ASE A7 Heating and AC Practice Exam

Front

A CCOT system has a high high side pressure. Technician A says to suspect the thermostatic expansion valve. Technician B says this system contains an orifice tube. Who is correct?

Back

Technician B only

Front

Corrosion at point A of the electrical diagram above will result in: Excessive resistance in the splice leading to the high pressure sensor., Voltage drop at the connector of the signal circuit for the high pressure sensor., Excessive resistance in the reference circuit of the high pressure sensor., Voltage drop at the connector of the ground circuit for the high pressure sensor.

Back

Voltage drop at the connector of the signal circuit for the high pressure sensor.

Front

A vehicle's air conditioning performance is reduced at low speeds and stop lights, but cools at highway speeds. Which of these is MOST likely the cause of this condition? Options: A low refriderant charge., A missing fan shroud., A normal condition., A faulty compressore clutch relay.

Back

A missing fan shroud.

Front

Two technicians are discussing an inoperative electric blend door in an automatic air conditioning system. Technician A says to inspect the blend door's wiring and connections for an open circuit. Technician B says to troubleshoot this circuit with a test light. Who is correct?

Back

Technician A only

Front

A squeal is heard only when the compressor clutch first engages. Technician A says this is caused by a loose serpentine belt. Technician B says this is caused by a worn clutch pulley bearing. Who is correct?

Back

Technician A only

Front

Component A in the electrical diagram above has all of the following characteristics EXCEPT: It is a negative temperature Coeffiicient sensor., It is a thermistor., It is a variable resistor., It is a switch

Back

It is a switch

Front

A frozen spot is noticed in the center of the condenser. Technician A says a frozen spot on a component or connection indicates a restriction in the system. Technician B says this is caused by a clogged orifice tube. Who is correct?

Back

Technician A only

Front

A technician is diagnosing a vehicle's air conditioning system. The vehicle has good engine performance, but the air conditioner is blowing warm air only. A yellow substance is noticed around the evaporator case drip tube. Technician A says this is coolant leaking from the heater core. Technician B says this is fluorescent dye leaking from the evaporator core. Which technician is MOST likely correct?

Back

Technician B only

Front

R 134a Refrigerant: Containers are sky blue colored.

Back

Containers of R 134a refrigerant are sky blue colored.

Front

Two technicians are discussing electric cooling fans and air conditioning performance. Technician A says electric fans regulate refrigerant temperatures more precisely than belt driven fans do. Technician B says electric cooling fans are controlled by control modules that use temperature and pressure actuated sensors and switches. Who is correct?

Back

Both Technician A and B