Plumbing and Piping Systems Fundamentals, Exams of Construction

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Pipefitter Star Exam 2024-2025. Real Exam

Questions and Correct, Verified Answers. Graded

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__________ joints are often used for connecting underground lines. - ANSflared _________________ are used to connect copper tube to other types of piping material. - ANSadapter (blank) have a definite volume, but conform to the shape of the container into which they are placed. - ANSliquids (S.U. #26) MA = _______ - ANS (S.U. #8) What is a constant? - ANSA constant is a fixed value 100 Centrigrade units are equal to 180 Fahrenheit units. - ANSf 600WOG ON A VALVE ID PLATE STANDS FOR: - ANSRATED FOR 600 LBS. WATER, OIL OR GAS AT AMBIENT TEMP. A ________ offset is another name for a compound offset? - ANSrolling A ___________ is an arrangement of piping between a steam boiler's header and its gravity-return piping. - ANSHartford Loop A [blank_1] is a device that monitors the amount of current flowing through the hot wire of an electrical load and compares it to the amount of current coming back through the neutral wire. - ANSground fault circuit interrupter

A 4" x 3" wye fitting is used to connect pipe Sections 7, 8 and 9. - ANSt A 60° elbow is sometimes used in combination with a 45° wye to eliminate sharp turns in pipe offsets. - ANSt A bitmetal strip is two metals brazed together. - ANSt A body immersed in fluid loses as much weight as the weight of the fluid it displaces. - ANSt A bushing is not a good replacement for a reducer because they: - ANSOffer more resistance to flow A C-clamp should not be used without a: quick-release lever toggle-lock swivel wrench - ANSswivel A circle is a closed curve all of whose points are on the same plane. - ANSt A common example of a vacuum at work is a water pump at a well. - ANSt A competent journeyworker is one who knows only the technical aspects of the piping trades. - ANSf A competent person means one who is capable of identifying existing and predictable hazards in the surroundings or working conditions which are unsanitary, hazardous, or dangerous to employees, and who has the authorization from the employer to take prompt corrective measures to eliminate them. - ANSt

A compound measurement is one using more than a single dimension to obtain the _______ of a piece of pipe. - ANSlength A condensate pump must be located at the lowest point of the return and as close as possible to the boiler as possible. - ANSt A condensate receiver is used when: - ANSWhen it is impractical to pipe the condensate directly to the boiler A control valve with a direct action actuator and direct trim will: - ANSfail open A convenient tool for measuring the circumference of a pipe is: - ANStape rule A cooling tower is more effective as compared to air cooled condensers in climates having low relative humidity. - ANSt A cooling tower must have a __________ or be open-site. - ANSBackflow preventer A coupling is used to connect two pieces of pipe of different sizes in a straight line. - ANSf A crane shall be loaded beyond its rated load as long as it within 5% of OSHA standards. - ANSf A device that mechanically attachtes to the side of a flange on a beam is called: - ANSBeam clamp A diamond on an instrumentation loop diagram encloses information concerning: - ANSset point A dielectric fitting should be used on: - ANSSteel to copper joints A direct acting thermostat is used to: - ANSIncrease the pressure when the temperature increases

A dry pipe must be used in the design of a boiler to insure the delivery of dry steam. - ANSf A factor to consider in pipe hanger and support systems is: - ANSthe movement of the fluid in the pipe, the temperature of the fluid in the pipe, vibration, (All of the above) A fan coil uses ____ to distribute heating or cooling to the space. - ANSForced convection A FAN COIL USES _______ TO DISTRIBUTE HEATING OR COOLING TO THE SPACE - ANSFORCED CONVECTION A fire tube boiler has water around the outside of the tubes being heated by the hot gases within the tubes - ANSt A flashback is the momentary recession of the flame into the torch tip followed by immediate reappearance or complete extinguishment of the flame. - ANSf A float and thermostatic trap is a: - ANSThermostatic / thermodynamic trap A flux used for soldering and brazing must meet the requirements of ASTM Standard _____. - ANSB A gallon of water at 60 Degrees F weighs: - ANS8.33 lbs A gasket is any formable material, which when clamped between stationary faces, prevent the passage of media across the gasketed connection. - ANSf A grille is the same as a register. - ANSf A Hartford Loop is used for: - ANSProtection for loss of water in the boiler A HARTFORD LOOP IS USED FOR: - ANSPROTECTION FOR LOSS OF WATER IN THE BOILER

A hold down clamp is used to draw the slack out of the chain while on pipe for final tightness. - ANSf A hot water storage tank weighs 975 lb and its capacity is 1,500 gallons of water. How much total weight must be supported by the tank stand? Total Weight = _______ lbs - ANS13, A lamp has a source of 110 volts and current of 0.9 amps, what is the resistance of the lamp? - ANS122. ohms A living room in a house is kept at 70 degrees F. When it is 20 degrees F outdoors, which item(s) below demonstrate heat flowing "downhill"? - ANSheat flows from the indoor air to the outside wall, heat flows from the outside wall to the outdoor air. 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 manufacturing plant has a 3,000 gallon water storage tank 30'-0" high mounted on top of a platform 70'-0" above the first floor. What is the water level in ft. in the tank if the reading on a pressure gage at a location 5'-0" above the first floor is 40 psig? - ANS27. A metal which has a high iron content is known as a _______ metal. - ANSFerrous A metal which has been annealed has been softened. - ANSt A metering ball valve is a control valve that allows instantaneous selection of any given flow rate within its range. - ANSt A mixing valve has ______ inlets and _____ outlets. - ANS2 and 1 A multi-flame heating tip is basically a: - ANSlarge welding tip

A neutral reading on a PH scale is ____________. - ANS7. A non-isometric line can be drawn by connecting the two points which lie on different isometric lines. - ANSt A number value on a pH scale indicates the: - ANSAcidity or alkalinity of a chemical A pin punch should not be used to start driving out a pin because the punch may break. - ANSt A pipe stands 126 feet high and is filled with water. What is the pressure at 30 feet above the bottom? - ANS41 psi A pipe stands 252 feet high and is filled with water. What is the pressure at 30 feet above the bottom? - ANS96 psi A Pop safety valve, that is set to open at 15 psi will close when the pressure is reduced to _______ psi. - ANS A pre-engineered spring hanger does not place a load on the system. - ANSf A pressure gauge at atmospheric pressure is calibrated to read: - ANS0psig A pressuretol is used in connection with controls on a steam boiler. - ANSt A pump is a device through which an external source of power is used to apply a force on a fluid. - ANSt A rating of 150# refers to a flange's: - ANSPressure Rating A RATING OF 150# REFERS TO A FLANGES - ANSPRESSURE RATING

A rating of 300# refers to a flange's: - ANSPressure Rating A retainer pin is located on the main block and is used to stop the chain clamp from kicking up. - ANSt A room containing 2,400 cubic feet is to be ventilated by exhausting air through two grilles. There will be three air changes per hour. What is the (scfm) through each grille? A/G/M = ________scfm - ANS A safety valve is an automatic pressure actuated relieving device for use as a relief valve depending on application. - ANSt A Schematic drawing is: - ANSAll of the above A shell and tube type of water-cooled condenser serves as the liquid receiver. - ANSf A simple example of a lever is: - ANSA pry bar A SINGLE LINE DRAWING OF A PIPING SYSTEM REPRESENTS THE - ANSCENTER OF THE PIPE A single line drawing of a piping system represents the: - ANSCenter of the pipe A sling is weakest in which position? - ANSChoked position A small drop of oil or grease inside an oxygen valve or regulator can cause an explosion. - ANSt 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

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 sub-atmospheric steam heating system is so called because the pressures on the supply side, as well as the return side of the system, are usually operating below atmospheric pressure. - ANSt A system in which the refrigerant is in the shell and cools the fluid in the tubes is: - ANSFlooded A tag line should be used on a crane lift. - ANSAlways A thermocouple: - ANSGenerates a small amount of voltage when heated A THERMOSTATIC STEAM TRAP THAT FAILS IN THE CLOSED POSITION WOULD CAUSE A HEATING UNIT TO BECOME - ANSWATERLOGGED A thermostatic steam trap that fails in the closed position would cause a heating unit to become: - ANSwaterlogged A two-pipe reverse return system should be provided with diversion tees at the roomunit take-offs. - ANSf A type of ladder used to support a scaffold plank is called a trestle. - ANSt A union is essentially a pipe coupling. - ANSt A valve marked only 200 W.O.G. may be used for steam service. - ANSf A valve marked only 220 W.O.G. may be used for steam service. - ANSf A valve's pressure classification is always given in: - ANSpsig

A vapor heated above its corresponding saturation temperature with no change in pressure is: - ANSSuperheated 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 A vent is not needed on a condensate receiver when: - ANSMechanical return is used A VERTICAL LINE IN AN ISOMETRIC DRAWING REPRESENTS - ANSUP AND DOWN A vertical line in an isometric drawing represents: - ANSUp and down A work clamp fastened to the work breaks the welding circuit. - ANSf Absolute zero is calculated to be: - ANS-460°F Add: 5 1/8 + 1 1/4 + 4 ½ = - ANS10 7/ Adhesive used on FRP pipe is very wispy (thin) when it is cool. - ANSf After fittings and tubes are cleaned and fluxed they should be assembled and soldered: - ANSas soon as possible After tightening the nut, on a compression type fitting, handtight, tighten with a wrench: - ANS1 1/4 to 2 1/4 turns Air is eliminated from a vapor steam heating system by a/an: - ANSAir eliminator Air washer systems are used for cleaning direct expansion coils and reheat coils. - ANSf

All of the following are process control elements except: - ANSPiping All planking on scaffold platforms shall be overlapped a minimum of 12 inches or secured from moving. - ANSt All types of valves are available in a complete range of sizes. - ANSf All workers required to enter into confined or enclosed spaces shall be instructed as to the nature of the hazards involved, the necessary precautions to be taken, and in the use of protective and emergency equipment required. - ANSt An air-acetylene torch is not generally recommended for a brazed joint with copper tube larger than ________. - ANS1" An alloy is a substance made up of ________ or more metals. - ANStwo An elbow, often called an ell, makes an angle turn in piping. - ANSt An exit from a trench should be no more than: - ANS25' from any worker An increase in pressure will cause the boiling point of water to: - ANSincrease An increase in pressure will cause the boiling temperature of a liquid to: - ANSIncrease An open rectangular tank measurements are 6' - 6" by 5' - 5" by 5' - 5". How many gallons of water will the tank hold? (Convert the equation to decimal feet rounding to the hundreth place) Capacity = _______ gallons - ANS1428. An oxyacetylene flame has a peak temperature of about _______°F. - ANS

An oxyacetylene flame has a peak temperature of approximately: - ANS6300°F An up-feed steam heating system has the heating units: - ANSAbove the main Annealing copper - ANSSoftens it Anodic protection be used to control corrosion of buried or immersed metallic waterlines and tanks - ANSf Argon gas is used as a purge for stainless steel pipe. - ANSt As an alternative method for pump selection it is more accurate to evaluate the fittings collectively to ensure total equivalent length is achieved. - ANSf As heat is applied, the brazing flux changes to a dry, _________ chalky consistency and then melts into a clear liquid. - ANSwhite As the speed (velocity) of a fluid increases through restriction, the fluid pressure: - ANSdecreases As the temperature of the water increases in a hot water boiler, the water absorbs some of the air from the compression tank. - ANSf As the temperature rises in a closed vessel the pressure: - ANSIncreases 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 Atmospheric pressure pushes downward on the tops of objects, but it does not push upwards on the bottoms of the objects. - ANSf

Balancing valves are not necessary on multi-circuit systems. - ANSf Before a vacuum pump is started, all of the water must be drained from the pump's receiver. - ANSf Before attaching regulators to an oxygen cylinder - ANSBlow the valves for a moment Boilers subject to damage from excessive pressures should be equipped with check valves. - ANSf Both 45° elbows and 22 ¹⁄₂° elbows are being used in Fig. 3. - ANSf Both hard temper water tube and soft temper water have incised markings. - ANSt 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 Brazing and soldering produce hazards such as: - ANSFumes, Gases, Burns, Heat stress, All of the above By observation, Pipe #3 is higher than Pipe #1 in Fig. 3. - ANSt Cables in need of repair may be used, but repaired as soon as possible. - ANSf Cables on drain cleaning machines should be siphoned after each use to prevent damaging effects of drain cleaning compounds. - ANSf Capillary action is used in: - ANSSolder Joints Caps may not be worn under helmets, when welding, to prevent head burns. - ANSf CAST IRON PIPE HAS GOOD RESISTANCE TO - ANSCORROSION, ABRASION,

DEFORMATION

(ALL OF THE ABOVE)

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 Certain fitting and accessories are required by code for boilers to operatr safely and efficiently. What organization is primarily responsible for the development of these codes. - ANSASME Change the following to architectural measurements 3.96': - ANS3' - 11 ½" Check oxyacetylene equipment for leaks using an approved oil free leak detection fluid. - ANSt Chiller units can be located in areas where the air or ambient temperature drop below freezing at the unit. - ANSf Choose the best definition of-ionizing radiation. - ANSRefers to particles and waves transmitted by moving at or near the speed of light. These particles and waves come from the breakup of radioactive elements in their process of becoming more stable, called radioactive decay. When these particles or waves strike atoms or molecules they tear them apart leaving charged particles or ions. Choose the proper order of the two steps for extinguishing the torch flame after cutting or welding - ANSTurn the oxygen preheat valve to the closed position, Turn the fuel gas torch valve to the closed position. Close alignment is not necessary for pumps which have flexible couplings between the motor shaft and the pump. - ANSf Compute the Advance to the nearest sixteenth of an inch on a 45 degree offset if the Travel equals 5'- 1/4". - ANS3'-11 9/16" Compute the Advance to the nearest sixteenth of an inch on a 450 offset if the Travel equals 5'-7 1/4".

A = __________ - ANS3'-11 9/16"

Compute the cross-sectional area, in square feet, of a concrete pipe with an inside diameter of 2' - 6". A = _______ sq ft - ANS4. Compute the grade for a condensate drain which falls 13¹⁄₂" in a run of 72'. G = __________" per foot - ANS3/16" Compute the grade in inches per foot if TF = 3/4" and D = 36" G = ______ per foot - ANS1/ Compute the total fall for a drain line if the grade equals 1/8" per ft. and the length of run (distance) equals 71'. TF = ________ per ft. - ANS8 7/8" Compute the total fall to the nearest eighth of an inch, for a drain line 148' long, installed with a 2% grade. TF = _______ - ANS2' 11 1/2" Compute the total fall, to the nearest eighth of an inch, for a drain line 138 feet long installed with a 2% grade. TF = ________ - ANS2' 9 1/8" Compute the Travel to the nearest sixteenth of an inch on a 45 offset if the Offset equals 3'-6". - ANS4'- 11 3/8" Condensate in steam lines could result in: - ANSWater hammer

Condensate lines should be pitched - ANSIn the direction of flow Confined spaces shall be tested for toxic or flammable gases, dusts, and vapors, and foradequate or excess oxygen before entering and during occupancy. - ANSt Contaminants may enter a refrigeration system because of; hermetic motor failure improper service procedures refrigerant leak any or all of the other three choices - ANSany or all of the other three choices Convert -40 degrees F into C - ANS- Convert .25 feet to an inch measurement. - ANS3" Convert 7/16" to a decimal. - ANS. Convert 9,850 cubic inches to gallons. Gallons = ________ - ANS42. COPPER TUBE IS DESIGNATED AS TYPE(S) - ANSALL OF THE ABOVE (K,M,L) Counter flow arrangement of a water cooled condenser: - ANSexposes the coldest refrigerant to the coldest water, is the preferred arrangement, results in a greater transfer of heat as compared to parallel flow, all of the above Current polarity becomes an important factor with _______ power sources. - ANSAll DC DCRP is produced when the electrode is connected to the positive terminal of the welding power source.

• ANSTrue

Determine the SWL in tons for 1/2" plow steel wire rope slings using the field calculation formula and by measuring H = 5 and L = 8 in Fig. 1. SWL = (Diameter x Diameter x 8) x H / L x 2 - ANS2. Divide: 11 ¼ by 2 ½ = - ANS4 1/ Elements mounted inside of baseboard radiation units located inside of a building near the floor line and against the outside wall are now in common use. - ANSt Employees shall be provided with the particular personal protective equipment necessary to protect them from hazards. - ANSt Excavated material dug out of a trench and placed at ground level is known as spoil. - ANSt Excavations more than 5 feet deep and all excavations in unfractured rock regardless of depth should be exempt from shoring and sloping requirements. - ANSf 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 Exposure to asbestos can be prevented by substituting a product that does not contain asbestos. - ANSt Fier tube and water tube boilers are used as high pressure boilers. - ANSt Fig. 1 is a 60 ° parallel pipe offset with equal spread. Compute C - C measurement D. D = _______________ - ANS24 1/4" C 90° ell-C 60° ell Fig. 1 is a 60 ° parallel pipe offset with equal spread. Compute C -C measurement C and write the measurements in abbreviated form including the fittings. C = ______________ - ANS30" C 60° ell - C 90° ell

Fig. 1 is a 60° parallel pipe offset with equal spread. Compute C - C measurement F. F = __________" C 90° ell - C 60° ell. - ANS31 3/4" C 90° ell-C 60° ell Fig. 2 is a pair of parallel pipe lines with equal spread, offsetting around a column using 45° ells. Compute C - C measurements A and E, write the measurements in abbreviated form including the fittings. - ANSA and E 12" C ell-C 45° ell Fig. 2 is a pair of parallel pipe lines with equal spread, offsetting around a column using 45° ells. Compute C - C measurements B and D, write the measurements in abbreviated form including the fittings. - ANS 3/4" C 45° ell - C 45° ell Find the cross-sectional area, in square feet, of a steel pipe with an outside diameter of 18". A = ____ sq. ft. - ANS1. Find the cross-sectional area, in square feet, of a steel pipe with an outside diameter of 20". A = _______ sq. ft. - ANS2. Find the perimeter of a rectangle whose length is 10.75' and width is 6.25'. - ANS Fire-tube boilers can be built with the tubes in the vertical position. - ANSt Flanges are made in sizes as small as: - ANS1/2" Flashback arrestors eliminate the risk of an explosion in the regulator and cylinders. - ANSt Float traps may be used to vent air or water from vapors or other gas lines. - ANSf Flow control valves are installed in hydronic systems to create gravity circulation. - ANSf

Flux inclusions frequently result from the improper feeding of solder into the joint. - ANSt 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 For practical purposes a 13' - 7 3/16" column of water exerts a pressure equal to _______ in. of Hg column. - ANS Formula to find the offset of a right triangle? - ANS0.707 x travel Fuel gas hose and oxygen hose are not easily distinguishable from each other. - ANSf Gate valves should be used as flow valves, either fully opened or fully closed. - ANSf Globe valves with a screw-down check feature have sliding action between the disc and stem. - ANSt Guides are used near: - ANSAnchors 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 Heat fusion can be used to join the following types of plastic piping materials: - ANSboth PP and PE Heat must be removed from a refrigerant in order for it to ______. - ANScondense Heavy, flame resistant gloves should never be worn to protect your hands for burns, cuts, and scratches, because they are too bulky and can reduce movement. - ANSf Helmets, handshields, and goggles shall be well maintained, and should not be transferred from one employee to another without being cleaned. - ANSt

High silicon iron pipe and fittings are penetrable to acidic food waste. - ANSf Horizontal steam supply piping should be reduced in siz by using: - ANSEccentric reducer (flat on bottom) How can a file become a dangerous tool? - ANSA file can become a dangerous tool when it is used without a handle. How do you figure the area of a Circle? - ANSRadius squared times Pi How far should a copper tube be inserted into a cup for a brazed joint? - ANSAll the way to the shoulder HOW HIGH MUST YOU EXTEND A LADDER ABOVE THE ROOF OR DECK - ANS36" How high must you extend a ladder above the roof or deck? - ANS36" How is the size of ACR copper tube designated? - ANSactual outside diameter How is the size of copper water tube designated? - ANSnominal inside diameter How many Btu are required to change 20 gal of water at 212°F to steam at 212°F? - ANS161,668 Btu How many cubic feet are in a tank that is 24" by 3'-6" by 4'-8" - ANS32. How many cubic inches in a cubic foot? - ANS How many gallons of water per cubic foot? - ANS7. How many GPM must be circulate for every 10,000 BTUH of heat emission on a boiler. - ANS

How many square inches in a square foot? - ANS How many times should seizing wire be wrapped around wire rope to make an adequate seizing? - ANS times How many turns are required to open a closed ball valve? - ANSone quarter turn How many wire rope seizings are required for 1/2" wire rope? - ANS How much does a cubic foot of a substance weigh if its density is 8.4? - ANS8. HOW MUCH HEAT IS REQUIRED TO RAISE 1/2 POUND OF WATER 1 DEGREE F - ANS1/2 BTU How much heat is required to raise 1/2 pound of water 1 degree F? - ANS1/2 BTU How much water is in a tank that is 2' x 3' x 4'? - ANS180 Gallons How often should the atmosphere be tested in a confined space? - ANSContinuously Hydronics is a heating system for a building in which the medium for carrying heat throughout the structure is circulating water. - ANSt Identify the hand signal: <(thumbs pointing out) > - ANSextend boom or trolley out IDLH is an individual's daily level of hazards - ANSf If a gage on a tank reads 38 psig, and the barometric pressure is standard (29.92 in. of Hg) the absolute pressure reading in the tank will be: - ANS52.7 psia

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. - ANS296 If a package liquid chiller is located in a small room, negative mechanical ventilation and even cooling must be provided. - ANSf If a pressure sensor comes very close to registering the actual value of a variable, but is not consistent over the course of several readings, the sensor is said to be: - ANSaccurate If a pump is operating under static suction lift conditions, a __________________ may be installed in the suction line to avoid losing the pump's prime each time the pump shuts off. - ANSfoot valve 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. - ANS33.9 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 IF THE FLOAT IN A F & T TRAP FAILED AND FILLED WITH WATER THE TRAP WOULD - ANSNO CONDENSATE WOULD BE DISCHARGED If the range of a 3 to 15 psig pneumatic transmitter is 50 to 350°F, what is the output signal value, in psig, at 198°F - ANS8.9 If the travel of a 45 degree offset is known, what formula can be used to find the advance? - ANStravel ÷ .707 If you should fall you can reduce your chance of injury by falling the right way. - ANSt Immersing the impeller in the liquid to remove the air from between the impeller blades is known as _________. - ANSpriming

In a bubbler level measuring system, with the open end of the purge pipe at the bottom of the tank, the air pressure in the pipe is _______________ the pressure exerted by the liquid at the bottom of the tank.

• ANSequal to In a constant current welding power source, the welding current remains relatively constant despite considerable changes in __________? - ANSArc length In a float and thermostatic trap the float rises to discharge: - ANSCondensate In a Hydronic heating system, units at the top of the system not heating are likely to be: - ANSAir bound In a non-rising stem valve the stem stays stationary and the disc rides up on the stem. - ANSt In a refrigeration system, a condensable gas is: - ANSAmmonia In a small hydronic heating installation, it is permissible to operate both the burner and the circulating pump off the thermostat. - ANSf In a two pump system, the boiler recirculation should be less than the system circulation. - ANSf IN A TWO-PIPE GRAVITY RETURN STEAM SYSTEM. THE DEVICE THAT PREVENTS RAW STEAM FROM ENTERING THE SYSTEM IS A - ANSSTEAM TRAP In an isometric drawing, an extension or a dimension line can be, but does not have to be, an isometric line. - ANSt In an open Hg manometer the difference in the Hg levels equal 5 in. What is the pressure in psig? - ANS2.5 psig In instrumentation, the term Loop usually identifies: - ANSa combination of two or more inter-connected instruments.

In medical gas installations a purge is required while brazing, along with what percent penetration? - ANS100% In order to close an acetylene pressure regulator, the adjusting screw is turned _____________ until the tension is off the spring. - ANScounter-clockwise In order to keep the float chamber of a low water cutoff clean, it must be blown down on a regular basis.

• ANSt 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 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: - ANS30" In the expansion of liquids, we are concerned only with their increase in: - ANSVolume In the field of process instrumentation, control action is usually initiated by a: - ANSsensor In the U.S. what percent of electricity is produced from power plants using steam? - ANS90% In what ways are steam heating systems classified? - ANSOne pipe and Two pipe system Information about chemical products or hazardous substances must be contained on MSDS. - ANSt Inhalation, ingestion, absorption and injection are four routes of entry. - ANSt Inverter power welding sources provide low electrical efficiency and a slow response time. - ANSt Is copper a ferrous or non-ferrous metal? - ANSnon-ferrous

It is a good idea to lubricate rope occasionally if it is cleaned first. - ANSf It is essential to install a pressure reducing valve on the inlet cold water supply to a boiler water feeder. - ANSf It is impossible to install U-bolt clips incorrectly. - ANSf It is okay to be under a lifted load as long the pilot is able to see you. - ANSf It is permissible to trap a compression tank line. - ANSf It is possible to circulate 160 degree F steam in the supply piping in a variable vacuum steam heating system. - ANSt It is recommended that before you connect to a cylinder valve outlet, "crack" the valve for an instant to clear the opening of dust or dirt particles. - ANSt Jackbars are located on the hold down clamp chain. - ANSt Joint fusion on Fuseal pipe can be accomplished using an automatically controlled power unit. - ANSf Lack of lubrication of a compressor may be caused by: - ANSrefrigerant returning as a slug Ladders with visible defects, such as broken rungs, cracked side rails, or broken steps must be: - ANStagged and removed from service Latent heat is defined as: - ANSamount of heat required to bring about a change in state in a substance Line couplings are slightly longer than merchant couplings. - ANSt

Lines that are equal distant everywhere are perpendicular lines. - ANSf Liquid sight glasses are used on ______ refrigeration systems. - ANSall List four component parts of a hold-down clamp.Chain, Bracket, Hook, Fine adjustment mechanism - ANSChain, Bracket, Hook, Fine adjustment mechanism List the four principle functions of valves. - ANSStart/Stop, Regulate/Throttle, Relief, Reduce Local action cells may be responsible for corrosion of buried pipelines that contain asolution which can conduct electricity. - ANSt Matching taper angles for the spigot and bell on FPP make it possible to mechanically lock a joint by wedging the spigot into the bell. - ANSt mc055-1.jpg The correct measurement for elevation "D" in the drawing below is: - ANS32'-2 11/16" Metals which are brittle will show signs of fault or deformity before falling. - ANSf Moisture in a refrigeration system will cause: - ANSsludge, acids, corrosion, all of the above Most valves are selected on the basis of their application in a piping system. - ANSt MSDS is part of the "right to know" law. - ANSt Multiply: 3 1/5 x 1 ¼ x 1 1/3 = - ANS5 1/3 Name 3 secondary refrigerants: - ANSWater, Brine, Glycol