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Hot Water Suply

Examination Questions

Notice to Students.—Study the Instruction Paper thoroughly before you attempt to answer these questions. Read each question carefully and be sure you understand it; then write the best answer you can. When your answers are completed, examine them closely, correct all the errors you can find, and see that every question is answered; then mail your work to us.

(1) How may the water temperature in a storage tank be controlled when the water is heated by a hand-fired coal- burning boiler devoted to this use alone?

(2) What volume, in gallons, will be occupied by 57 gallons of water heated from 40° to 212° F.? Ans. 59.537 gal.

(3) Explain why the hot-water heater shown in Fig. 16 is economical in operation.

(4) What is the object of a relief, or expansion, pipe applied to a hot-water supply system?

(5) A residence requires 100 gallons of hot water per day heated from 50° to 140° F. How many tons of coal per year will be required to heat this water? Ans. 1.95 tons.

(6) What is the difference between a natural and a forced circulation ?

(8) In a system used for cooling water that circulates in the pipes, by what means is a natural circulation established and maintained?

(9) What are the advantages of supplying stop-and-waste cocks for the various lines of a hot-water supply system ?