Page 1 Practical Problems
PRACTICAL PROBLEMS Select the correct answer for each of the following questions. Mark only one
INSTRUCTION:
answer for each item by encircling the letter of your choice. STRICTLY NO ERASURES ALLOWED. TIME ELEMENT:
1.5 hours
MULTIPLE CHOICES:
1. As an experienced plumber, what is the recommended size of the drain serving water closet? a.
3 inches
c.
5 inches
b. 4 inches
d.
6 inches
2. A red spiral line painted on a pipe section identified the pipe as ________. a.
Cast Iron pipe
c.
Copper pipe
b. Wrought-Iron pipe
d.
Brass pipe
3. A brewery plant requires a piping system to convey beer, ale, spirituous liquor and distilled water. What kind of pipe to be used? a.
Black Tin pipe
b. Copper pipe
c.
Cast Iron pipe
d. Terra-cotta pipe
4. A hotel requires hot and cold water supplies. What kind of pipe is best suited? a.
Cast Iron pipe
b. Copper pipe
c.
Galvanized Wrought-Iron pipe
d. Plastic/Synthetic pipe
5. A registered master plumber is consulted to install piping system for water, gas, steam and oil. What kind of pipe is recommended? a.
Cast Iron pipe
b. Plastic pipe
c.
Lead pipe
d. Wrought-Iron pipe
6. What kind of pipe to be used where heating panels are considered in concrete slabs for t he purpose of melting snow? a.
Plastic pipe
b. Wrought-Iron pipe
c.
Lead pipe
d. Terra-cotta pipe
7. When cutting pipe that coated internally with enamel o r glass, delicate core should be taken to avoid cracking or chipping the internal coating. What kind of too l that should never be used for cutting such pipe? a.
Adjustable Hacksaw
b. Pipe reamer
c.
Wheel pipe cutter
d. Square-edge pipe cutter
8. When a very short pipe is threaded. W hat will you see? a.
Hollow jumper
b. Nipple chuck
c.
Solid jumper
d.
Pipe tong
9. What is that tool used for expanding the ends of lead pipe? a.
Shave hook
b. Turn pin
c.
Drift plug
d.
Dresser
10. When using an extension ladders, what will be the maximum sliding sections allowed? a.
2 ½ sliding sections
Prepared by: Engr. Jarick Acosta, CE, RMP
c.
3 ½ sliding sections
Page 2 Practical Problems
b. 2 sliding sections
d.
3 sliding sections
11. An 8 meters aluminum ladder is used in delivering plumbing fixtures to the second the foot of the ladder be placed from the wall of the building? a.
2 meters
b. 2 ½ meters
c.
3 meters
d.
3 ½ meters
12. As registered master plumber, you have to use a ladder to carry the pipes to the second floor of the building, what will be the horizontal distance from the foot o f the ladder to the wall that you considered proper? a.
¼ of the ladder’s length
b. 1/3 of the ladder’s length
c.
½ of the ladder’s length
d.
3/8 of the ladder’s length
13. What is that valve recommended for installations that call for throttling? a.
Globe valve
b. Gate valve
c.
Check valve
d.
Angle valve
14. What is the approximate height above the floor level of a kitchen sink? a.
30 inches
c.
36 inches
b. 34 inches
d.
38 inches
15. What is the approximate height above floor level of a built-in bathtub floor level? a.
12 inches
c.
18 inches
b. 16 inches
d.
24 inches
16. What is that device used to support the water supply riser? a.
Pipe rest
c.
Iron insects
b. Iron ring
d.
Eye log bolt
17. What is that fitting necessary in a wat er supply system which is used to the w ater supply in some portion of the installation? a.
Meter stop
b. Valve
c.
Curb stop
d.
Corporation stop
18. What kind of valve is suited for the m ain water supply lines and pump lines? a.
Angle valve
b. Gate valve
c.
Globe valve
d.
Check valve
19. Generally, the registered master plumber must be systematic in connecting the riser branches to the main of the water supply system. What will be the right angle of all branches connection to the main? a.
30
c.
60
b. 45
d.
90
20. What do you call the plugging of an opening with o akum, lead or other materials which are pounded into place or materials pounded into the opening? a.
Caulking
c.
Stopping
b. Plugging
d.
Closing
21. The material used to join or connect plastic pipe is called? a.
Lead
b. Flux
c.
Solder
d.
Solvent cement
22. What is the minimum length of time before a jointed plastic pipe be subjected to pressure test?
Prepared by: Engr. Jarick Acosta, CE, RMP
Page 3 Practical Problems
a.
1.5 hours
b. 2 hours
c.
2.5 hours
d.
3 hours
23. In bending plastic pipe, what will be the pr actical material to be used to preve nt fattening of the pipe? a.
Sand
b. Gravel
c.
Water
d.
Metal spring
24. What is that part of the piping of a plumbing installation which supplies the plumbing fixtures with an adequate flow of water? a.
Soil and vent piping system
b. Domestic hot water piping system c.
Domestic water distribution system
d. Water and waste piping system 25. What is the usual horizontal length that the cast iron be supported to prevent damage at joints caused by sagging? a.
1.25 meters
c.
1.75 meters
b. 1.50 meters
d.
2.00 meters
26. What is the name of the instrument which used in caulking oakum in the joints of cast iron pipe? a.
Iron rod
c.
Chisel
b. Yarning iron
d.
Angle bar
27. What will be provided to prevent contamination from the polluted water of the fire truck to the house water supply system? a.
Gate valve
b. Check valves & gate valve
c.
Water main stop
d.
Water meter stop
28. On what type of building are wet standpipes generally used? a.
Tall building
b. Large building
c.
Very tall building
d.
Smaller building
29. Fire system piping is usually painted with? a.
Red color
c.
Green color
b. Yellow color
d.
Blue color
30. What is that feature which offers a convenient water supply for firemen, making it necessary for the fire department to transport and user much expensive fire fighting apparatus? a.
Stand pipe
b. Fire truck ladder
c.
Fire truck
d.
Overhead water tank
31. What is the device which is to be installed on the water service between the edge of the street and the sidewalk line which serves as a control valve in case water supply is cut-off to the building? a.
Curb stop
b. Meter stop
c.
Gate valve
d.
Corporation stop
32. What circumstances should the curb stop is used? a.
When the water has to be controlled.
b. When the pressure is excessive. c.
When the water pressure is low.
Prepared by: Engr. Jarick Acosta, CE, RMP
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d. When the water pressure can cause flooding. 33. Why is it that corporation stop re quired when the main water pipe is tapped with pressure on? a.
It serves as a meter.
b. It serves as a pressure balancer. c.
It serves as a control stop.
d. It serves as a shut-off when water is excessive. 34. It is essential that pipe threads be cut accurately to ensure that threads for fittings will be universal so that the manufacturers of pipe threading equipment follow the American Standard. How many threads per inch for pipes having a diameter of 3 inches/ 4 inches/ 5 inches? I. 3-inch diameter? a.
5
c.
14
b. 8
d.
18
5
c.
14
b. 8
d.
18
5
c.
14
b. 8
d.
18
II. 4-inch diameter? a.
III. 5-inch diameter? a.
35. The allowable tensile stress of wrought iron steel pipe is 750 psi. It is to be used for hot water supply with a working pressure of 300psi. What schedule of the pipe should you specify? Use the formula: N
100 P
Where: N = schedule number
S
a.
P = service pressure in psi S = allowable tensile stress in psi
20
c.
60
b. 40
d.
80
36. A schedule of 80 wrought iron pipe c an withstand a steam pressure up to? a.
125 psi
c.
600 psi
b. 200 psi
d.
500 psi
37. A wrought iron pipe schedule 40 can withstand a steam pressure up to? a.
125 psi
c.
250 psi
b. 200 psi
d.
300 psi
38. 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. a.
Turn pin
b. Dresser
c.
Shave hook
d.
Drift plug
39. What is that handy tool for threading the end of the pipe in a trench or in the corner of a cellar where a pipe projects too far and threaded in place? a.
Ratchet stocks
b. Taps
c.
Single wheel pipe threader
d.
Geared pipe threader
40. In the trade of piping, the term “tapping” is used to describe_____. a.
Drilling of holes through metal c.
Prepared by: Engr. Jarick Acosta, CE, RMP
Cutting of internal threads
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b. Smoothing of ridges
d.
Joining of lead pipes
41. A pipe vise is needed to? a.
Keep pipe rigid for cutting
b. Straightened a tapered tap in a hole c.
Expands the ends of the lead pipe
d. Retain melted lead in a joint 42. In a certain plumbing installation, a lead pipe is being used. How do you usually join the lead pipe? a.
Melting the pipe ends
b. Threading the pipe ends
c.
Tapping the pipe ends
d.
Reaming the pipe ends
43. What should be the maximum length of the ladder w hen fully extended of an extension ladders? a.
40 feet
c.
60 feet
b. 50 feet
d.
70 feet
44. What is usually the primary cause of troubles in e xcavating operations for water pipes? a.
Inadequate drainage
c.
Lack of shoring
b. Underground utilities
d.
Stagnant water
45. What will be the maximum water se rvice pressure at the point where the building distribution system begins? a.
80 psi
c.
100 psi
b. 90 psi
d.
120 psi
46. What is the suitable gasket material for a flange union in oil lines? a.
Rubber or asbestos sheet
b. Rubber or asbestos composition c.
Metallic or rubber composition
d. Metallic 47. What is the suitable gasket material for a flange union in cold water piping? a.
Rubber
c.
Metallic
b. Leather
d.
Asbestos
48. What is the suitable gasket material for flange union in gasoline conduction? a.
Rubber or asbestos sheet
b. Rubber or asbestos composition c.
Metallic or rubber composition
d. Metallic 49. What is the smallest plumbing fixture used as the basis in determining the fixture unit value? a.
Lavatory or wash basin
b. Floor drain
c.
Water closet
d.
Kitchen sink
50. As an experienced registered master plumber, what will be the ideal size of the P-trap that should be installed underground or embedded on a concrete slab? a.
100 mm
c.
200 mm
b. 150 mm
d.
250 mm
Prepared by: Engr. Jarick Acosta, CE, RMP
Page 6 Practical Problems
51. A 100mm x 3.0m plastic pipe is used to install in house drainage. The face-to-face distance is 4.40 meters. The engagement length is 45mm and the solvent cement per jo int requires is 16 grams. I. Determine the number of pipes. a.
1.47
c.
1.62
b. 1.74
d.
1.15
II. What is the amount of solvent in grams? a.
32
c.
64
b. 48
d.
75
III. If the cost of solvent cement is 80.00php per gram. What is the total cost of solvent cement? a.
2,560.00php
c.
5,120.00php
b. 3,840.00php
d.
6,000.00php
52. What condition must be satisfied for the water supply in building? a.
Fast removal of the waste with a minimum probability of leakage and stoppage of drain.
b. Fixtures should be vented to avoid siphonage or backflow. c.
The drainage pipe should be graded properly for downward gravity flow of water towards the discharge point.
d. Supply sufficient amount of water to each fixture and pre vent backflow to avoid contamination. 53. Each fixture in the Plumbing system represents a certain demand for water, what is the water demand of the wall hydrant? a.
3 gpm
c.
8 gpm
b. 5 gpm
d.
9 gpm
54. Each fixture in the Plumbing system represents a certain demand for water, what is the water demand of the bathtub faucet? a.
2 gpm
c.
4 gpm
b. 3 gpm
d.
5 gpm
55. Each fixture in the Plumbing system represents a certain demand for water, what is the water demand of a shower head? a.
1 gpm
c.
3 gpm
b. 2 gpm
d.
4 gpm
56. Each fixture in the Plumbing system represents a certain demand for water, what is the water demand of the sink faucet? a.
1 gpm
c.
3 gpm
b. 2 gpm
d.
4 gpm
57. Each fixture in the Plumbing system represents a certain demand for water, what is the water demand of the drinking fountain? a.
1/2 gpm
c.
3/4 gpm
b. 2/3 gpm
d.
4 gpm
58. What is the name of that piece of pipe less than 12 inches in length threaded on both ends? a.
Short pipe
b. Cut pipe
Prepared by: Engr. Jarick Acosta, CE, RMP
c.
Pipe
d.
Nipple
Page 7 Practical Problems
59. What do you call that short pipe whose t hread at both ends meet? a.
Close nipple
c.
Shoulder nipple
b. Short nipple
d.
Long nipple
60. What do you call that pipe whose thread at both ends leaves a small amount of space? a.
Cut pipe
b. Long pipe
c.
Short pipe
d.
Stack
61. What is the minimum nominal diameter of a water service line pipe which will provide the building with water requirements during peak demands? a.
¼ inch
c.
1/3 inch
b. ½ inch
d.
¾ inch
62. What is the tin content in a brass fitting? a.
5%
b. 10%
c.
20%
d.
25%
63. What is the zinc content in a brass fitting? a.
25%
c.
10%
b. 20%
d.
5%
64. What is the lead content in a brass fitting? a.
5%
b. 10%
c.
15%
d.
20%
65. What is the copper content in a brass fitting? a.
80%
c.
90%
b. 85%
d.
95%
66. A 25mm diameter water pipe can carry water equivalent to how many 12mm diameter water pipe? a.
3
c.
5
b. 4
d.
6
67. The recommended fall per foot for a 4-inch pipe and larger is______. a.
1/2-inch per foot
c.
1/4-inch per foot
b. 5/8-inch per foot
d.
1/8-inch per foot
68. The recommended fall per foot for a 3-inch pipe and smaller is _____. a.
1/2-inch per foot
c.
1/4-inch per foot
b. 5/8-inch per foot
d.
1/8-inch per foot
69. In roughing-in for lavatory that is to have an 1 ½-inch drain, the distance between the fixture trap and the vent is not more than ______. a.
10’ – 0’’
b. 6’ – 0’’
c.
3’ – 0’’
d.
5’ – 0’’
70. What is the maximum depth of trench for sub-surface drain tile where the soil is of satisfactory absorption? a.
4’ – 1’’
c.
2’ – 1’’
b. 1’ – 6’’
d.
3’ – 0’’
71. Each fixture in the plumbing system represents a c ertain demand for water. What is the wate r demand of the water closet tank ball cock?
Prepared by: Engr. Jarick Acosta, CE, RMP
Page 8 Practical Problems
a.
3 gpm
c.
1 gpm
b. 2 gpm
d.
4 gpm
72. Which type of fire line installation has become obsolete and is seldom used? a.
Automatic system
b. Wet standpipe
c.
Wet standpipe with Siamese connection
d.
Dry standpipe
73. Generally, what is the diameter of the standpipe for buildings two or three stories in height? a.
4 inches
c.
3 inches
b. 6 inches
d.
2 inches
74. Generally, what is the standard diameter of the standpipe for buildings more than six stories in height? a.
4 inches
c.
3 inches
b. 6 inches
d.
2 inches
75. Why is a wet standpipe with siamese co nnection considered most practical? a.
It is the specification of the fire department
b. There is no need for the fire department pumper to used c.
It is the cheaper type of connection
d. It is being served by the domestic water supply system under constant pressure 76. What is the disadvantage of the wet standpipe with siamese connection? a.
The danger of contamination of the building water supply from the unknown source
b. The siamese connection is expensive c.
The exposed siamese connection and pipe can be subjected to vandalism
d. The siamese connection can obstruct the sidewalk 77. What is the practical method of repairing or correcting leak of a plastic pipe? a.
Cut and insert coupling
c.
Cut and provide bushing
b. Insert additional bigger pipe
d.
Replace the pipe
78. Careful installation of the water supply distribution is essential. Which statement differs among the group? a.
Sufficient grade and proper alignment
b. Short offsets and unnecessary fittings c.
Carefully installed connections
d. Adequate size 79. Damage to property leaking points, trapped piping and water hammer in a water system are attributed to ______. a.
Poor workmanship
b. Poor design
c.
Poor materials
d.
Poor planting
80. In what ways must the water distribution system be suspended from the basement ceiling in large concrete buildings? a.
Using lead pipings
b. Using wooden plugs c.
Using eye log bolts
d. Iron inserted on the tough floor sheat ing and slushed into the concrete slab 81. Why is that it is not good practice to use a gate valve on a lawn sprinkler?
Prepared by: Engr. Jarick Acosta, CE, RMP
Page 9 Practical Problems
a.
It is expensive
b. It is bulky
c.
It will fail to close tightly
d.
It is hard to operate
82. Why must basement water supply must be properly graded and aligned? a.
To pitch the water lines to one low point
b. It is convenient to provide a drum valve to make it possible to drain the e ntire water system c.
To eliminate the danger of property damage
d. All of the above 83. Where should gate valve be used? a.
In between the main supply line and pump line
b. After the water meter c.
After the entrance of the street water main
d. At the midpoint between the corporation stop and the curb stop 84. What is the recommended distance above the flow level rim of a unit for a vacuum breaker t o be installed? a.
6 inches
c.
9 inches
b. 4 inches
d.
12 inches
85. In what instances that a mechanical drainage will be used? a.
The volume of sewage is excessive
b. Pumps or ejectors are readily available c.
Building is provided with basements and sub-basements
d. Drainage cannot be affected by gravity 86. What kind of pipe usually used as leaders in tall buildings? a.
Wrought iron pipe
b. Plastic pipe
c.
Copper pipe
d.
Cast iron pipe
87. What will be the best kind of pipe for underground drains within the buildings? a.
Cement pipe
b. G. I. pipe
c.
Cooper pipe
d.
Cast iron pipe
88. The drainage system in the building should be designed, constructed and maintained as to guard against fouling, deposits of solids and clogging. What feature should be provided to make maintenance efficient and effective? a.
Adequate cleanouts
b. Adequate water seal traps
c.
Adequate vent pipes
d.
Adequate water supplies
89. Why is that rainwater leaders are often not included as part of t he sanitary drainage system? a.
Not to overload the sewerage system
b. Rainwater has no cleansing effect c.
Volume of water is unpredictable
d. Excessive rainwater hinders the treatment of the sewage 90. Which word does not apply to the plumbing system? a.
Smoke tight
b. Air tight
Prepared by: Engr. Jarick Acosta, CE, RMP
c.
Water tight
d.
Gas tight
