NATE Air Conditioning 3

Question 1

Which type of compressor uses scroll technology and is common in modern residential AC units?

Accepted Answer

Scroll

Answer

Reciprocating

Answer

Centrifugal

Answer

Screw

Question 2

What is the minimum SEER2 requirement for a new split-system AC unit installed in the US Southeast after January 1, 2023?

Accepted Answer

14 SEER2

Answer

13 SEER2

Answer

15 SEER2

Answer

16 SEER2

Question 3

What is the function of a crankcase heater on a compressor?

Accepted Answer

Prevent refrigerant from migrating into the compressor oil during off cycles

Answer

Warm the discharge line in winter

Answer

Heat the outdoor coil to prevent frost

Answer

Increase compressor speed at startup

Question 4

When charging a system with R-410A, the refrigerant cylinder should be held in which orientation?

Accepted Answer

Upright for vapor, inverted for liquid

Answer

Upside down

Answer

Any position works

Answer

Upright only

Question 5

What does a TXV (thermostatic expansion valve) use to control refrigerant flow?

Accepted Answer

Suction line superheat sensed by a bulb

Answer

Condenser outlet temperature

Answer

Discharge pressure

Answer

Liquid line subcooling

Question 6

What is the primary reason refrigerant recovery is required before opening a sealed refrigeration system?

Accepted Answer

To comply with EPA Section 608 and prevent refrigerant release into the atmosphere

Answer

To reduce system pressure for safe service

Answer

To check refrigerant purity

Answer

To remove moisture from the circuit