How do you calibrate a mercury thermometer when the numbers are etched on the stem?
What will be an ideal response?
Record the amount of + or - error on the thermometer body or attached tag.
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Within an air distribution system, the lowest pressure level is found at the _____.
a. conditioned space b. input to the return duct c. input to the blower d. output of the blower
A "material removal prohibited" symbol has
A. A small circle, in place of the horizontal line in the "V". B. A number to the left of the machining symbol. C. A "G" above the horizontal line of the "V".
At about what temperature does oxygen combine with the nitrogen in the air to form NOx?
A) 500 degrees F B) 1500 degrees F C) 750 degrees F D) 2500 degrees F
A protective casing that requires no finishing is known as a(n) _____
a. control joint b. L-bead c. J-bead d. expansion joint