Control systems that operate on ____ volts are often used in hazardous areas.
a. 24
b. 120
c. 230
d. 240
a. 24
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Does efflorescence in a brick wall reduce the wall's strength?
What will be an ideal response?
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The recovery level for Type II systems containing less than 200 pounds of R-22 refrigerant is:
A) 4" hg vacuum. B) 10" hg vacuum. C) 0 psig. D) 15" hg vacuum.
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What is the SI unit for gravitational potential energy?
a. Newtons b. Watts c. Kelvins d. Joules
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Why would the timer on a time-temperature defrost system reset?
A) The defrost temperature is not cold enough. B) The timing circuit starts a new countdown. C) The system did not trigger the switch on the board. D) The defrost temperature is not warm enough.
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