The accompanying figure shows the components needed to construct a(n) ____________________ control circuit.
Fill in the blank(s) with the appropriate word(s).
reversing
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Before it is considered a continuous load, a load must operate for at least how many hours without interruption?
a. 3 b. 10 c. 12 d. 24
What size should the combustion air ducts be for a room with a 60,000 BTU/hr input furnace and a 16,000 BTU/hr water heater if the air is traveling through horizontal ducts?
A) 76,000/1,000 = 76 sq in free area each B) 76,000/2,000 = 38 sq in free area each C) The size is irrelevant so long as there are combustion air vents. D) 76,000/4,000 = 19 sq in free area each
What are the characters that are embedded in most engine blocks and are used for identification?
A) Julian date B) Casting number C) VIN D) Calibration codes
A new steady-state condition occurs ____ time constant(s) after a controlled variable is exposed to an energy change.
A. 1 B. 5 C. 63