TLE: 60 Questions with Answer Key

To all Technology and Livelihood Education (TLE) majors out there, here's an 60 items with answer that may be included this March LET Exam 2018. You can copy it for FREE or you can also

download a printable file right HERE. Good luck.

1) A person who installs pipes, fixtures

and other apparatus to convey and

supply water in buildings and to dispose

and discharge waste water.

a. Carpenter

b. Plumber

c. Mason

d. Mechanic

Ans: B

2) It is a receptacle or vault used to

collect organic waste discharged from the

house sewer.

a. Septic tank

b. Manhole

c. Water tank

d. Waste tank

Ans: A

3) The semi-liquid substance

accumulated at the bottom of the septic

tank.

a. Scum

b. Sediment

c. Sludge

d. Silt

Ans: C

4) An underground tunnel that carries off

the drainage and waste matter from a

home or town is called:

a. Drainage system

b. Fixture

c. Sewerage

d. Sewer

Ans: D

5) The pipe that conveys waste from

various fixture other than from the water

closet.

a. Waste pipe

b. Soil pipe

c. Vent pipe

d. Drain pipe

Ans: A

6) It is a fitting or device that provides

liquid seal to prevent the back passage of

air.

a. Loop

b. Fixture

c. Sewer

d. Trap

Ans: D

7) The tools used to tighten or loosen

hexagonal fittings like unions and other

metal fittings.

a. Pipe vise

b. Pliers

c. Wrenches

d. Threader

Ans: C

8) The kind of fitting used to connect fixed

pipe and fixtures is a ________.

a. Wye fitting

b. Coupling

c. Union fitting*

d. Reducer

Ans: C

9) A fitting or device installed at the inlet

of a water pump to prevent backflow of

water.

a. Ball valve

b. Check valve*

c. Blackwater valve

d. Gate valve

Ans: B

10) It is a device installed in water lines

that can be closed or opened to allow

installation or troubleshooting of fixtures.

a. Check valve

b. Gate valve

c. Ball valve*

d. Float valve

Ans: C

11) A schedule 40 pipe is:

a. Thicker than schedule 20

b. Thicker than schedule 80

c. Thinner than schedule 10

d. None among the choices

Ans: A

12) What material is used to seal off

threaded fittings to avoid leakage?

a. Masking tape

b. Teflon tape

c. Scotch tape

d. Adhesive gum

Ans: B

13) What must be installed to prevent

siphonage or backflow of the water seal

in the drainage system?

a. Vent pipe

b. Drain pipe

c. Soil pipe

d. Cleanout

Ans: A

14) Which of the following is NOT

required by the National Plumbing Code?

a. Drainage pipe should be inclined

properly for a downward gravity flow of

water.

b. Drainage pipe should be provided with

adequate cleanout.

c. No vent pipe is needed.

d. All pipe joints must be well-fitted and

tightly connected.

Ans: C

15) What is the ideal inclination of a

horizontal waste pipe as recommended

by the National Plumbing Code?

a. 2% slope

b. 3% slope

c. 4% slope

d. 0% slope or level position

Ans: A

16) For purposes of troubleshooting in

case of stoppage of flow, what must be

installed in the pipe system?

a. Vent pipe

b. Cleanout

c. Drain

d. Tee fitting

Ans: B

17) Plastic pipes are commonly used in

water fixture installation nowadays.

Which of the following is preferred?

a. Polyvinyl chloride (PVC)*

b. Chlorinated PVC (CPVC)

c. Cross-linked polyethylene (PEX)

d. Polyethylene

Ans: A

18) The Plumbing Code on House Drain

provides that there must be no more than

two closets that shall discharge into a

________ pipe diameter.

a. 3 inches or 75 mm

b. 80 mm

c. less than 75 mm

d. 70 mm

Ans: A

19) A metal or plastic fitting used to

connect smaller pipe from a larger pipe.

a. Reducer

b. Elbow

c. Union

d. Coupling

Ans: A

20) As a basic prerequisite for most

plumbing project, what should be

connected for each faucet, toilet, and

fixtures?

a. Fixture shutoffs*

b. Main shutoffs

c. Intermediate shutoffs

d. Valves

Ans: A

21) A plumber wants to tighten and

loosen pipes. Which tool is appropriate?

a. Pipe cutter

b. Flux

c. Pipe wrench*

d. Butane torch

Ans: C

22) A plumber wants to cut metal pipe.

Which tool is appropriate?

a. Hacksaw

b. Back saw

c. Handsaw

d. Drywall knife

Ans: A

23) Metal with semi-rigid auger whose

end is usually fitted with a hook or

corkscrew is called ________.

a. plumber's snake

b. plunger

c. valve

d. bushing

Ans: A

24) If your toilet has trouble, you use

rubber funnel-shape instrument attached

to the end of the handle for unblocking.

What is this tool?

a. plumber's snake

b. valve

c. plunger

d. bushing

Ans: C

25) Which plumbing tool is used for

gripping large pipes and irregular

objects?

a. monkey wrench

b. chain wrench

c. yoke vise

d. pipe wrench

Ans: B

26) A plumber wants to create thread

outside pipe by hand. Which tool is

appropriate?

a. Pipe cutter

b. Pipe threader*

c. Yoke vise

d. Pipe wrench

Ans: B

27) A plumber wants to cut pipes. Which

holding tool is needed?

a. Vise grip

b. Pipe threader

c. Yoke vise

d. Pipe wrench

Ans: C

28) A plumber wants to hold pipe by

hand. What tool is needed?

a. Vise grip

b. Pipe threader

c. Yoke vise

d. Pipe wrench

Ans: A

29) The following are good plumbing

practices, EXCEPT:

a. rainwater harvesting

b. water conservation

c. gray water recycling

d. excessive water consumption

Ans: D

30) Water contaminants are being forced

back into the water piping system. Which

term is referred to?

a. Water flow

b. Back flow*

c. Pressure

d. Harvesting

Ans: B

31) The following are examples of

plumbing fixtures, EXCEPT:

a. water closet

b. drainage

c. shower

d. urinals

Ans: B

32) Which statement is NOT true about

plumbing standards based on Republic

Act 1378 which is known as "Plumbing

Law"?

a. Each fixture directly connected to the

drainage system shall be equipped with a

water-sealed trap.

b. Plumbing shall be designed and

adjusted to use the maximum quantity of

water consistent with proper performance

and cleaning.

c. Water closet must be located in a room

which is properly lighted and ventilated.

d. No substance which will clog the pipes,

produce explosive mixtures, destroy the

pipes or their joints or interfere unduly

with the sewage disposal process shall be

allowed to enter the building drainage

system.

Ans: B

33) A compartment that receives solid or

liquid waste, located below the normal

grade of the gravity system is called

________.

a. septic

b. sump

c. trap

d. interceptor

Ans: A

34) Which is true toxic substance?

a. Hazardous to human health

b. A fixture drain for a laboratory

c. Not hazardous to human health

d. Bedpan washer and sterilizer drain

Ans: A

35) Water that is safe for drinking,

cooking, and personal use is ________.

a. potable

b. purified

c. clean

d. healthy

Ans: A

36) Which among the following best

describes a toilet bowl?

a. A room or booth containing a toilet

b. The Box Type compartment holding

water for flushing the toilet

c. An opening in the wall or ceiling near

d. The device that provides a supply of

water and/or its disposal, e.g. sinks, tubs,

toilet

Ans: B

37) Plumbing ventilation means to

________.

a. carry sewer gas out and relieve

pressure of the drainage system

b. discourage corrosion in the drainage

piping

c. maintain the trap seals

d. give pressure differentials in the public

sewer

Ans: A

38) Rainwater from the roof down to the

ground passes through what pipe?

a. Down spout

b. Conductor

c. Gutter

d. Vent

Ans: A

39) A pipe that conveys only liquid waste

is called ________.

a. vent pipe

b. soil pipe

c. main pipe

d. waste pipe

Ans: D

40) If you install water supply inside the

building, what is the diameter of pipes

needed?

a. 4 inches

b. 1 inch

c. 0.75 inch

d. 0.5 inch

Ans: D

41) In which type of pipes does portable

water travel

a. ABS pipes

b. Galvanized pipes

c. Cast iron pipes

d. PVC pipes (orange)

Ans: B

42) If your water system has leak, where

can you shut off the flow of water?

a. Gate valve

b. Globe valve

c. Check valve

d. Angle valve

Ans: A

43) A plumber wants to install a liquid

seal to prevent sewer gasses from

entering the building. What device is

needed?

a. Union

b. Trap

c. Backflow preventer

d. Pump

Ans: C

44) A plumber wants to shut off the flow

of water just 90 degrees turn. Which valve

is appropriate?

a. Gate valve

b. Globe valve

c. Check valve

d. Angle valve

Ans: B

45) What do you call those flexible

waterproof ribbon for covering threaded

pipes joints to prevent leakage?

a. Rubber bond

b. Masking tape

c. Teflon tape

d. Tape

Ans: C

46) If the end of a PVC pipe is fitted with

a male adopter, what fitting will be used

to stop the flow of the water?

a. Elbow

b. Coupling

c. Cap

d. Plug

Ans: C

47) How many PVC pipes can be installed

in a 7.50 meter distance?

a. 2 pcs.

b. 2.5 pcs.

c. 3 pcs.

d. 3.5 pcs.

Ans: B

48) If the end of the PVC pipe is fitted

with a female adopter, what fitting will be

used to stop the flow of the water?

a. Elbow

b. Coupling

c. Cap

d. Plug

Ans: D

49) A plumber wants to connect two

length of pipes. Which fitting is

necessary?

a. Coupling

b. Elbow

c. Tee

d. Pipe wrench

Ans: A

50) If there is leaking in the water supply

of lavatory, sink, and water closet, which

valve are you going to shut off?

a. Gate valve

b. Globe valve

c. Check valve

d. Angle valve

Ans: D

51) If you install a soil pipe, what is the

standard pitch or slope?

a. 5%

b. 10%

c. 2%

d. 1%

Ans: C

52) If you put source of potable water,

what is the minimum safe distance from

the septic tank?

a. 15 meters

b. 10 meters

c. 5 meters

d. 20 meters

Ans: A

53) No cesspool, septic tank or drain

fields shall be located within how many

meter radius from the well?

a. 15 meters

b. 10 meters

c. 50 meters

d. 45 meters

Ans: D

54) If you plan to drill for a well that can

supply water for public use, what is the

minimum meter radius from a well to the

residences?

a. 150 meters

b. 100 meters

c. 50 meters

d. 200 meters

Ans: B

55) Every trap for bath tubs, lavatories,

sink, and other similar fixture shall be

_________.

a. self-regulating

b. tight

c. fix

d. self cleaning

Ans: D

56) There should be no concrete sanitary

sewers existing within how many meter

radius from the well?

a. 15 meters

b. 10 meters

c. 50 meters

d. 45 meters

Ans: A

57) The standard length of a PVC pipe is

_________.

a. 12 ft.

b. 2.0 m

c. 6.0 m

d. 10 ft.

Ans: D

58) If you want to estimate the number of

G.I. pipes needed from your house to the

main supply, what is the standard length

of a G.I. pipe that you are going to use?

a. 20.0 m

b. 6 ft.

c. 3.0 m

d. 20 ft.

Ans: B

59) If you want to estimate the number of

PVC pipes needed from your house to the

main supply, what is the standard length

of a PVC pipe that you are going to use?

a. 20.0 m

b. 6 ft.

c. 3.0 m

d. 20 ft.

Ans: C

60) All plumbing fixtures must have P-

trap, EXCEPT:

a. lavatory

b. water closet

c. sink

d. bath tub

Ans: A