1. What causes a trap to "siphon," and in what three ways may it be prevented?

2. What size of soil pipe should be used for an ordinary-sized dwelling, and what pitch should be given to the horizontal portion?

3. What quantity of water per capita should be allowed in designing a sewerage system?

4. What form of cross-section of conduit gives a maximum velocity of flow to small quantities of sewage?

5. Describe the manner of making house connections with the main sewer.

6. Show by sketch the general method of running the waste and vent pipes in a dwelling house, and indicate the proper location of traps.

7. What are the two principal methods of sewage purification?

8. Describe the method of making up the joints in cast iron soil pipe.

9. In what way may the seal of a trap be broken besides siphonage ?

10. What two tests are usually given to a system of plumbing? State the use of each.

11. What grade should be given to main sewers and branches?

12. Give two methods of flushing sewers.

13. Describe briefly some of the usual arrangements in the plumbing of hotels.

14. What is sewage farming ? Describe the process briefly.

15. What is the difference between a "cup joint" and a "wipe joint?" State the conditions under which you would use each.

16. What is the use of a fresh-air inlet in connection with a soil pipe, and how is it connected?

17. Describe the "Smoke Test."

18. Should a trap or fixture be vented into a chimney ? Give the reasons for your answer.

19. What material is commonly used for sewer pipes of different sizes?

20. When are underdrains required and how are they constructed?

21. What precautions should be taken in back venting traps?

22. What chemicals are commonly used in the precipitation of sewage ?

23. How should you connect a lead pipe with a cast or wrought iron pipe?

24. Define the "separate" and "combined" systems of sewerage.

25. What is the principal point to be observed in the disposal of sewage? What precautions should be taken when it is discharged into a stream?

26. What is the sedimentation process ?

27. What precautions should be taken in locating a cesspool? Describe briefly one form of construction.

28. Name some of the most important data to be obtained before laying out a system of sewerage.

29. In designing a system of surface drains what maximum conditions should be provided for?

30. Under what conditions may sub-surface irrigation be used to advantage ?

Review Questions On The Subject Of Plumbing Part II

1. A hotel requires a water supply of 200 gallons of water per minute during a certain part of the day. It receives its supply from a reservoir 1,000 feet distant, and located 116 feet above the house tank, in the attic of the building. What size of wrought-iron pipe will be required to bring the water from the reservoir?

Ans. 3 inch.

2. What is the best kind of pipe for domestic water supply under ordinary conditions? When may it be objectionable?

3. A 1-inch pipe is to discharge 40 gallons of water per minute from a cistern placed directly above it. What must be the elevation if we assume the friction in the pipe and bends to be equivalent to 100 feet?

Ans. 1ll feet.

4. A house tank is situated 15 feet above a faucet upon the fifth floor of the building. If the stories are 8 feet high, what will be the difference in pressure in pounds per square inch between this faucet and one in the basement?

Ans. 17.3 pounds.

5. Describe the action of an hydraulic ram.

6. A pump has a steam cylinder 6 inches in diameter and a water cylinder 5 inches in diameter. What steam pressure will be required to raise water to an elevation of 135 feet, neglecting friction in the pipe?

Ans. 40.3 pounds.

7. Explain the action of the ordinary kitchen boiler, together with the method of making the connections.

8. What pressure per square inch will be required to discharge 200 gallons per minute through a horizontal pipe 2 1/2 inches in diameter and 300 feet long? How many feet head?

{37.4 pounds. Ans. { 87 feet head.

9. What is the difference between a "lift pump" and a "suction pump"? Describe the action of a "deep well" pump.

10. What is the greatest depth at which a suction pump will operate ? Why ?

11. What two systems of water supply are commonly employed ?

12. A storage tank is 10 feet in diameter and 8 feet high. How many gallons will it hold?

Ans. 4700 gallons,,

13. A wooden cistern is 5 feet wide, 6 feet deep and 10 feet long. It is desired to replace it with a tank which shall be 8 feet in diameter. What would be the required height of the tank? What will be the weight of the water contained in the tank?

{ 5.9+feet. Ans. {1,8759 pounds.

14. A 2-inch pipe is used for conducting water to a house from a spring 400 feet away. If the cistern in the house is 50 feet below the level of the spring, how many gallons of water will flow through the pipe per min.?

Ans. 75 gallons.

15. What are the principal causes of accidents in connection with a kitchen boiler, and what precautions should be taken to prevent them?

16. A swimming tank is supplied with hot water through a hot-water heater similar to a house heater. How many square feet of grate surface will be required to raise 1,000 gallons of water per hour from a temperature of 50 to 70 degrees?

Ans. 4.15 square feet.

17. What are circulation pipes when used in connection with a hot-water supply system, and how are they connected?