Internal output coils are used in which of the following situations?
A. to control output field devices
B. to control contacts in other rungs
C. in situations where there are a limited number of output terminals available
D. both b and c
Answer: D
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Fill in the blank(s) with the appropriate word(s).
What are the symptoms when a system is low on refrigerant?
a. low suction and high head pressure b. low suction and low head pressure c. low subcooling and low superheat
Why does a walk-in refrigerator evaporator freeze up from too much load or door open?
a. Not enough off-cycle to defrost the coil. b. The evaporator gets too cold trying to pull down the load. c. The condensing pressure gets too high and floods the evaporator.
Kindling usually occurs at night.
Answer the following statement true (T) or false (F)