LESSON 4 SELF TEST EXERCISES
Upon completion of the text assignment, solve the following self test exercises based on lesson objectives.
NOTE: The following exercises are study aids. References to related information in the reading material are
shown in parentheses after each question. Write your answer in the space provided below each question.
When you have finished answering all the questions for this lesson, compare your answers with those
given for this lesson in the back of the booklet. Review the lesson as necessary.
Objective 1. ELEMENTS OF HEATING SYSTEMS. List the basic elements of hot-water and warm-air
heating systems and explain their functions. (Answer questions 1 through 5.)
1. The two classes of hot-water systems are the one-pipe and two-pipe systems, the one-pipe being the simplest
form. Which of the following statements pertains to the one-pipe system? (para 4-2,a)
a. Hot water is piped directly to each radiator.
b. Hot water circulates through at least two mains.
c. The last radiator in circuit will be larger than the first radiator.
d. Water temperature at last radiator in circuit will be the same as at the first radiator.
2. The two-pipe system is used to heat large installations since the one-pipe system is adequate for small
installations only. Which of the flowing statements pertains to the two-pipe system? (para 4-2,b)
a. Hot water circulates through at least two mains.
b. Hot water circulates through each radiator in turn.
c. The last radiator in circuit will be larger than first radiator.
d. Cool water leaving radiators returns to the heater through separate return piping.
3. In a one-pipe system, the pipe returning water to the heating source from the last radiator of a heating circuit,
or loop, is considered a hot-water return line. Note the one-pipe system of figure 4-8. How many hot-water
return lines are required? (para 4-2,c) (fig 4-8)
4. Referring again to figure 4-8, what size pipe, in inches, is used for the heating system? (para 4-2,c) (fig 4-8)
5. In designing a warm-air heating system, it is desirable to have the furnace centrally located. For what reason is
this so? (para 4-3,b)
Objective 2. HEATING ELEMENT SYMBOLS. Identify the graphic symbols used for heating system
elements and interpret the heating elements used on plumbing or heating system plans. (Answer
questions 6 through 8.)
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