ASE A7 Heating Air Conditioning Practice Test

6. Two technicians are discussing a CCOT air conditioning system. Technician A says the system's pressure cycling clutch switch contains a bulb placed on the inlet port of the evaporator core. Technician B says a pressure cycling switch is located on the low side of the system. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

6.

Answer A is wrong. An expansion valve uses a sensing bulb placed at the outlet port of the evaporator.

Answer B is correct. A typical pressure cycling switch is located on the accumulator or the low side of a system.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

7. All these statements are true about a throttle position sensor EXCEPT:

  • A. It indicates throttle position to the engine control module.
  • B. The control module disengages the A/C clutch at wide open throttle.
  • C. The ECM disengages the A/C clutch at idle.
  • D. The throttle position sensor signal is used to indicate throttle angle.

7.

Answer A is wrong. The TP sensor indicates throttle angle to the engine control module.

Answer B is wrong. When the control module receives a WOT or wide open throttle signal from the TP sensor, it disengages the compressor clutch.

Answer C is correct. This is an except question. All the other choices are true except this one. The compressor's clutch is not disengaged at idle, it's disengaged at WOT providing additional power when needed.

Answer D is wrong. The throttle position sensor signal is used to indicate throttle angle.

Diagram of automotive ac control circuit.

8. All of these statements are true about component A in the illustration above EXCEPT.

  • A. It is a two position actuator.
  • B. It contains a potentiometer.
  • C. It provides feedback to the controller.
  • D. It contains a variable resistor.
AC temperature blend door circuit diagram.

8.

Answer A is correct. It's a variable-position actuator.

Answer B is wrong. A potentiometer is a type of variable resistor.

Answer C is wrong. The potentiometer provides door angle feedback to the controller.

Answer D is wrong. It contains a variable resistor.

9. Technician A says refrigerant flows from the top of the condenser to the bottom. Technician B says a restriction in a condenser can cause damage to the compressor. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

9.

Answer A is wrong. The refrigerant enters the condenser as a gas and leaves as a liquid.

Answer B is wrong. The pressure will build, blowing seals and damaging upstream components.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

10. 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?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

10.

Answer A is wrong. Both technician A and B are correct.

Answer B is wrong. Both technician A and B are correct.

Answer C is correct. Electric fans offer more precise control than the conventional belt driven fans do. They're important for engine cooling, air conditioning and heater performance. These fans are controlled by a control module that uses pressure and temperature actuated sensors and switches.

Answer D is wrong. Both technician A and B are correct.