Refresher 4 - Practical Problems

What is the importance of headwall in a culvert?

to stabilize the embankment and prevent erosion

to prevent flooding, hold water, and measure water flow

to manage the velocity and intercept the water flow

to structurally support the road, embankment, or canal that sit above the culvert

Identify the screwdriver slot "C"
torx

spline drive

pozidriv

hex

Identify the tool #4.

Close Quarters Tubing

Quick Acting

Enclosed Feed Tubing

Screw Feed Tubing

Identify "A" in the figure
Flood level

Mounting height

Flood level rim

Overflow line

What is the most appropriate combination of tool and technique to remove old rusty pipe without damaging the thread?

Pipe wrench with heat application and oil

Chain wrench with light hammering to loosen the joint

Application of soapy water and gradual turning using two wrenches

Adjustable wrench and thread sealant

The following can be a cause for loss of water seal in traps except for _____.

Capillary Action

Evaporation

Oscillation

Vacuum

A kind of fitting used to connect sections of pipe in straight run or riser. Both ends are internally threaded.

socket

face bushing

nipple

hex bushing

What makes Stillson wrench a good tool for pipes?
the smooth jaws secure the nuts and bolts

its jaws are spring-loaded

the set torque level can secure pipes

the movable upper jaw can accommodate different pipe sizes

What tool do you use for threading a very short pipe?
Receding Geared Threader

Nipple Chuck

Hollow Juniper

Pipe Die

What do you call that storage suitable to preserve and care plumbing tools properly?

Tool kit

Tool back

Tool Chest

Tool Chute

What must be the reason why an instantaneous hot water sometimes does not produce hot water?

There is not enough power supply.

The unit needs time to pre-heat water.

The water source is too far from the heater.

There is not enough water flow.

Identify symbol C
Water Closet (Tank-Type)

Urinal (Stall)

Urinal (wall-hung)

Drinking Fountain (Projecting-Type)

How many meals must an eating place serve in a day before it is considered necessary to have an interceptor installed?

200

100

125

150

When using compression fittings to connect plastic to copper pipe, _____ is crucial.

heating of the pipes prior to the jointing

application of teflon tape

usage of solvent cement

deburring of pipe

Slaughtering room and dressing room drains shall be equipped with approved separators. What must the separators be capable of separating? 

blood and oils

scales and innards

bottled fluids

feathers and entrails

Single wall metal vent connectors, shall be provided with clearances from combustible material of not less than ______.

4"

3"

6"

5"

For searching for cable which is broken or lost in line.

Drop Head Auger

Straight Auger

Hook Auger

Retrieving Auger

What is the minimum supply pipe of a GI pipe?
25 mm

20 mm

15 mm

10 mm

What is the most appropriate use for offset pipe wrench?
to extract recessed nipples in walls

to grip and turn nuts and bolts in confined space

to turn overhead pipework in restricted spaces

to change shower valves

Which is not a tool to be used when installing flushometer valve for urinal?

pipe wrench

adjustable wrench

sealant

allen wrench

In a coastal environment, galvanized steel pipe is used for a plumbing system. What would you recommend?

Coat the pipe with epoxy

Replace with stainless steel or other corrosion-resistant material

Apply extra layer of protective coating on the galvanized steel pipe

No change is needed as galvanized steel pipe is acceptable

A worker needs to set-up a heavy steel pipe on a power drive. Which of the work arrangement is the least appropriate?

mounting the power drive firmly to a bench to carry the load

using gloves to secure the end of the pipe for safety against vibration

supporting the heavy end of pipe with pipe support

tightening the pipe in place without any room for movement

DPWH will herald the achievement of the Philippine Government's commitment to reduce carbon emissions by _____ in 2030.

50%

70%

40%

60%

Which of the following is true about CTS?
OD of CTS is always 1/8" larger than ID.

ID of Type M is smaller than ID of Type L.

Type K with nominal size of 2 1/2" has an OD of 2 5/8".

ID of Type K is larger than ID of Type L.

Which component is designed to connect a body harness to the anchorage point?

Anchorage connector

Lanyard

Self-retracting lifeline

Deceleration device

Which of the following fixture connections is a prohibited practice?

A water closet connected to a 4" trap

Installing trap seal primer on floor drains

A drinking fountain with indirect drain

A bar sink draining to an air gap

Which sustainable approach reduces cooling load in a residence?

choosing a high-reflective roof paint

ensuring moisture-tight openings

installing high-powered air conditioners

using roof ventilator

______ is an effective heating medium and is adaptable to almost any type of building.

Oil

Electricity

Steam

Water

This type of vent is commonly used in beauty parlor, barber shop, dental clinic, and operating room.

Looped Vent

Local vent

Utility Vent

Relief Vent

In the figure, there are 3 three-quarter bathrooms. How many P-traps and fixtures are to be installed?

23

21

18

17

In the figure, which of the following is the purpose of "A"?
to neutralize water pressure

to avoid trap seal loss

to avoid pooling of water

to serve as adjunct overflow

Which of the following is incorrect about sediment trap?
sediment trap can be incorporated as part of the appliance

sediment trap can be a tee fitting with a capped nipple in the bottom outlet

sediment trap can be installed on the discharge side of the appliance

sediment trap is installed downstream of the appliance shut-off valve

A rectangular channel with depth of 300 mm and a width of 450mm has average flow velocity of 0.8 m/sec and C = 55. Calculate the gradient.

1:708 m is required

1:750 m is required

1:608 m is required

1:650 m is required

Which of the following is not true about Seasonal Energy Efficiency Ratio?
it is the total cooling output of an air conditioner during its annual usage, in BTU/hr divided by the energy input during the same period

it measures the efficiency of air conditioning systems and heat pumps over an entire cooling season

it is the energy efficiency rating for room air conditioners that lists how many Btu per hour are used for each watt of power it draws

it is the energy efficiency rating for central air conditioners

Shower seat should be built of the following except _____.
all are acceptable

hinged pull-down

removable

spring-loaded

Cracks begin to develop on the pipe joint of a pipe inlet of a pump. What feature can be considered?

anti-corrosion coating

rigid piping material

vibration isolation

pipe anchor and supports

What type of valve is typically used in gas appliances?
pressure-reducing valve

ball valve

gas cock

butterfly valve

A wrong pipe size diameter was installed as the main pipe of the building. What is the best way to proceed?

Replace the pipe diameter as specified in the plans

As long as the pipe size still complies with the hydraulic requirements, a change in pipe size can be accepted

Allow the installation, provided that it passes the water pressure and leak test

Revise the hydraulic computation to justify the installed pipe

What is the recommended faucet for persons with disabilities?
Compression-type faucet

Single lever faucet

Quarter-turn valve

Knob-style faucet

Which of the following is the usual solution in repairing leaks at the base of disc, cartridge and ball type faucets?

put lubricant

replace valve seat

replace washer

replace o-ring

Name that tool which is made of boxwood, dogwood, or lignum vitae, and it is used for dressing or working sheet lead, lead pipe bends, and bath traps.
dresser

turnpin

drift plug

shave hook

What should you use to remove the gloss on the ends of a rigid plastic pipe?

Knife

Steel wool

Sandpaper

Emery cloth

An incorrect fitting was soldered to a copper pipe. What will be the solution to fix this?

reheat the area until the solder melts, and pull the joints apart

cut the pipe in the joint with a tube cutter

wrap the joint with a wet cloth, and strike the joint with a hammer

twist the pipe and fitting, until the solder cracks

Identify "A" in the figure

Vent

Dry Vent

Main Vent

Vent Stack

In a municipality, what might be an advantage if the houses have individual septic tanks instead of a centralized STP?

odor and vermin control

effluent is accessible for water reuse

treatment stages yield to cleaner effluent

low maintenance

Copper and other corrosion-resistant materials are allowed for roof drain. What another material is allowed for roof drain?

Cast iron

Aluminum

Lead

Galvanized iron

What is the practical method of repairing or correcting leak of plastic pipe?
cut and provide bushing

insert additional bigger pipe

replace the pipe

cut and insert coupling

Copper tube and fittings used for drainage and vent piping installed aboveground shall be at least _____.

Type DWV

Type M

Type L

Type K

All Siamese inlet connections shall be located on a street-front of the building and not less than ____ nor more than ____ above the grade and shall be equipped with a clapper-checks and substantial plugs.

0.46 m; 1.22 m

0.9 m; 1.2 m

0.3 m; 1.2 m

0.3 m; 0.9 m

When plastic pipe is joined with cast-iron pipe, which of the following types of joints is acceptable?

Solvent weld

Caulked

Mechanical

Threaded

What is the maximum length of pipe for size 150 mmØ PVC that could freely drain? Assume flow is equals to 15.9 liters per second, 0.9 m/sec velocity and chezy constant at 55. Consider full bore for hydraulic mean.

160 m

140 m

135 m

150 m

A tariff mechanism granted to Maynilad to recover or compensate for fluctuations, as the case may be, in the foreign exchange rates arising from Maynilad’s payment of foreign currency-denominated concession fees and loans

CPIA

FCDA

MBDA

EPA

How many turns does it take to operate a 4" double-disk valve?
15.5

14.5

16

16.5

There are several reasons why soil stacks are not allowed in columns. Which is not the reason?

The size of the columns will be larger

Pipes will interfere with reinforcing Bars

The Gas emitted will deteriorate concrete

Cracks and leaks cannot be detected

To ensure a leak-proof pop-up drain in a hot tub, what should be used?

escutcheon

flat washer

rubber gasket

silicone gasket

What installation method conserves the heat of the water inside a bathtub while in use?

route uninsulated metal piping adjacent to bathtub

ensure the drain and overflow are properly sized

choose a bathtub with large surface area

add fiberglass insulation in or around the body of the bathtub

Galvanized steel pipes are generally measured by its _____. 

Number of threads

Outside diameter

Inside diameter

Developed length

The following ways are to prevent hazards while using power tools, except for one:

Using heavy rubber grips when using heavy jackhammers

Using wrench with sprung jaws so that the wrench will not slip

Not keeping hold on the switch button while carrying a plugged-in tool

Avoiding chisels and wedges with mushroomed heads

What is installed in an area drain to facilitate easier cleaning?
running trap

catch basin

cleanout

valve

The following symbols pertain to a screwed joint, except _____.
C and F

C only

D and F

D only

It gives a multi-sided, secure grip on all hex nuts, square nuts, unions and valve packing nuts.

chain wrench

spud wrench

hex wrench

monkey wrench

In a residential setting, which is prohibited?
Grease Trap

Building Trap

Two-way Trap

Gully Trap

Pilots and burners of gas-fired water heaters (except sealed combustion chambers) in residential garages shall be _______ above the floor level.

24"

12"

6"

18"

To tighten a faucet joint in a confined space under a sink, which tool is the most appropriate?

pipe wrench

adjustable wrench

end pipe wrench

basin wrench

Which type of pipe fitting is used in a drainage system to allow smooth flow of wastewater with minimal resistance?

Side outlet up

Sanitary Tee

Long sweep elbow

Side outlet down

Identify the fitting A

Adapter

Coupling

Nipple

Socket

Identify the Plug Valve.
F

D

E

G

What might be the reason why a hacksaw keeps breaking?

the blade has lost its sharpness

using lower tpi for faster cut

too much pressure is applied on the return stroke

not lubricating the blade

When designing overhead water tanks, which rule applies when determining the size and capacity of cistern compared to the overhead water tank especially when using large capacity overhead tanks.

Cistern is bigger than overhead water tank.

Overhead is the same as cistern.

Cistern is smaller than overhead water tank.

No cistern is needed for large capacity overhead tanks.

In a back-to-back bathroom configuration, how many total valves and faucets should you buy for installation?

10

7

9

11

A residence with 12 family members requires 3.6 cu. meters of cold water daily with peak demand. What is the maximum hot water probable hourly demand?

100 liters

140 liters

110 liters

120 liters

The wetted perimeter and cross-sectional area of a channel is 5 m and 9 sq. m respectively. What is the hydraulic radius of the channel?

1.80 m

2.10 m

0.56 m

1.27 m

What pipe cutter will you use for PVC if you wish to have clean and square cut?

coping saw

hacksaw

hinged cutter

ratchet cutter

Identify C
Bench Chain Vise

Hinged Pipe Vise

Top Screw Bench Chain Vise

Bench Yoke Vise

Which of the following is not used to secure a vessel sink to a countertop?

washer

mounting ring

o-ring

silicone adhesive

Which of the following scenario is inappropriate for hand protection?
gloves for electrical workers shall be made of rubber

gloves shall allow free movement of the fingers

natural or synthetic rubber gloves can be used for handling corrosive substances

gloves shall be worn during operating drills and punch presses

For the temporary accommodation of construction workers, which of the following arrangements is incorrect?

drying area of laundry should be on a sheltered area

kitchen is within the living accommodation

laundry area is within covered space

supply of potable water at least 80 to 180 liters per person per day

What is the suitable gasket material for gas piping?
leather or asbestos composition

sheet rubber or asbestos sheet packing

metallic

rubber or asbestos composition

What is the purpose of toolbox meeting?
to assess work and discuss safety precautions

to conduct training

to delegate work assignment

to hold planning session and discuss site problems for the day

A chilled water pipe is installed with thick insulation under a ceiling slab. What is the appropriate support?

trapeze hanger

pipe clamp

clevis hanger

pipe shoe

Identify the tool G.

Mole wrench

Cutting Pliers

Needle Nose Pliers

Duckbill Pliers

Identify how many are the 4” x 4” x 2” Wye reducer fitting.
7

8

9

10

Approximate capacity of 1" pipe in US gallons per foot is _____.
0.0415

0.0408

0.0416

0.0402

Which installations require a sediment trap?

gas appliances in fireplace, furnaces

tankless water heater, furnaces

gas dryer, boilers

ranges, boilers

Identify "A" in the figure
main vent

drain pipe

waste pipe

soil pipe

A pipe length of 10 m is to be supported at every interval of 1.5 m. How many supports are to be included in BOM?

8

7

9

6

Calculate the gradient required for a 100 mm diameter drain to run half-full at an average velocity flow of 1.2 m/sec. (Take C=55).

1 in 65.5 m would be required

1 in 62.5 m would be required.

1 in 50.5 m would be required.

1 in 52.5 m would be required.

In a back-to-back bathroom configuration, how many tees are used for roughing-in installation?

7

8

9

10

If water closet remains clogged after using an auger, what will be the next step?

Remove the water closet to inspect

Use accordion plunger

Flush with hot and soapy water

Pour chemical drain cleaner

A plumbing design specified a long hot water pipe made of plastic pipe. After months of operation, the pipe started to deform and sag. What could be the problem?

pipe diameter is small

there is no pressure relief installed

there is no expansion joint

pipe jointing is incorrect

It refers to a diagnosable illness whose cause and symptoms can be directly attributed to a specific pollutant source within a building

Building Occupational Illness

Building Exposure Syndrome

Building Related Illness

Sick Building Syndrome

What metering set-up will you recommend for a multi-tenant building?

Install main meter and submeters for each unit downstream.

Install main meter and divide the bill equally among all tenants

Install individual meter to ensure accurate reading for each tenant.

Install main meter and bill each tenants per the number of occupants and unit size.

What material is applied under the flange for installation onto a lavatory and/or sink?

Plumber's putty

Rubber washer

Pipe joint compound

Rubber gasket

The size of the standpipe shall have a diameter of at least 4 inches in buildings in which the highest outlet is _____ above the fire service connection.

23 meters or less

less than 23 meters

more than 23 meters

23 meters or more

To maintain water pressure in all floors of a building/structure, what should be the design of the tank?

The pneumatic tank must have a corrosion-resistant material to avoid cavitation.

A suitable pressure switch shall stop the pump when the cut-in pressure is attained.

The pump is installed before the underground water cistern.

The pneumatic tank shall be designed for twice the maximum total dynamic pressure required.

Minimum supply pipe for lavatory using PPR PN 20 is _____.
25 mm dia.

32 mm dia.

20 mm dia.

15 mm dia.

Which of the following has the least impact on the curing time of solvent cement?

Temperature

Installation orientation

Pipe size

Pipe wall thickness

A type of vent used to provide air circulation to a single fixture trap. 
unit vent

back vent

circuit vent

branch vent

What is the mounting height of bidet to be used by a person with disability?
0.35 to 0.40 m

0.40 to 0.45 m

0.45 to 0.50 m

0.50 to 0.55 m

When threading a galvanized pipe, back off the stock handle _____ turn after each complete turn around the pipe.

1 turn

1/4 turn

2 turns

1-1/2 turns