____________________ instruments measure the temperature of vapors, liquids, and solids.
Fill in the blank(s) with the appropriate word(s).
Temperature measuring
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Furnace gas manifold pressure is measured in:
A) Inches mercury column. B) Psia. C) Inches water column. D) Psig.
How does soot accumulation on the inside of the heat exchanger affect system efficiency?
A) The soot increases the heat exchanger internal resistance, thereby increasing efficiency. B) The soot provides extra fuel during the high-fire stage, thereby increasing efficiency. C) The soot acts like an insulator on the inside of the heat exchanger, thereby increasing efficiency. D) The soot acts like an insulator on the inside of the heat exchanger, thereby reducing efficiency.
Three stages of human reaction to stress are: 1) alarm, 2) resistance, and 3) exhaustion.
Indicate whether the statement is true or false.
The output of an OR gate is HIGH ________
A) only when all inputs are LOW B) only when all inputs are HIGH C) when at least one input is HIGH D) None of the above