Duct leakage area calculates: (Multiple Choice)

Duct leakage area calculates:

A) Duct leakage correction factors based on the area of the country.
B) The size of the hole if all the leaks were combined into one.
C) The area where leaks are occurring in the duct systems.
D) Which assigned duct leak category the leak falls into.

[Ques. 2] Before opening the compressor crankcase to take an oil sample, you should:

A) Get the sample tube ready because the oil comes out very quickly under pressure.
B) Increase the crankcase pressure with nitrogen to at least 100 psig.
C) Position yourself directly in front of the drain port.
D) Valve off the compressor and recover the refrigerant down to 12 psig.

[Ques. 3] Pumps for hydronic heating systems are usually:

A) Centrifugal pumps. B) Diaphragm pumps.
C) Piston pumps. D) Gear pumps.

[Ques. 4] What type of heat exchanger coil is best suited for water-source heat pumps using an open-loop well system?

A) Steel B) Cast iron C) Cupronickel D) Copper

[Ques. 5] What is the difference in equivalent length of an 8-in connector between a 45-degree ell and a 90-degree ell?

A) 6 ft B) 9 ft C) 8 ft D) 7 ft

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Duct leakage area calculates: (Multiple Choice)

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