Plumbing Certification

Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is the standard pressure range for a pneumatic signal?
Ammonia
Argon
tangent 1/2 angle x radius
3 to 15 psi


2. Theoretically - a pump can raise water by suction approximately __________ feet vertically.
Strainer
Argon
34 feet
Flashing


3. What causes water to move in a Hydronic system?
Pressure rating
Above the main
To allow for thermal movement
The pump creates a differential in pressure that moves the water.


4. What is the sum of all angles in a triangle?
Purge the line when brazing
Raise the load
Set point
180


5. OD for 1/2'(inch)

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6. Use of air as a power source is known as...
Pneumatics
Pipe strain
1.25'(inch)
Vaporization


7. What size hole should be cut into a main to saddle IN a smaller pipe?
The same OD as the branch
Loosen the far bolts first
Quarter
2nd gear divided by primary gear. Example: A machine has a primary pulley of 6'(inch) and a secondary pulley of 24'(inch). Formula is 24/6=4 - so the ratio is 4 to 1


8. What is the formula to calculate thermal expansion?

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9. The symbol for pi is equivalent to...
5ft - the 4 to 1 rule - every 4 feet high the base must move 1 foot back.
Saturated
3.1416
dry expansion


10. The best knot to use when lifting pipe vertically is the...
Divide the diameter by half 4 times - put the 2nd and 4th number together to get the answer. Example - 6'(inch) 45 would be - 6 - 3 - 1 1/2 and 3/4. Answer 3 3/4'(inch)
Loosen the far bolts first
.707
Clove hitch with a half hitch


11. How much does 1 cubic foot of air weigh?
Air Bound
.075lbs
Flat and horizontal positions
Spring hanger


12. The proper way to extinguish a fire is to...
Multiply the specific weight by the weight of 1 cubic foot of water which is 62.4lbs. Specific weight x 62.4 = 1 cu ft weight. Example: Specific weight = 4.8 - 4.8 * 62.4 = 299lbs per cu ft
Eccentric reducer (flat on top)
Point at the base and sweep the base with the extinguisher
Point thumb up


13. What is the welding position 3 - on the electrode mean?
Flat position only
steam and condensate flowing in the same direction
Positive
15 PSI


14. The leading cause of on-the-job deaths in the construction industry is _______________.
3.1416
Cavitation
Set up opposite bolts fairly tight - then tighten all bolts equally for inspection purposes.
falls


15. What is the formula to figure take off on a 45 degree elbow?

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16. In a Hydronic heating system - units at the top of the system not heating are likely to be...
Tagged and removed from service.
Air Bound
galvanized
4 1/2'(inch)


17. The color code for type M copper is...
Never
Red.. think M&M is RED
dry expansion
1.5


18. Zinc chills or metal fume fever are caused from welding on __________ steel.
Conduction - convection and radiant.
galvanized
1:48 - because 1/4 of an inch is 1/48th of a foot
Sensor


19. Which type of orifice plate is designed to measure flow of liquids containing solids?
Segmental
Spiral
The Evaporator
.135 cu ft


20. One pound of water pressure is equal to...
231
2.31ft
Too fast of a travel rate
In a pressure gauge


21. An exit from a trench should be no more than...

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22. OD for 3'(inch)

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23. In a typical residential air condittioning system - the evaporator is of the _______________ type - where the liquid refrigerant should be totally vaporized before it reaches the outlet of the evaporator.
dry expansion
4 times
Latent
Strainer


24. Which of the following types of copper tube has the smallest wall thickness?
DWV
Fuel - Heat - Oxygen
Pressure rating
Hazard prevention and control.


25. What are the three types of steam traps?
1:48 - because 1/4 of an inch is 1/48th of a foot
Blue... think b-LLLLue
Capillary action
Thermostatic - Thermodynamic and Mechanical


26. 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.
foot valve
Pneumatics
34 feet
Green... think KKelly GREEN


27. What is the purpose of the oxygen and acetylene regulators?
1.5
To reduce the pressure from the cylinders to safe and workable pressures
Globe valve
Snubber


28. When should a person designated as an attendant attempt to rescue a worker that is trapped?
radius squared times PI
Never
Expansion = Constant per 100ft multiplied by (Final Temp- Starting Temp) Example: 380' steel pipe (.0305 constant) is heated from 62 degrees to 171 degrees - how much did the pipe expand? Formula: .0305 * 3.8 (171-62) = 3 5/16'(inch)
dry expansion


29. Which of the following is NOT a reason to use stud bolts instead of machine bolts for bolting flanged piping joints?
Insure progressively tighter fit
return fitting
The stud bolt is stronger than a machine bolt of the same size and material.
In a pressure gauge


30. How high must you extend a ladder above the roof or deck?

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31. A guard rail system must withstand a minimum force of __________ pounds.
Strainer
200 lbs
Water
Eccentric reducers - flat on top


32. What is capillary action?
Remote bulb
The flow of a liquid into a small space
10 feet
Flat position only


33. One cubic foot of water weighs?
Set point
62.4 pounds
Thermostatic - Thermodynamic and Mechanical
Sch 40


34. How often should the atmosphere be tested in a confined space?
tangent 1/2 angle x radius
Continuously
The flow of a liquid into a small space
All position


35. The color code for type K copper is...
Green... think KKelly GREEN
Snubber
14'(inch)
Flooded


36. When brazing for medical gas or refrigeration always...
Multiply the length of the hypotenuse of the roll and the set by 1.414
Purge the line when brazing
The science of heat transfer using water.
Axis of pipe should be on a 45 degree


37. Why can flux be omitted in a brazed joint?
sewage
Expansion = Constant per 100ft multiplied by (Final Temp- Starting Temp) Example: 380' steel pipe (.0305 constant) is heated from 62 degrees to 171 degrees - how much did the pipe expand? Formula: .0305 * 3.8 (171-62) = 3 5/16'(inch)
lower hook
The flux is in the filler material


38. The density of water is...
Vaporization
62.4
Dry expansion type
cool and lubricate the die


39. When changing pipe sizes in the horizontal supply or return lines of a two-pipe hot water heating system use...
Eccentric reducers - flat on top
To protect the threads from rust.
.7854 x D squared
bowline on a bight


40. When leaning a ladder against an object - the ladder should be at an approximate angle of __________ degrees.
Remove the packing
75 degrees - also 4 to 1
Pipe penetration
ALWAYS


41. When a liquid changes immediately to a vapor it is called...
pi * radius squared
After cutting
Equalizing line
Flashing


42. When using a cable come-a-long - what safety device will indicate overloading?
Not to scale - does not show locations of equipment. It shows pipe size and flow.
Divide the diameter by half 4 times - put the 2nd and 4th number together to get the answer. Example - 6'(inch) 45 would be - 6 - 3 - 1 1/2 and 3/4. Answer 3 3/4'(inch)
handle will bend
250 degrees


43. What should be done to prepare a flange for the gasket installation?
Sensor
Sch 40
Remove any paint or rust.
1.5


44. If the travel of a 45 degree offset is known - what formula can be used to find the advance?
To reduce the pressure from the cylinders to safe and workable pressures
.01745 - 3.1416 - and .7854
.707 x Travel
galvanized


45. What does GFCI stand for?
Climbing the cross braces.
Ground Fault Circuit Interrupter
Material Safety Data Sheet
.625


46. When is it safe to remove the old packing from a valve that is under pressure?
supporter of combustion
NEVER!
maximum rated capacity
All position


47. When a soldered joint is overheated...
no valves permitted
Too fast of a travel rate
The flux burns and the joint becomes ineffective
14.7psia - always in PSI-A


48. A gallon of water weighs...
Multiply the specific weight by the weight of 1 cubic foot of water which is 62.4lbs. Specific weight x 62.4 = 1 cu ft weight. Example: Specific weight = 4.8 - 4.8 * 62.4 = 299lbs per cu ft
To chemically prepare the pieces for soldering
Mechanical return is used.
8.33lbs


49. Which of the following is NOT a reason for using cutting oil when threading pipe?
To protect the threads from rust.
75 degrees - also 4 to 1
Expansion loop.
Pressuretrol


50. The color code for ACR copper is...
14.7 psia
Valve
Crimson... think aCRimson
Discharge