ASE A7 Heating & Air Conditioning – Sample

This question has the word EXCEPT. For this question, look for the choice that could NOT cause the described situation. Read the entire question carefully before choosing your answer. All of the following are true regarding the expansion valve, EXCEPT:

The A/C compressor clutch does not engage. Technician A says that an open high pressure cutout switch could be the problem. Technician B says a blown compressor clutch diode could be the cause. Which technician is correct?

When trying to diagnose a vehicle A/C systems poor performance when the vehicles engine runs perfectly it is observed that a yellow liquid is leaking from the evaporator. What kind of fluid is leaking?

If the air conditioning system has an accumulator, it is a:

An EATC air conditioning system has low fan speed operation during high demand situations, like in direct sunlight. Technician A says this is because something is covering the sun load sensor’s photo diode. Technician B says a sun load sensor is a variable resistor and can be tested with an ohmmeter. Who is correct?

An A/C compressor has a growling noise only with the compressor clutch engaged. The cause of this noise could be:

During normal operation, the receiver-drier on a TXV system should feel:

Technician A says all air conditioning connections use a gasket or O-ring to seal the system. Technician B says when replacing O-rings you lubricate the O-ring with the correct refrigerant oil to prevent nicks and ease installation. Who is right?

Two technicians are discussing the air-conditioning control circuit shown. Technician A says that the computer (ECM) controls the operation of the compressor clutch. Technician B says that the compressor clutch will not engage if the refrigerant pressure is below 8 psi or higher than 430 psi. Which technician is correct

Which of the following is an expansion device?