In refrigeration and air conditioning, safety controls are wired:
A) In parallel with the power supply.
B) In series with the load they protect.
C) In either series or parallel with the load they protect.
D) In parallel with the load they protect.
B
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?Technician A says when employees terminate their employment, they must be informed by their employer about the hazardous materials they have been working with. Technician B says employers must inform employees of any hazardous materials they may come in contact with during new employees orientation. Who is correct?
A. ?A only B. ?B only C. ?Both A and B D. ?Neither A nor B
Interior overhead lights (dome lights) are operated by door jamb switches that ________
A) Complete the power side of the circuit B) Complete the ground side of the circuit C) Move the bulb(s) into contact with the power and ground D) Either A or B depending on application
Why are biocides added to cooling-tower water?
A) To increase biofilm B) To decrease the pH C) To increase the pH D) To reduce biofilm
A room is 10X10X8. There are two outside walls, each 10X8, and one window, 24" X 36". The window is double glass, with sealed space between. The walls are framed with wood and 3-5/8" batts. The ceiling has 6" batt insulation. The temperature difference is 30 degrees F. What is the ceiling BTU loss?
Fill in the blank(s) with the appropriate word(s).