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6
CONTROL PRINCIPLES AND HARDWARE
ANSWERS TO TEXTBOOK QUESTIONS AND EXERCISES
1. The control differential is the desired temperature difference between when the controller
2. The controlled variable is usually indoor air temperature, and the manipulated variable is
3. With floating control, the greater the error, the longer the duration of the contact closure
4. 0.73
7. When a valve with an equal percentage characteristic is used to regulate the flow, there is
8. decreases; decreases
11. target; actual
12. The number of poles on a switch refers to the number of independent and simultaneous
13. A triac can vary the output waveform supplied to the circulator based on instructions
15. 0.63 ΔT hr
17. [Please note: In the first printing of the text, Figure 6-57 is incorrectly labeled to be used
18. [Please note: In the first printing of the text, Figure 6-58 is incorrectly labeled to be used
19. The electrical resistance of the wiring will cause an inaccurate temperature reading.
23. Delay-on-make mode prevents the contacts from moving until a user-specified time delay
24.
25. The main switch is incorrectly shown on the neutral side of the ladder diagram. It should
