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A7 PRACTICE TEST

Total questions: 60

Worksheet time: 2hrs 0mins

Name
Class
Date
1.

The oil required in most R-134a refrigerant systems is:

a)

A polyalkylene glycol (PAG) oil.

b)

A synthetic engine oil.

c)

A synthetic mineral oil.

d)

Petroleum oil.

2.
An air-conditioning clutch does not engage the compressor. A voltage measurement shows there is 12 volts at the clutch coil feed wire. Technician A says that the clutch coil could be bad. Technician B says that the clutch coil ground could be bad. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
3.

A refrigerant storage container is being tested for static pressure with a manifold gauge and it has been in a 70 degrees (f) room for 6 hours. The pressure in the container is 94 psi. Which of these is LEAST LIKELY to cause this result?

a)

The refrigerant has a 5% mixture of air blended with it.

b)

The refrigerant has foreign chemicals blended with it.

c)

The refrigerant has an 8% mixture of air blended with it.

d)

The refrigerant container is overfilled by 1%.

4.

Any of these statements about refrigerant system tools are true EXCEPT:

a)

Separate gauges and other refrigerant handling equipment should be used for different types of refrigerant.

b)

Manifold gauge sets for R-134a can be identified by unique service fitting connections.

c)

R-134a service hoses are much bigger because of the high system pressures.

d)

Proper identification of service equipment and hoses is important to prevent cross contamination of refrigerant.

5.
The compressor clutch diode is being discussed. Technician A says a purpose of the diode is to prevent alternating current from the alternator entering the clutch coil. Technician B says a purpose of the diode is to prevent spikes of high voltage created by the clutch coil operation from damaging delicate electronic components. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
6.

Which of these inputs to the engine PCM would be LEAST LIKELY to cause an interruption to A/C operation during a drive cycle?

a)

Throttle position sensor

b)

Engine coolant temperature sensor

c)

Upstream oxygen sensor

d)

Power steering pressure switch

7.
A refrigerant identifier can tell if there is:
a)
air in the refrigerant system.
b)
an excessive refrigerant charge.
c)
excessive oil in the refrigerant system.
d)
a low refrigerant charge.
8.
Technician A says that A/C cycling pressure switches are used to prevent evaporator icing on fixed orifice systems. Technician B says that thermostatic deicing switches prevent icing on the condensers of systems that use thermostatic expansion valves. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
9.

The filter screen of an orifice tube is covered with aluminum particles. Which of these could be the cause?

a)

A leaking desiccant bag

b)

A plugged condenser

c)

A damaged compressor

d)

A damaged evaporator

10.
Technician A says that an electronic scan tool can be used to retrieve ATC (automatic temperature control) diagnostic trouble codes from a vehicle. Technician B says that the ATC control head can be used to retrieve diagnostic trouble codes from the engine computer. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
11.

Any of these procedures should be followed when replacing an engine drive belt on a late model vehicle EXCEPT:

a)

Inspecting the belt tensioner for excess play and bearing wear.

b)

Cleaning the dirt and paint flakes out of the pulley grooves.

c)

Inspecting all of the driven components for pulley alignment.

d)

Installing belt dressing on the new belt to assure quiet operation.

12.
Technician A says a vacuum pump is used during the recovery process to remove the last trace of refrigerant from the system. Technician B says any air or moisture not evacuated from the A/C system reduces the system’s efficiency. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
13.

Failure to change the cabin air filter according to the maintenance schedule could result in:

a)

Excessive high-side pressure.

b)

Reduced airflow from the outlets.

c)

A frozen evaporator.

d)

A restricted evaporator drain.

14.

The blower motor does not operate on high speed. All other speeds are operational. Technician A says the blower ground wire may be loose or broken. Technician B says the high-speed relay may be defective. Who is correct?

a)

A only

b)

B only

c)

Both A and B

d)

Neither A nor B

15.
Which of these methods would be the best way to verify the oil level on an A/C compressor?
a)
Flush the compressor
b)
Drain the compressor oil into a measuring cup
c)
Use the oil level dipstick
d)
Recover the refrigerant and check the drained oil bottle
16.
Technician A says a loose ground wire may be the cause of no blower operation. Technician B says a no blower operation may be caused by a defective compressor clutch diode. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
17.

The A/C system on an electric vehicle produces warm air with the controls set to maximum cool. Which of these conditions would LEAST LIKELY cause this problem?

a)

Low refrigerant charge level

b)

Condenser with a blocked air flow

c)

Faulty compressor clutch coil

d)

Restricted receiver dryer

18.

Evacuating a refrigerant system removes:

a)

Moisture from the system.

b)

Rust from the system.

c)

Dirt from the system.

d)

Desiccant particles from the system.

19.

Any of these statements about cooling system service are true EXCEPT:

a)

When the cooling system pressure is increased, the boiling point is decreased.

b)

If more antifreeze is added to the coolant, the boiling point is increased.

c)

A good-quality ethylene glycol antifreeze contains antirust and corrosion inhibitors

d)

Coolant solutions must be recovered, recycled, or handled as hazardous waste.

20.

Hybrid vehicles can have any of these HVAC system characteristics EXCEPT:

a)

A vacuum controlled blend air door.

b)

An electric A/C compressor.

c)

A PTC heater core.

d)

Orange high voltage wires under the hood.

21.

Any of these examples are possible methods for a technician to retrieve trouble codes from a vehicle HVAC system EXCEPT?

a)

Connect a scan tool to the vehicle data link connector (DLC) to communicate with the HVAC system.

b)

Connect a scan tool directly to the HVAC control module to communicate with the HVAC system.

c)

Depressing buttons on the HVAC control head and watching a flashing indicator.

d)

Depressing buttons on the HVAC control head and reading the code on the electronic display.

22.

Any of these statements are true about using the tool shown in the figure to remove an orifice tube assembly EXCEPT:

a)

Pour a small amount of refrigerant oil on top of the orifice tube to lubricate the O-rings.

b)

Rotate the T-handle to engage the notch in the tool in the orifice tube tangs.

c)

Rotate the T-handle to remove the orifice tube from the evaporator inlet pipe.

d)

Hold the T-handle and rotate the outer sleeve on the tool to remove the orifice tube.

23.

To charge an A/C system while it is running, the refrigerant should be added to:

a)

The high side.

b)

The low side.

c)

Both the high and low sides.

d)

Either the high or the low side.

24.
A car is equipped with an A/C compressor driven by a serpentine belt. As the compressor cycles, the belt squeals briefly. Technician A says the belt tensioner may be weak. Technician B says that the system may be overcharged with refrigerant. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
25.

Frost is forming on one of the condenser tubes near the bottom of the condenser. This problem could be caused by:

a)

Restricted airflow passages in the condenser.

b)

A refrigerant leak in the condenser.

c)

A restricted refrigerant passage in the condenser.

d)

A restricted fixed orifice tube.

26.

Which of these is LEAST LIKELY to be performed when replacing the HVAC control panel on a manual climate control system of a late model vehicle?

a)

Removal of the trim bezels around the control head

b)

Disconnection of the vacuum hoses from all of the mode actuators

c)

Carefully touching a metallic surface on the vehicle before disconnecting the main harness

d)

Disconnection of the vehicle battery

27.

Any of these statements about refrigerant lines are true EXCEPT:

a)

Suction lines are located between the outlet side of the evaporator and the inlet side or suction side of the compressor.

b)

Suction lines carry the low-pressure, low-temperature refrigerant vapor to the compressor where it again is recycled through the system.

c)

Suction lines can be distinguished from the discharge lines by touch; they are hot to the touch.

d)

The suction line is larger in diameter than the liquid line because refrigerant in a vapor state takes up more room than refrigerant in a liquid state.

28.
The vacuum check valve was lost in a previous repair, but the remaining hoses were still connected. Technician A says that the mode doors would be stuck in the heat mode and would not move in any other positions. Technician B says that the mode actuators would work normally until the vehicle drove up steep hills. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
29.
Technician A says if the suction line to the compressor is covered with thick frost, this might indicate that the expansion valve is flooding the evaporator. Technician B says frost on a line between the condenser outlet and the expansion valve indicates a restriction to the flow of refrigerant. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
30.
A vehicle with an ATC system is being diagnosed. Technician A says that ATC systems use a sun load sensor and can detect if the sun is shining or if it is a cloudy day. Technician B says that ATC systems use a humidity sensor to determine the moisture content in the air. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
31.

A stuck-open engine cooling system thermostat could cause any of these symptoms EXCEPT:

a)

Poor heater operation.

b)

Below-normal engine operating temperature.

c)

Increased fuel consumption.

d)

Engine overheating.

32.

Which of these procedures is LEAST LIKELY to be done during an electric A/C compressor replacement on a hybrid vehicle?

a)

Remove the battery circuit breaker

b)

Replace the compressor belt

c)

Use ester based oil in the A/C system

d)

Use a CAT III meter for voltage measurements

33.
Technician A says some compressor clutch circuits contain a thermal limiter switch that senses compressor surface temperature. Technician B says some A/C compressor clutch circuits have a low-pressure cutoff switch. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
34.
The engine overheats when the vehicle is parked, with the engine running. When the vehicle is driven at highway speeds, the engine operates at the normal temperature. Technician A says a missing or broken radiator fan shroud could be the cause. Technician B says a seized thermostatic fan clutch could be the cause. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
35.
While diagnosing higher-than-normal-system pressures, Technician A checks the condenser for dirt buildup in the condenser’s fins. Technician B tests the engine for indications of an overheating condition. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
36.
Technician A says that the pressure cycling switch should cause the compressor to cycle OFF when the low-side pressure goes below about 25 psi. Technician B says that the pressure cycling switch will cause the compressor to cycle ON when the low-side pressure reaches about 47 psi. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
37.
While conducting a pressure test on an A/C system, the ambient temperature is 80°F (26.6°C), the low-side gauge reads low (8 psi), and the high side also reads low (85 psi). Which of these could cause these readings?
a)
Low refrigerant level
b)
Normal operation
c)
Bad compressor
d)
A high-side restriction
38.

In the figure, the adjustment being performed is to:

a)

The air blend door.

b)

The manual coolant control valve.

c)

The ventilation door control rod.

d)

The defroster door control rod.

39.

Cabin air filters remove dust and pollen from the:

a)

Recirculated air.

b)

Outside air.

c)

All A/C air sources.

d)

Heated air only.

40.
A vehicle with ATC has an inoperative blower motor. The technician used a scan tool to troubleshoot the problem and found that the blower would work at all commanded speeds when using the output test on the scan tool. Which of these faults is the most likely cause for this problem?
a)
Open circuit on the blower motor ground
b)
Cabin temperature sensor shorted out
c)
Faulty ATC control panel assembly
d)
Blown blower motor fuse
41.
Which of these directly supplies voltage to the engine cooling fan motor?
a)
Cooling fan relay
b)
Powertrain control module
c)
Coolant temperature sensor
d)
A/C fuse
42.

A compressor clutch coil can be checked for shorts by measuring:

a)

Current with an ammeter.

b)

Voltage with a voltmeter.

c)

Resistance with an ohmmeter.

d)

Magnetic strength with a magnetometer.

43.
An A/C system of a late model vehicle is being tested and the technician finds that the system works perfectly unless the system is turned to maximum cooling. Technician A says that the system is likely severely overcharged with refrigerant. Technician B says that checking for technical service bulletins would be a wise action to perform. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
44.
When checking a CCOT A/C system, the gauges read normal pressures but the evaporator’s inlet and outlet tubes feel like they are near the same temperature. Measurement confirms that the evaporator outlet pipe is only 10°F colder than the inlet. Which of these conditions could cause this?
a)
A plugged evaporator
b)
A normal system condition
c)
Restricted orifice tube
d)
Leaking condenser
45.

Any of these methods of R-134a A/C system leak detection are acceptable EXCEPT:

a)

Dye and black light.

b)

Electronic leak detector.

c)

Ultrasonic detector.

d)

Propane burner.

46.

In the figure, the blower motor will not run at any speed setting. When the fan speed control on the A/C controls is changed from off to low speed, there is voltage at terminal D2 on the heater/AC programmer. The cause of this problem could be:

a)

A defective blower motor.

b)

A blown 40A fuse, number 4.

c)

A defective HVAC power module.

d)

An open circuit at programmer terminal D2.

47.
A rattling sound is coming from the area of the A/C compressor when in operation. When the compressor is shut off, the noise stops. The A/C system cools well and there are no indications of A/C system problems. Technician A says the noise could be caused by a loose compressor mount. Technician B says the noise could be caused by broken fasteners of the compressor mounting. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
48.
A brushless DC blower motor is being diagnosed for an inoperative condition. Which of these tools would be the most appropriate to identify the pulse width signal to the motor?
a)
Oscilloscope
b)
12-volt test light
c)
A/C volt meter
d)
Analog volt meter
49.

The gauge pressures shown in the figure occur on an R-12, thermal expansion valve (TXV), cycling clutch air-conditioning (A/C) system with an ambient temperature of 80°F (26.7°C). The cause of these readings could be:

a)

Air in the refrigerant system.

b)

A defective A/C compressor.

c)

A low refrigerant charge.

d)

A restricted thermal expansion valve (TXV).

50.

After the recovery process, the low-side pressure increases above zero after 5 minutes. This condition indicates:

a)

There is still some refrigerant in the system.

b)

There is excessive oil in the refrigerant system.

c)

The refrigerant system is leaking.

d)

There is excessive moisture in the refrigerant system.

51.
Which HVAC actuator controls the temperature of the air being distributed from the duct box?
a)
Fresh/recirculated air actuator
b)
Vent mode actuator
c)
Defrost mode actuator
d)
Blend door actuator
52.
Evacuating the A/C system involves which of these?
a)
Removing the oil from the system
b)
Removing the refrigerant and storing in a safe captured system
c)
Pressurizing the system with nitrogen for leak testing purposes
d)
Pulling the system into a negative pressure to remove the air and moisture
53.

In the electric cooling fan circuit shown in the figure, the low-speed and high-speed fans do not operate when the engine is overheated. Both fans will run when the air conditioning is turned on. The cause of this problem could be:

a)

A blown 10A, 5C fuse in the instrument panel fuse block.

b)

A defective engine coolant temperature sensor.

c)

A defective high-speed coolant fan relay.

d)

A defective A/C pressure fan switch.

54.
On a semi-automatic A/C system, the temperature control is set at 70°F (21°C), and the in-car temperature is 80°F (27°C) after driving the car for one hour. The refrigerant system pressures are normal. Technician A says the in-car sensor maybe defective. Technician B says the temperature blend door may be sticking. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
55.
There is a noticeable noise coming from the engine compartment when the A/C is selected. Technician A says this could be caused by a loose compressor mount. Technician B says this could be caused by the system being empty of refrigerant. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
56.
The fins and air passages of an evaporator are heavily clogged. Technician A says the evaporator core must be removed from the case for proper cleaning. Technician B says there would not have been a problem if the evaporator case drain had been cleaned periodically. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
57.
A receiver-drier is located between the condenser and the evaporator. Technician A says the receiver-drier should be changed if the outlet is colder than the inlet. Technician B says the receiver-drier should be changed if the refrigerant in the sight glass appears red. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
58.
After recovery of an A/C system with an A/C machine, which of these statements is true of the system’s condition?
a)
All refrigerant oil has been removed from the system.
b)
The system is ready for normal use.
c)
All refrigerant has been removed from the system.
d)
Humidity has been removed from the refrigerant in the system.
59.
A vehicle is being diagnosed for an inoperative A/C compressor. After verifying that the system contains refrigerant, the technician bypassed the pressure cycling switch to get the compressor to turn on. Technician A says that the pressure cycling switch is faulty and needs to be replaced. Technician B says that the system may have air mixed with the refrigerant. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B
60.
The HVAC fuse blows each time the A/C switch is turned on. Technician A says that an open low-side switch could be the cause. Technician B says that a shorted A/C clutch relay coil could be the cause. Who is correct?
a)
A only
b)
B only
c)
Both A and B
d)
Neither A nor B

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