The earliest thermometers were based on:
A) The expansion and contraction of a spiral piece of metal.
B) The position of the sun casting shadows.
C) The expansion of a fluid trapped inside a glass tube.
D) The expansion and contraction of air trapped in a tube above a column of liquid.
D
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Which of the following is a poisonous product still used in developing countries?
a. carbon monoxide c. tetraethyl lead b. radon d. sulfur
Which of the following statements is LEAST-Likely true?
A. Hypalon has better high-temperature resistance than Silicone. B. EI systems are similar to the electromechanical contact point systems they replaced. However, electronic systems are far superior and require very little maintenance. C. Nonelectronic ignition systems used mechanical contact points to alternatively energize and then open the primary ignition circuit. D. Most ignition systems control primary current flow on the ground side of the coil.
What are the broad areas that commercial refrigeration equipment is grouped in based on the evaporator coil temperature?
A) Perishable frozen and perishable non-frozen B) Frosting, non-frosting, and defrosting C) Refrigerator and freezers D) High, medium, low, and cryogenic temperatures
Which of the following is the most likely outcome if the condensing unit is not properly leveled?
A. The condenser fan motor will fail prematurely. B. The compressor may fail prematurely. C. The condenser coil will become blocked or clogged more quickly. D. The suction pressure will drop.