What efficiency advantage do water-source heat pump systems have over air-source heat pump systems?
A) Water is a more efficient refrigerant than either R-22 or R-410A.
B) Heat has more affinity for water than air.
C) Water is a more efficient heat-transfer medium, and water temperatures are moderated by the earth.
D) It takes less horsepower to pump water than air.
C
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What type of pliers are snub-nosed pliers with two flat gripping surfaces, two opposing cutting edges, and insulated handles that help reduce the risk of electrical shock?
A. Locking pliers B. Adjustable pliers C. Needle nose pliers D. Lineman’s pliers
When measuring resistance, a reading of OL on the DMM indicates ________
A) A defective meter probe B) An open circuit C) Continuity of the circuit D) None of these
Which of the following is an incorrect statement regarding air system fittings and transitions?
A) Their pressure loss is greater than that of a given length of the same size straight duct. B) They can be used to change the direction of airflow in a duct system. C) They have the same pressure loss per foot as the same size of straight duct. D) They can be used to change the velocity of airflow in an air duct system.
What is the purpose and function of a transmission?
a. Allows the vehicle to accelerate up a hill b. Allows the engine to accelerate the vehicle c. Allows engine speed to be reduced at higher speeds to save fuel d. All of the above