PTAC unit performance is certified by
A) Air-Conditioning, Heating and Refrigeration Institute, AHRI
B) American Society of Testing and Materials Engineers, ASTME
C) Environmental Protection Agency, EPA
D) Underwriters Laboratory, UL
A
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Which of the following is NOT a type of frame construction?
a. balloon b. prestressed c. platform d. braced
How long can power be retained in the high voltage system once it has been disabled?
A) 4 hours B) 10 minutes C) 90 seconds D) None of these
What is a general characteristic of all Light Emitting Diodes?
A) All LED's have the same voltage drop B) LED's can emit any color in the spectrum C) All LED's emit infrared radiation D) The amount of light output is proportional to forward current
The first step to solving a problem is to _____
A) find a solution B) define it C) ask for help D) have a plan