Why is a check valve installed in the suction line of the lowest-temperature coil in a multiple-evaporator system?
A) To allow the service technician to check the operation of the system
B) To ensure that the refrigerant is completely vaporized before leaving the evaporator
C) To prevent refrigerant migration from the higher-temperature-and-pressure coil to the lower-temperature and-pressure coil
D) To allow the coil to be isolated from other evaporator coils when checking the operating of the evaporator pressure regulator
C
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Refer to Exercise 3. Resistors are randomly selected from the box, one by one, until a 100? resistor is selected.
a. What is the probability that the first two resistors are both 50?? b. What is the probability that a total of two resistors are selected from the box? c. What is the probability that more than three resistors are selected from the box?
The solder most commonly used on low-pressure copper fittings is made from _____.
a. 100% lead b. 50% tin/50% silver c. 95% tin/5% antimony d. 45% silver/25% zinc/30% copper
An animal uses nutrients for growth only after _____ requirements are met
a. growth c. maintenance b. reproduction d. energy
Compute the measure of ?F rounded to the nearest minute.
Fill in the blank(s) with the appropriate word(s).