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10 Cards in this Set
- Front
- Back
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Drain traps serve which of the following purposes:
i) to seal the outlet fixture ii) to prevent back flow of sewer gas iii) to deflect grease and oil for separate disposal a) ii) only b) i) only c) both i) and iii) d) both i) and ii) e) i), ii) and iii) |
D
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Which of the following has a trap as an integral part of the fixture? a) water closet b) sink c) storm drain d) sewer e) sump pump |
A
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Sewer smells coming from a floor drain in a washroom can be a problem if the floors of the washroom are not cleaned often. Which of the following courses of action is the simplest way to stop the smell from coming out of the drain? a) Pour a pail of water in the drain. b) Cover the drain opening. c) Sanitize the washroom. d) Flush the drain with caustic soda. e) Improve the washroom's ventilation. |
A
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Negative pressure in a drainage system may result in which of the following problems? a) clogging of drain pipes b) scale of build-up in water closets c) drawing out of sealing liquids in traps d) forcing of sewer gases through traps e) collection of sediment in drain traps |
C
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Which of the following statements is true? a) Branch line connections to the waste stack should be connected at an angle of more than 45 degrees. b) The stack vent prevents sewer gas from being vented through the roof. c) The stack vent and loop vents allow equalization of pressure in the system. d) In multi-story buildings one stack is used for venting and waste disposal. e) Most buildings have several waste and soil stacks with each stack providing drainage for all the sections of the building. |
C
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Corrugations in outside aluminum sheet metal conductors is required a) to increase flow speed of storm water. b) to decrease potential for blockage. c) to eliminate corrosion. d) to allow water flow if there is scale build-up. e) to permit expansion. |
E
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Which of the following statements about footing drains is true? a) Installed to prevent an accumulation of ground water around the building foundations. b) Used to reduce the hydrostatic pressure on the walls below ground level. c) Perforated or porous pipe is used to collect the water near the footings d) The collected water is drained to a remote area or into a sump. e) All of the above |
E
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The blow off valve in a storage heater is used to a) eliminate pressure build-up in the heater. b) monitor unsafe temperatures. c) release steam should the heater malfunction to avoid flashing of steam in the fixtures. d) remove sediment carried to the heater through the water line. e) shut off the flow of gas if the flame and pilot light are extinguished. |
D
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What is the correct sequence, from start to finish, needed to replace a washer in a faucet? i) Unscrew the packing nut and remove the spindle. ii) If the valve seat is smooth and serviceable, replace the spindle and tighten the packing nut. iii) Remove the washer from the end of the spindle. iv) Shut off the water at the nearest isolation valve. v) Place the new washer on the end of the spindle. a) i, ii, iii, iv, v b) iv, i, iii, v, ii c) v, iv, iii, ii, i d) iv, i, v, ii e) v, ii, i, iv, iii |
B
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The pounding or banging of pipes and shuddering of fixtures caused by a shock wave resulting from a sudden stop of water flow in a pipe results in which of the following sounds? a) chattering of faucets b) whistling of faucets c) water hammer d) hissing in the pipes e) creaking of the pipes |
C
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