What is the purpose of the check valves that are installed in parallel with the metering devices on heat pumps?
A) To allow the technician to check the operation of the metering device without recovering refrigerant
B) To prevent excessive pressure difference across the metering device
C) To direct the flow of refrigerant around the metering device that is not being used
D) To provide a pressure testing port on both sides of the metering device
C
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The rectangular coordinate grid of the ____ coordinate system provides the foundation on which drawings produced by CAD are generated.
A. Newtonian B. Galilean C. Cartesian D. standard
Of the silicate clays, smectite has the least tendency to expand upon wetting and shrink upon drying
Indicate whether the statement is true or false
A summing amp has the following values: R1 = R2 = 1.1 k?, R3 = 2.2 k?, Rf = 3.3 k?, V1 = V2 = 2 V, V3 = -4 V. The output of this circuit is
A) 9.33 V B) 12 V C) 21.3 V D) -6 V
What numbering system is used as a "shorthand" way of representing strings of bits?
A) Binary B) Decimal C) BCD D) Hexadecimal