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

System is overcharged with refrigerant

Answer

Excessive outdoor ambient temperature

Answer

High indoor humidity

Question 2

What is subcooling in an air conditioning system?

Accepted Answer

Number of degrees liquid refrigerant is cooled below its saturation temperature

Answer

Cooling the suction line below ambient

Answer

Reducing condenser fan speed

Answer

Lowering the thermostat setpoint

Question 3

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

Accepted Answer

Section 608

Answer

Section 406

Answer

Section 410

Answer

Section 302

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

Controls refrigerant flow rate

Answer

Prevents refrigerant from reversing direction

Answer

Regulates compressor speed

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 20

Answer

SEER 21

Answer

SEER 19

Question 6

What does a low suction pressure reading typically indicate in a residential AC system?

Accepted Answer

Low refrigerant charge or restricted airflow

Answer

Overcharge of refrigerant

Answer

Condenser fan failure

Answer

Faulty discharge valve