Commercial refrigeration systems normally have:
A) A suction service valve and a discharge service valve.
B) A suction service valve, discharge service valve, and a king valve.
C) A liquid line valve and a suction service valve.
D) Most commercial refrigeration systems do not have refrigeration service valves.
B
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Fill in the blank(s) with the appropriate word(s).
Which of the following is a disadvantage of ejectors?
A. They require a large amount of energy. B. They are hard to install. C. They are expensive. D. They are hard to maintain.
What is the basic difference between an expert system and a conventional computer program?
What will be an ideal response?
A wye-delta transformer has a turns ratio of 2:1. It has a secondary line voltage of 480 V. The secondary is connected to a wye-connected three-phase resistive load of 50 ? in each phase. What is the secondary phase current?
A. 1.6 A B. 2.54 A C. 3.2 A D. 4.8 A