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WorksheetsClimate Control Final Review
Total questions: 60
Worksheet time: 30mins
Name
Class
Date
1.
Technician A says that heat is measured in degrees. Technician B says that temperature is measured in degrees. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
2.
Where in the air conditioning system is the refrigerant a low pressure gas?
a)
Evaporator outlet
b)
Evaporator inlet
c)
Condenser outlet
d)
Condenser inlet
3.
Where in the air conditioning system is the refrigerant a high pressure liquid?
a)
Condenser inlet
b)
Evaporator outlet
c)
Evaporator inlet
d)
Condenser outlet
4.
The compressor operates continuously with which type of system controls?
a)
Orifice tube
b)
POA system
c)
EPR system
d)
Both POA system and EPR system
5.
A thermal expansion valve has a ________ orifice, whereas an orifice tube uses a ________ orifice to control refrigerant flow.
a)
drain; fill
b)
digital; analog
c)
open; closed
d)
variable; fixed
6.
Water is observed dripping out from beneath the evaporator. Technician A says that is normal. Technician B says that the evaporator housing is defective and should be replaced. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
7.
The material used to absorb moisture inside the air-conditioning system is called ________.
a)
ester
b)
desiccant
c)
drier
d)
PAG
8.
What is the function of the desiccant bag inside an accumulator?
a)
It captures excess R 134a.
b)
It captures and stores moisture.
c)
It stores and releases ice.
d)
All of these
9.
Which of the following is NOT a function of the expansion valve?
a)
Prevent the evaporator from freezing
b)
Provide the restriction that separates the low side from the high side
c)
Allow liquid refrigerant to return to the compressor
d)
Meter refrigerant into the evaporator for maximum cooling
10.
Which of the following can result from evaporator freeze-up?
a)
Air is not drawn over the fins
b)
The air-conditioning system produces little or no cooling.
c)
The refrigerant may not properly evaporate.
d)
All of these.
11.
Most rigid refrigerant lines are made of ________.
a)
steel
b)
copper
c)
titanium
d)
aluminum
12.
Which of the following is used in modern automobiles to transfer heat energy?
a)
Engine coolant
b)
Refrigerant
c)
Both Engine coolant and Refrigerant are correct
d)
Neither Engine coolant nor Refrigerant are correct
13.
"Outside air" is also called ________ air.
a)
recirculation
b)
fresh
c)
mode
d)
plenum
14.
What does the snowflake button on the dash do?
a)
Turns on the A/C compressor
b)
Selects defrost
c)
Selects fresh outside air
d)
Selects defog
15.
The ram air that enters the vehicle from the outside enters the HVAC system from ________.
a)
the side vents
b)
behind the headlight
c)
behind the grill
d)
the base of the windshield
16.
The air inlet control door is also called a ________.
a)
recirculation door
b)
fresh air door
c)
outside air door
d)
Any of these
17.
The door used to control interior temperature is called the ________ door.
a)
temperature-blend
b)
outside (fresh) air
c)
recirculation
d)
mode
18.
A five-wire actuator uses two wires to power the motor (power and ground), and three wires for ________.
a)
static electricity protection
b)
a feedback potentiometer
c)
direction control
d)
redundant control
19.
Most recent HVAC actuators are recalibrated after replacement by ________.
a)
turning the ignition switch to the off position
b)
using a battery and jumper wires
c)
using a scan tool or allow it to self-learn after being installed
d)
None of these
20.
Cabin filters remove dust and pollen from the ________ airstream.
a)
recirculated
b)
floor
c)
dash
d)
incoming
21.
The blower motor resistors are mounted in the ________ to help cool the resistors.
a)
duct
b)
heater core
c)
motor brushes
d)
squirrel cage
22.
Setting the A/C controls to "MAX A/C" causes the system to ________.
a)
heat and then cool in-vehicle air
b)
Any of these, depending on the vehicle
c)
alternate between inside and outside air intake
d)
recirculate in-vehicle air
23.
When the blower control is set on "HIGH" the blower motor receives full battery voltage through a ________.
a)
high speed resistor
b)
clamp connector
c)
relay
d)
solenoid
24.
A blower motor works on all speeds except high. Technician A says that the high speed relay may be faulty. Technician B says that the blower motor should be replaced. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
25.
A dual-zone climate control system allows the driver and passenger to set individual temperatures. What design feature of the system allows this to happen?
a)
Use of an upper and lower evaporator
b)
Temperature balance cables and doors
c)
There are two heater cores
d)
Split ducts and two air mix doors
26.
What is the most common type of sunload sensor?
a)
PTC thermistor
b)
Photo diode
c)
Potentiometer
d)
NTC thermistor
27.
An actuator can be capable of how many positions?
a)
Three
b)
Two
c)
Variable
d)
All of these
28.
Technician A says that some cabin filters are accessible behind the glove compartment. Technician B says that some cabin filters are accessible from under the hood. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
29.
The blower motor resistors are used to limit ________ to the motor
a)
current
b)
airflow
c)
voltage
d)
Both current and voltage
30.
Where is the ambient temperature sensor usually mounted?
a)
In the climate control plenum
b)
In front of the radiator
c)
At the intake cowl
d)
None of these is correct
31.
Which of the following is NOT a component of an automatic temperature control system?
a)
Temperature sensors
b)
Control head
c)
Electrically or vacuum operated actuators
d)
All of these are components of a semi-automatic temperature control system
32.
Technician A says that the HVAC doors in an automatic system may be vacuum operated. Technician B says that the HVAC doors in an automatic system may be operated by electric servos. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
33.
Which of the following is NOT a sensor in an ATC system?
a)
Ambient air temperature sensor
b)
In-car temperature sensor
c)
Sun load sensor
d)
Humidity sensor
34.
Which component is used as a feedback circuit?
a)
Potentiometer
b)
In-car temperature sensor
c)
Sun load sensor
d)
Ambient air temperature sensor
35.
The purpose of the afterblow system is to dry the evaporator to help prevent the formation of ________ in the evaporator case.
a)
insect nests
b)
rust
c)
mold and mildew
d)
rotted leaves
36.
in a dual-zone climate control system, the ducts and airflow are split, and two ________ are used to control the temperature
a)
compressors
b)
air mix doors
c)
heater cores
d)
evaporators
37.
A customer complains that the heater works sometimes, but sometimes only cold air comes out while driving. Technician A says that the water pump is defective. Technician B says that the cooling system could be low on coolant. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
38.
What should the pressures of the low-side and high-side A/C system read on a gauge set with the engine off?
a)
The high side should be about 200 PSI with the engine off
b)
The low side should be at or near 0 PSI with the engine off
c)
The high side should be about 20% lower than the high-side pressure
d)
The same
39.
The first step in the diagnostic procedure when attempting to solve an HVAC customer problem is ________.
a)
check for technical service bulletins
b)
visual inspection
c)
check for diagnostic trouble codes
d)
verify customer concern
40.
The last step in the diagnostic procedure is ________.
a)
recharge the system
b)
perform a visual inspection
c)
verify the repair
d)
determine the root cause
41.
Technician A says that with a properly operating air-conditioning system, the inlet to the compressor should be cold and the outlet from the compressor hot. Technician B says that the condenser should be hot and the evaporator cold. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
42.
A clogged ________ tube can cause a lack of cooling.
a)
condensate drain
b)
upper radiator hose
c)
heater hose
d)
orifice tube
43.
What must the technician do before checking an air conditioning system for refrigerant leaks using a black light?
a)
Turn the system off and allow the pressure to equalize
b)
Evacuate the system
c)
Install dye in the system
d)
Overcharge the system by 10 oz.
44.
Technician A says a thermostat which opens too soon can cause poor heater operation. Technician B says low coolant level can cause poor heater operation. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
45.
Technician A says AC system lines and hoses that are cold have lower refrigerant pressure than warmer lines and hoses. Technician B says frost on a system component usually indicates a refrigerant leak in that area. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
46.
Technician A says that oily residue on hoses, components, or fittings indicates an area where refrigerant may be leaking. Technician B says that clogged evaporator fins may cause inefficient air conditioning operation at all blower speeds. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
47.
Technician A says electronic leak detectors make a noise when a leak is detected. Technician B says that often the same leak detector can be used for R-12 and R 134a. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
48.
An air conditioning performance check requires a ________.
a)
thermometer and a vacuum pump
b)
thermometer and a manifold gauge set
c)
manifold gauge set and a volt-ohmmeter
d)
thermometer and a hydrometer
49.
An evaporator is being replaced on a vehicle. It is recommended that the ________ also be replaced at the same time.
a)
blower motor
b)
radiator
c)
blower resistor
d)
heater core
50.
Two technicians are discussing replacing heater hoses. Technician A says that the replacement hoses should be the same length as the original hoses. Technician B says that the replacement hoses should be cut as short as possible to allow more coolant to flow through the heater core faster. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
51.
What service procedure should be performed before recovering refrigerant from an A/C system?
a)
Recover all the refrigerant oil
b)
Flush the radiator
c)
The refrigerant should be identified
d)
Replace the drier
52.
O-rings are usually made from ________.
a)
HSN
b)
natural rubber
c)
neoprene
d)
Either HSN or neoprene
53.
Which reading represents the lowest vacuum reading?
a)
27 in. Hg
b)
29 in. Hg
c)
28 in. Hg
d)
500 microns
54.
Technician A says that all orifice tubes on all vehicles use the same size orifice size. Technician B says that orifice tubes vary the orifice size by application. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
55.
When should the accumulator be replaced with a new one?
a)
Whenever the system is opened for service
b)
Whenever the engine cooling system is flushed
c)
It never needs changing
d)
Every 5 years
56.
A defective thermostat can cause the engine to operate ________.
a)
too cold
b)
too hot
c)
Either too cold or too hot
d)
Neither too cold nor too hot
57.
Technician A says that the system should be vacuumed out so that all the old oil is removed. Technician B says that system evacuation (vacuuming) is done to remove moisture from the system. Which technician is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
58.
What is the purpose of evacuating the AC system?
a)
To eliminate any moisture inside the system
b)
To remove any foreign substances inside the system
c)
Both To eliminate any moisture inside the system and To remove any foreign substances inside the system are correct
d)
Neither To eliminate any moisture inside the system nor To remove any foreign substances inside the system is correct
59.
Two technicians are discussing how to remove refrigerant from a system. Technician A says that you can vent it into the atmosphere as long as it has moisture in it. Technician B says that all refrigerant must be captured. Who is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
60.
Technician A says that vacuum is usually measured in psi. Technician B says vacuum is usually measured in inches of mercury (Hg). Who is correct?
a)
Technician A only
b)
Technician B only
c)
Both Technician A and Technician B
d)
Neither Technician A nor Technician B
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