Why must you cover the coils when testing the heat pump in warm weather?
A) To prevent the heat pump from overloading the compressor
B) To increase the amount of heat delivered to the system
C) To reduce the amount of heat lost from the system
D) To trigger the temperature valve to release excess pressure
A
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The valve stem provides a link between the handwheel and the _____.
a. bonnet b. gate c. body d. packing
La distancia máxima a la que se debe sujetar un cable tipo NM de una caja de empalme es de _____.
a. 6 pulgadas (15,24 cm) b. 8 pulgadas (20,32 cm) c. 12 pulgadas (30,48 cm) d. 16 pulgadas (40,64 cm)
How is using propane different from using natural gas?
A) Appliances that use natural gas cannot use propane. B) Propane requires a self-contained tank. C) Natural gas requires a self-contained tank. D) Propane is harder to measure than natural gas.
In a purge level measurement system, the amount of pressure required to force air through the tube is __________ proportional to the amount of liquid in the tank.
A. directly B. inversely