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General Exams (Plum Practical Db) – Page 4

#61. What is the lead content in a brass fitting?
A 20%
B 25%
C 5%
D 15%
Answer: 5%
#62. A 25 mm diameter water pipe can carry water equivalent to how many 12 mm diameter water pipe?
A 3
B 4
C 5
D 6
Answer: 4
#63. The recommended fall per foot for a 4 in pipe and larger due to impractical depth is
A ½ in per foot
B 5/8 in per foot
C 1/8 in per foot
D ¼ in per foot
Answer: 1/8 in per foot
#64. The recommended fall per foot for a 3 in pipe and larger is _____
A 5/8 in per foot
B ¼ in per foot
C 1/8 in per foot
D ½ in per foot
Answer: ¼ in per foot
#65. In roughing-in for lavatory that is to have an 1-½ in drain, the distance between the fixture trap and the vent is not more than_____.
A 5’-0”
B 10’-0"
C 6’-0
D 3’-0”
Answer: 3’-0”
#66. What is the maximum depth of trench for subsurface drain tile where the soil is to satisfactory absorption?
A 4’-1"
B 1’-6”
C 2’-1
D 3’-0”
Answer: 2’-1
#67. Which type of fire line installation has become obsolete and is seldom used?
A Automatic system
B Dry standpipe
C Wet standpipe
D Wet standpipe and Siamese connection
Answer: Dry standpipe
#68. Generally, what is the standard diameter of the standpipe for buildings two or three stories in height?
A 2 in
B 3 in.
C 4 in.
D 6 in.
Answer: 4 in.
#69. Generally, what is the standard diameter of the standpipe for buildings more than six stories in height?
A 2 in.
B 3 in.
C 4 in.
D 6 in.
Answer: 6 in.
#70. Why is a wet standpipe with Siamese connection considered most practical?
A It is the specification of the fire department.
B It is cheaper type of connection.
C It is being served by the domestic water supply under constant pressure.
D There is no need for the fire department pumper to used.
Answer: It is being served by the domestic water supply under constant pressure.
#71. What is the disadvantage of the wet standpipe with Siamese connection?
A The Siamese connection can obstruct the sidewalk.
B The exposed Siamese connection and pipe can be subjected to vandalism.
C The danger of contamination of the building water supply from the unknown source
D The Siamese connection is expensive.
Answer: The danger of contamination of the building water supply from the unknown source
#72. What is the most practical method of repairing or correcting leak of a plastic pip
A Replace the pipe
B Insert additional bigger pipe
C Cut and insert coupling
D Cut and provide bushing
Answer: Cut and insert coupling
#73. Careful installation of the water supply distribution is essential. Which statement differs among the group?
A Sufficient grade and proper alignment
B Adequate size
C Short offsets and unnecessary fittings
D Careful installed connections
Answer: Short offsets and unnecessary fittings
#74. Damage to property leaking points, trapped piping and water hammer in a water system are attributed to ____.
A Poor planting
B Poor materials
C Poor design
D Poor workmanship
Answer: Poor workmanship
#75. In what ways must the water distribution system be suspended from the basement ceiling in large concrete buildings?
A Using wooden plugs
B Using lead pipings
C Iron inserted on the tough floor sheating and slushed into the concrete slab
D Using eye log bolts
Answer: Iron inserted on the tough floor sheating and slushed into the concrete slab
#76. What is that it is not good practice to use a gate valve on a lawn sprinkler?
A It is expensive.
B It is hard to operate.
C It will fail to close tightly.
D It is bulky.
Answer: It will fail to close tightly.
#77. 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 entire water system.
C To eliminate the danger of property damage.
D All of the above
Answer: It is convenient to provide a drum valve to make it possible to drain the entire water system.
#78. Where should gate valve be used?
A At the midpoint between the corporation stop and the curb stop.
B In between the main supply line and pump line.
C After the water meter.
D After the entrance of the street water main.
Answer: In between the main supply line and pump line.
#79. What is the recommended distance above the flood level rim of a unit for a vacuum breaker to be installed?
A 4 in
B 6 in
C 8 in
D 10 in
Answer: 6 in
#80. In what instances that a mechanical drainage will be used?
A The volume of sewage is excessive.
B Pump or ejectors are readily available.
C Drainage cannot be affected by gravity.
D Building is provided with basements and subbasements.
Answer: Drainage cannot be affected by gravity.
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