WorksheetsHAC 101 Week 4
Total questions: 27
Worksheet time: 15mins
The Clean Air Act (CAA) _______.
Mandates that each shop maintain a current government-issued license
Outlines the specific refrigerants that can be safely used for each application
Sets the standards for shops that do air-conditioning work
All of the above
The 609 license never expires.
True
False
The 609 license ensures that the technician knows how to repair the automotive air-conditioning systems.
True
False
Section 609 of ______ the federal law that regulates air emissions from stationary and mobile sources contains all of the motor vehicle air-conditioning (MVAC) requirements and laws.
The OSHA code and compliance guidelines
The Clean Air Act (CAA)
The Department of Transportation (DOT)
None of the above
The ______ of the refrigerant system is designed to allow easy transformation of the refrigerant from a liquid to a gas.
High side
Low side
Medium side
None of the above
The amount of heat required to raise the temperature of 1 pound of water at 32°F (0°C) and at atmospheric pressure by 1°F would be:
1 kelvin.
1 Btu.
1 joule.
1 rankine.
When the pressure of a gas is raised, its temperature:
goes down.
remains unchanged.
goes up.
becomes unstable.
Radiation describes the amount of heat it takes to move temperature up or down in degrees.
True
False
The A/C compressor clutch is engaged and disengaged by using:
hydraulic pressure.
vacuum.
compressed air.
electromagnetism.
The air-conditioning hose connections are secured to the hose using special unions known as (a) that must be carefully assembled to avoid leaks.
The A/C condenser is normally positioned:
in front of the radiator.
behind the radiator.
in the cabin air box.
on the firewall.
_____, a member of the CFC family of gases, was the first common refrigerant to be used in an automotive air-conditioner.
HFO-1234yf
Tetrafluoroethan (R-134a)
Dichlorodifluoromethane (R-12)
Pentafluoroethane (R-410a)
Fixed orifice tube automotive air-conditioning systems use a(n) _____ to ensure that a pure gas is delivered to the compressor.
Thermal expansion valve
Evaporator
Condenser
Accumulator
The _____ is installed on the low-pressure refrigerant line or the accumulator to turn the air-conditioning clutch on and off at certain pressures.
Pressure cycling switch
Fixed orifice tube
Accumulator
Variable-pressure cycling switch
When the compressor switches on, the suction from the compressor removes refrigerant vapor from the evaporator and ______ its pressure.
Lowers
Raises
Varies
None of the answers listed
The fixed orifice tube in an A/C system is a metering device that forces a high-pressure:
gas into a low-pressure gas.
gas into a low-pressure liquid.
liquid into a low-pressure liquid.
liquid into a low-pressure gas.
The resistor pack or resistor block uses resistors in ______ to regulate the speed of the blower motor fan.
Parallel
Series
Modified parallel
All of the answers listed
When the pressure on hot coolant (above 212°F) is lowered, it:
leaks out.
boils instantly.
forms a gel-like substance.
None of the answers listed.
A vehicle's heating and ventilation blend doors can be operated ________.
Mechanically
By vacuum
By Electric motors
All of the above
What is the chemical name for R12?:
(a)
Why is it important for a tech to properly label refrigerant?
It increases shelf life.
Makes the tank look more professional
Its only necessary for new refrigerant not recycled refrigerant
It helps prevent mixing incompatible refrigerants which could damage equipment
Quarter Turn shut off valve do?
Manage the flow of coolant
For florescent dye and UV lamp
Electronic Leak Detector
For the electrical system
Regulate the flow of refrigerant
What is one of the pins for an automotive relay?
30
45
23
21
70
True or false: Does BTU stand for British Temperature Unit??
True
False
Whats the best way to find a leak in the AC system?
Use a sniffer
Use soapy water
Dye
All the above
What is the Low side pressure range with an ambient temp 57 degrees F?
49-123 psi
120-171 psi
25-30 psi
28-43 psi
HFC:
(a)
