Question 1

What causes a thermistor to change resistance value?

Accepted Answer

A change i

Question 2

Technician A says to measure current on the blower motor circuit by connecting the DVOM in series at any point between the switch and the motor ground.Technician B says the motor should not be powered while measuring current.Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 3

An air conditioning system has no blower speeds.When the blower motor lead is connected to a 12-volt power source,it begins to operate.Technician A says this means the blower is defective.Technician B says this means the problem is in the control system.Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 4

When will a compressor discharge pressure switch disengage the compressor clutch?

Accepted Answer

If the hig

Question 5

Explain what is meant by this sentence: "The change in resistance value of each sensor is inversely proportional to a temperature change."

Accepted Answer

The change in temperature has

Question 6

Technician A says to always recover the refrigerant before removing a pressure switch.Technician B says a different pressure range switch may be installed to compensate for a worn but serviceable compressor.Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 7

On an automatic temperature control system that will not hold the temperature set at the control panel,what should the technician do first?

Accepted Answer

A)  Replace the incar temperature sensor. 
B)  Replace the the temperature mode door actuator. 
C)  Refer to the appropriate manufacuterer service information. 
D)  Recover and recharge the A/C system. 
A)  Replace the incar temperature sensor. 
B)  Replace the the temperature mode door actuator. 
C)  Refer to the appropriate manufacuterer service information. 
D)  Recover and recharge the A/C system.

Question 8

During heavy acceleration a vihicle has sluggish performance when the air conditioning is on.Which of the following is the most likely cause?

Accepted Answer

A)  A restricted cabin air filter. 
B)  A faulty engine load sensor cut-off system. 
C)  A faulty condenser cooling fan. 
D)  A slipping A/C compressor clutch. 
A)  A restricted cabin air filter. 
B)  A faulty engine load sensor cut-off system. 
C)  A faulty condenser cooling fan. 
D)  A slipping A/C compressor clutch.

Question 9

Infrared temperature sensors measure surface temperatures rather than air temperature.

Accepted Answer

A) True 
 B)False

What causes a thermistor to change resistance value?

Technician A says to measure current on the blower motor circuit by connecting the DVOM in series at any point between the switch and the motor ground.Technician B says the motor should not be powered while measuring current.Who is correct?

An air conditioning system has no blower speeds.When the blower motor lead is connected to a 12-volt power source,it begins to operate.Technician A says this means the blower is defective.Technician B says this means the problem is in the control system.Who is correct?

When will a compressor discharge pressure switch disengage the compressor clutch?

Explain what is meant by this sentence: "The change in resistance value of each sensor is inversely proportional to a temperature change."

Technician A says to always recover the refrigerant before removing a pressure switch.Technician B says a different pressure range switch may be installed to compensate for a worn but serviceable compressor.Who is correct?

On an automatic temperature control system that will not hold the temperature set at the control panel,what should the technician do first?

During heavy acceleration a vihicle has sluggish performance when the air conditioning is on.Which of the following is the most likely cause?

Infrared temperature sensors measure surface temperatures rather than air temperature.

Heating and Air Conditioning - History and the Environment

Temperature and Pressure Fundamentals

Engine Cooling and Comfort Heating Systemsdiagnosis and Service of Engine Cooling and Comfort Heating Systems

Air-Conditioning System Operating Principlesthe Manifold and Gauge Set

Refrigerant System Componentsservicing System Components

Refrigerant System Servicing and Testingair-Conditioning System Servicing and Testing

Diagnosis of the Refrigeration System

Compressors and Clutches

Case and Duct Systems

Retrofit and Future Trends

Extenssion 1: Shop Safety

Extenssion 2: Typical Shop Procedures and Tools

Filters

Exam 10: System Controlsdiagnosis and Service of System Controls

What causes a thermistor to change resistance value?

Technician A says to measure current on the blower motor circuit by connecting the DVOM in series at any point between the switch and the motor ground.Technician B says the motor should not be powered while measuring current.Who is correct?

An air conditioning system has no blower speeds.When the blower motor lead is connected to a 12-volt power source,it begins to operate.Technician A says this means the blower is defective.Technician B says this means the problem is in the control system.Who is correct?

When will a compressor discharge pressure switch disengage the compressor clutch?

Explain what is meant by this sentence: "The change in resistance value of each sensor is inversely proportional to a temperature change."

Technician A says to always recover the refrigerant before removing a pressure switch.Technician B says a different pressure range switch may be installed to compensate for a worn but serviceable compressor.Who is correct?

On an automatic temperature control system that will not hold the temperature set at the control panel,what should the technician do first?

During heavy acceleration a vihicle has sluggish performance when the air conditioning is on.Which of the following is the most likely cause?

Infrared temperature sensors measure surface temperatures rather than air temperature.

Heating and Air Conditioning - History and the Environment

Temperature and Pressure Fundamentals

Engine Cooling and Comfort Heating Systemsdiagnosis and Service of Engine Cooling and Comfort Heating Systems

Air-Conditioning System Operating Principlesthe Manifold and Gauge Set

Refrigerant System Componentsservicing System Components

Refrigerant System Servicing and Testingair-Conditioning System Servicing and Testing

Diagnosis of the Refrigeration System

Compressors and Clutches

Case and Duct Systems

Retrofit and Future Trends

Extenssion 1: Shop Safety

Extenssion 2: Typical Shop Procedures and Tools

Filters