Technician a says that SAE standard J639 spells out details for system design implementation and service. Technician b says that SAE standard J639 specifies refrigerant fitting type and size for each refrigerant. Who is right?
A) A only
B) B only
C) Both A and B
D) Neither A or B
Answer : A) A only
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Night crawlers are considered which of the following?
a. earthworms c. sand crabs b. crawdads d. indigo snakes
When an irregular shape is to be shown in a pictorial drawing, an ______________is the best.
A. isometric drawing B. orthographic drawing C. elevations D. section drawing
Why do closed hydronic systems include pressure-relief valves, expansion tanks, and temperature and pressure-limiting devices?
A) Because building codes require certain controls on every system B) Because the copper piping used in the system requires these measures C) Because freezing must be prevented and antifreeze may not be added D) Because water expands and contracts as its temperature changes