2. Seassion 23.

Question 0

63. In testing a gas piping system we find a leak, we sometimes use a liquid that turns into a gas (fumes) and we can locate that leak by its odor at or near the leak. Many gas testing pressure gauges are equipped with a cup for this purpose or we can pour this liquid into the piping system hen there is no pressure and then after we can apply pressure in the system by using  an air pump, while the substance vaporizes and is distributed throughout the system. This liquid we use is called:
A. Mercury. 
B. Ether. 
C. Alcohol.
D. Muriatic acid.

Answer 0

B. Ether.

Question 1

46. Scaffold walkways must have no more than a ... inch gap between planks and a guardrail.
A. 1.5".
B. 3.5".
C. 5.5".
D. 9.5".

Answer 1

D. 9.5”.

Question 2

A customer complains of a leak in a combination water closet after the ball cock and flush valve have just bean repaired. The refill tube from the ball cock may be extended in the overflow to be below the level of the water in the tank and cause the tube:
A. To flow water into the bowl.
B. To siphon water from the tank into the overflow tube.
C. To siphon water from the bowl.
D. None of the above.

Answer 2

D. None of the above.

Question 3

173. Siphonage is a detriment to plumbing systems in the siphonage of:
A. Water closets.
B. Domestic boiler.
C. Cellar drainers.
D. Pumps.

Answer 3

B. Domestic boiler.

Question 4

179. A rust joint was permitted under the old code 1938 for acid waste outlet connections made on:
A. "durion" pipe.
B. Corporation pipe. 
C. House drain.
D. House sewers

Answer 4

D. House sewers
Sal ammoniac (acid) and iron filing.

Question 5

185. The one trap not approved in New York City is:
A. "P"trap. 
B. Running "P" trap. 
C."S" trap. 
D. 3/4" "S" trap.

Answer 5

D. 3/4” “S” trap.

Question 6

186. Which of the following statements are true:
     A. Curb boxes may be installed at the option of the owner.
     B. Curb boxes must be installed whenever plumber sees fit.
     C. Curb boxes must be installed on all services.
     D. Curb valves shall be installed on all fire service pipes.

Answer 6

D. Curb valves shall be installed on all fire service pipes.

Question 7

189. Long turn Ty's may be used:
A. At the base of stack.
B. Only on vertical stacks.
C. Only on horizontal drainage lines.
D. On all drainage lines.

Answer 7

A. At the base of stack.

Question 8

190. The proper flux to use on the lead pipe when wiping a lead joint is:
A. Soldering paste.
B. Salammoniac.
C. Rosin.
D. Tallow.

Answer 8

D. Tallow.

Question 9

196.The maximum amount of "D" lead waste pipe allowed for any one fixture is:
A. 2 ft.
B. 3 ft.
C. 4 ft.
D. 5 ft.

Answer 9

D. 5 ft.

Question 10

204. The amount that water expands when frozen is most nearly:
A. 1/3 of its original volume.
B. 1/4 of its original volume.
C. 1/6 of its original volume.
D. 1/12 of its original volume.

Answer 10

D. 1/12 of its original volume.

Question 11

214. A centrifugal pump is to be selected to take suction from an open water tank 8 feet below the centerline of the pump and to deliver this water to a pressure tank 332 feet above the centerline of the pump. If the pressurte tank is to be maintained at a pressure of the pump. If the pressure tank is to be maintained at a pressure of 20 lbs. per sq. in., the pump should have a head in ft. of most nearly (neglecting pipe friction):
A. 82 ft.
B. 86 ft.
C. 80 ft.
D. 88 ft.

Answer 11

B. 86 ft.

(8’+32”)+20”x2.31=86.2’

Question 12

237. When the main cold water supply valve to the house is temporarily closed and a riser is drained at the heel, the most important consideration is to:
     A. Open the topmost faucet.
     B. Avoid water hammer.
     C. avoid air binding.
     D. leave the drain valve open while making the repair.

Answer 12

A. Open the topmost faucet.

Question 13

239. For wiped joints the proper solder mix to use is:
A. One part tin, one part lead.
B. Two part tin, one part lead.
C. One part tin, two parts lead.
D. 60 parts tin, 40 parts lead.

Answer 13

C. One part tin, two parts lead.

Question 14

249. The purpose of commercial standards is to establish for specific commodities, nationally recognized grades or consumer criteria and the benefits therefrom will be measurable in direct proportion to their general recognition and actual use. Instances will occur when it may be necessary to deviate from the standard and the signing of an acceptance does not preclude such departures; however; such signature indicates an intention to follow the commercial standard where practicable, the production, distribution, or consumption of the article in question.
     Nationally respected and adopted commercial standards are:
     A. Undesirable as they are a direct benefit to unscrupulous manufacturers.
     B. Desirable as they serve as a yard stick for consumers.
     C. Undesirable as they tend to lower quality.
     D. Desirable as they tend to reduce manufacturing costs.

Answer 14

B. Desirable as they serve as a yard stick for consumers.

Question 15

250. The purpose of commercial standards is to establish for specific commodities, nationally recognized grades or consumer criteria and the benefits therefrom will be measurable in direct proportion to their general recognition and actual use. Instances will occur when it may be necessary to deviate from the standard and the signing of an acceptance does not preclude such departures; however; such signature indicates an intention to follow the commercial standard where practicable, the production, distribution, or consumption of the article in question.
     The word preclude as used in this paragraph means most likely:
     A. Permit.
     B. Allow.
     C. Include.
     D. Prevent.

Answer 15

D. Prevent.