trap is the elastic, ariform fluid into which water is converted when heated to the boiling points; water in the state of vapor. - ANSt A condensate pump must be located at the lowest point of the return and as close as possible to the boiler as possible. - ANSt When using weld-o-let fittings the three different joining methods that can be attained are Rear Weld, Socket Weld, and Laced Weld - ANSf The four types of check valves are Swing, Lift, Vertical, and Ball check valves. - ANSt A valve marked only 220 W.O.G. may be used for steam service. - ANSf With the quantity of flow in gpm constant, the velocity of flow will increase with a decrease in pipe size. - ANSt The Specific Heat of substance is the ratio of it heat capacity of that of water. - ANSt A vapor whose temperature and pressure are such that any compression of its volume at constant temperature causes it to condense to liquid at a rate sufficient to maintain a constant pressure. - ANSt Centrifugal pump, a machine in which water or other fluid is lowered and syphoned through a pipe by the energy imparted by a wheel or blades revolving in a fixed case. Some of the largest and most powerful pumps are of this kind. - ANSf How many turns are required to open a closed ball valve? - ANSone quarter turn If the density D and the weight W of an object is known, write a formula that may be used to determine the volume of an object. - ANSV= W/D In the expansion of liquids, we are concerned only with their increase in: - ANSVolume In what ways are steam heating systems classified? - ANSOne pipe and Two pipe system A ___________ is an arrangement of piping between a steam boiler's header and its gravity- return piping. - ANSHartford Loop A Pop safety valve, that is set to open at 15 psi will close when the pressure is reduced to _______ psi. - ANS What type of pump is normally used as a feed water pump? - ANScentrifugal Hydronics is a heating system for a building in which the medium for carrying heat throughout the structure is circulating water. - ANSt Where must the expansion tank be located in a gravity hot water system? - ANSAbove the highest convector What is the maximum working pressure of the average hot water boiler? - ANS30 psi What type of copper tubing joint requires the use of a ferrule? - ANScompression What are 3 fuel gases used for heating pipe or tubing? - ANSMAPP, acetylene, and propane The purpose of the foot switch on a power-operated pipe cutting and threading machine is to:
- ANSact as a safety device to shut off the motor if the operator's foot is removed from the swich
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The color code for type "K" copper tube is: - ANSgreen The shape of a p - trap forms a/an: - ANSpositive trap seal In medical gas installations a purge is required while brazing, along with what percent penetration? - ANS100% The weight of 47 gallons of water is ____________ lbs: - ANS391. How many square inches in a square foot? - ANS What is the Offset Constant for a 45 degree angle: - ANS1. How many gallons of water per cubic foot? - ANS7. What is the weight of one cubic foot a water in pounds? - ANS62. What is the weight of one gallon of water? - ANS8. What is the pressure exerted by one foot of head water? - ANS0.43 lbs psi What is the formula for the area of a rectangle? - ANSL x W What is Pi? - ANS3. What is the head of water in a foot for one psi? - ANS0. What is the formula for finding an area of a circle? - ANS3.14 x R The formula for the volume of a cylindercal tank: - ANS3.14 x R2 x H The formula for the Circumference of a circle: - ANS3.14 X D The formula for a rectangular tank? - ANSL x W x H How many cubic inches in a cubic foot? - ANS Formula to find the offset of a right triangle? - ANS0.707 x travel What is the pressure of one foot of water head? - ANS. The formula for a perimeter? - ANS2L x 2W Atmospheric pressure pushes downward on the tops of objects, but it does not push upwards on the bottoms of the objects. - ANSf A bitmetal strip is two metals brazed together. - ANSt Wrought iron is a non-ferrous metal. - ANSf Flux inclusions frequently result from the improper feeding of solder into the joint. - ANSt Lines that are equal distant everywhere are perpendicular lines. - ANSf A non-isometric line can be drawn by connecting the two points which lie on different isometric lines. - ANSt In an isometric drawing, an extension or a dimension line can be, but does not have to be, an isometric line. - ANSt The length of an isometric line does not depend upon the selection of the observation point. - ANSf The coil temperature operates the liquid line solenoid valve. - ANSf A grille is the same as a register. - ANSf Air washer systems are used for cleaning direct expansion coils and reheat coils. - ANSf Normally, a water regulating valve is required for a cooling tower installation. - ANSf
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One foot-pound of work equals 778 BTU. - ANSf To take a brazed joint apart, reflux the entire joint area. - ANSf When opening an oxygen cylender valve, it is best to stand to one side of the regulator. - ANSt A fire tube boiler has water around the outside of the tubes being heated by the hot gases within the tubes - ANSt The inverted bucket steam trap can be used to drain condensate from compressed air lines or gas lines. - ANSf Superheated steam can exist by adding more heat to the boiler water. - ANSf As the temperature of the water increases in a hot water boiler, the water absorbs some of the air from the compression tank. - ANSf In a small hydronic heating installation, it is permissible to operate both the burner and the circulating pump off the thermostat. - ANSf A pressuretol is used in connection with controls on a steam boiler. - ANSt A shell and tube type of water-cooled condenser serves as the liquid receiver. - ANSf A cooling tower is more effective as compared to air cooled condensers in climates having low relative humidity. - ANSt The transfer of heat by means of moving substance such as air or water is conduction. - ANSf The O.D. on schedules std., xs, and xxs are the same for a given pipe size. - ANSt Water changing into steam is an example of a chemical change. - ANSf 100 Centrigrade units are equal to 180 Fahrenheit units. - ANSf Argon gas is used as a purge for stainless steel pipe. - ANSt Short term exposure limit (TLV-STEL) is the time-weighted average concentration for a normal 8 hour workday. - ANSf Information about chemical products or hazardous substances must be contained on MSDS. - ANSt What is the purpose of a trestle ladder? - ANSTrestle ladders are not designed to be used as stepladders. They are used to support scaffold planks and for this purpose they are preferred over stepladders. If you should fall you can reduce your chance of injury by falling the right way. - ANSt Excavated material dug out of a trench and placed at ground level is known as spoil. - ANSt Physical and chemical characteristics of the hazardous chemical (such as vapor pressure, flash point) must be contained on a material safety data sheet (MSDS). - ANSt Asbestos is the family name of materials that are an unnatural fiber. These fibers are difficult to break and will fall to the ground, stick to clothes. - ANSf Why should the installation of shoring follow the excavation work as soon as possible? - ANSIt is dangerous to allow trenches to remain unshored even if no work is being done in
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A valve marked only 200 W.O.G. may be used for steam service. - ANSf Valves should be placed in convenient locations free from exposure of being damaged. - ANSt What does the abbreviation ASTM stand for? - ANSAmerican Society for Testing Materials Both hard temper water tube and soft temper water have incised markings. - ANSt Suppressors, while dampening vibration, can also be used to carry some of the weight of the piping. - ANSf All types of valves are available in a complete range of sizes. - ANSf A metering ball valve is a control valve that allows instantaneous selection of any given flow rate within its range. - ANSt What are two advantages of welding pipe? - ANSneatness and compactness The _______- weld is compatible for use with small size piping. - ANSsocket Pipe is made in the following sizes: - ANS1/8" to 48" in diameter Flanges are made in sizes as small as: - ANS1/2" Steel pipe is produced according to standards and specifications by a number of standardizing groups. - ANSt Pressure regulators are used to increase outgoing pressure. - ANSf What is the proper name for FRP materials? - ANSFiberglass reinforced pipe Temperature and pressure are the only considerations which must be considered when installing valves. - ANSf The most widely used copper tube is: - ANSASTM B- 88 Needle-type globe valves are sometimes used for exacting flow regulation. - ANSt The diaphragm on a diaphragm valve is used to seal the bonnet. - ANSt After tightening the nut, on a compression type fitting, handtight, tighten with a wrench: - ANS1 1/4 to 2 1/4 turns The correct angle for most flared fittings in the pipe industry is 30° and sometimes 52°. - ANSf Heat fusion can be used to join the following types of plastic piping materials: - ANSboth PP and PE A union is essentially a pipe coupling. - ANSt Only Schedule ________ PVC and CPVC pipe can be threaded. - ANS Pipe hangers and pipe supports perform the same function of keeping the pipe where it should be. - ANSt A pre-engineered spring hanger does not place a load on the system. - ANSf The most common method of joining copper tube is by soldering with the use of a ________ fitting. - ANScup-joint Head in feet of water column can be converted to pounds per square inch (psig) by dividing the total static head by .433 psig/ft. - ANSf
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The violent flashing and collapsing of vapor bubbles in a centrifugal pump is called ______________. - ANScavitation See Fig. 1. What is the Δ P if the suction gage reads 69.5 psig at position 3 and the discharge gage reads 100 psig at position 4? - ANS30.5 psig The compressor used in medical air systems that insures 100% oil-free air is the __________ piston compressor. - ANSoil-less Storage of water in an automatic water system is in a/an ________ tank. - ANSpressure A pump is a device through which an external source of power is used to apply a force on a fluid. - ANSt Two hydrogen atoms combined with one oxygen atom to make a molecule of ________. - ANSwater A metal which has been annealed has been softened. - ANSt Absolute zero is calculated to be: - ANS-460°F The viscosity of a liquid is reduced as the temperature of the liquid is lowered. - ANSf If it was possible to create a perfect vacuum in the cylinder of a piston pump, water could be raised in the suction pipe to a maximum height of ______ ft., assuming standard atmospheric pressure. - ANS33. A steam boiler operates at 150 psig. What is the absolute pressure (psia) inside the boiler if the barometer reading is standard? - ANS164.7 psia For practical purposes a 13' - 7 3/16" column of water exerts a pressure equal to _______ in. of Hg column. - ANS The ____________ to motion between two bodies in contact is friction. - ANSresistance Water is a compound which consists of one (1) part hydrogen and two (2) parts oxygen. - ANSf A common example of a vacuum at work is a water pump at a well. - ANSt Metals which are brittle will show signs of fault or deformity before falling. - ANSf Reddish-brown iron rust on uncoated cast iron pipe is a form of intergranular corrosion. - ANSf The two proven methods of applying cathodic protection to a buried pipeline are with galvanic cathodes and impressed relative system. - ANSf Local action cells may be responsible for corrosion of buried pipelines that contain asolution which can conduct electricity. - ANSt Since a straight pull is required when using a shackle, how is the eye or hook kept in the center of the pin? - ANSWashers should be placed on each side of the hook or pin. Signal emergency stop if any damage is noticed. - ANSt Regular right-laid rope should be uncoiled in a counter-clockwise direction. - ANSt How many times should seizing wire be wrapped around wire rope to make an adequate seizing? - ANS8 times
