NATE Air Conditioning 2

Question 1

What condition is indicated when an air conditioner's evaporator coil is heavily iced over?

Accepted Answer

Low airflow or low refrigerant charge

Answer

Restricted airflow or low refrigerant charge causes the evaporator to drop below freezing, leading to ice formation.

Question 2

What is subcooling in an air conditioning system?

Accepted Answer

Number of degrees liquid refrigerant is cooled below its saturation temperature

Answer

Subcooling measures how many degrees the liquid refrigerant has been cooled below its condensing saturation temperature.

Question 3

Which EPA section requires technicians to be certified before purchasing refrigerants?

Accepted Answer

Section 608

Answer

EPA Section 608 regulations require HVAC technicians to be certified when purchasing and handling refrigerants.

Question 4

What is the purpose of the Schrader valve on a refrigeration system?

Accepted Answer

Provides a service port for pressure measurement and refrigerant access

Answer

Schrader valves are spring-loaded service ports that allow gauges and charging equipment to connect to the system.

Question 5

A high-efficiency split system AC rated at SEER 18 performs better than a unit rated at which of the following?

Accepted Answer

SEER 16

Answer

SEER (Seasonal Energy Efficiency Ratio) measures cooling efficiency; higher numbers indicate better efficiency.

NATE - North American Technician Excellence Practice Test