ASE ASE Heating & Air Conditioning

Question 1

Which refrigerant is currently mandated for use in most new US passenger vehicle air conditioning systems?

Accepted Answer

R-1234yf

Answer

R-12

Answer

R-134a

Answer

R-22

Question 2

What component in an automotive A/C system separates liquid refrigerant from vapor before it enters the compressor?

Accepted Answer

Accumulator

Answer

Condenser

Answer

Evaporator

Answer

Expansion valve

Question 3

A technician finds a vehicle's A/C blows cold air at highway speeds but warm at idle. What is the MOST likely cause?

Accepted Answer

Faulty condenser fan

Answer

Low refrigerant charge

Answer

Clogged expansion valve

Answer

Worn compressor clutch

Question 4

What does superheat measurement indicate during an A/C system diagnosis?

Accepted Answer

Amount of refrigerant vapor above its boiling point at the evaporator outlet

Answer

Compressor efficiency

Answer

Condenser outlet temperature

Answer

Receiver-drier saturation level

Question 5

When recovering refrigerant from an A/C system, a technician must use EPA-certified equipment per which regulation?

Accepted Answer

EPA Section 608

Answer

CAA Title II

Answer

OSHA 29 CFR 1910

Answer

DOT 49 CFR 173

Question 6

Which tool is used to measure the high-side and low-side pressures of an A/C system simultaneously?

Accepted Answer

Manifold gauge set

Answer

Vacuum pump

Answer

Leak detector

Answer

Thermistor probe