Exam 4 Flashcards
1
Q
When refrigerant passes through the condenser, the refrigerant liquid will still be warm or hot to the touch and will still be under a high pressure of ___ to ___ psi.
A
100 to 250 psi
2
Q
Even when the thermostat is ____ open, it ____ down the flow of coolant.
A
Wide
Slows
3
Q
Manufacturers recommend draining, flushing and replacing the coolant every __ months or __ 000 km.
A
12 months
48 000 km
4
Q
During charge, another chemical reaction is taking place. _______ on the positive and negative plates is forced back into the electrolyte where it is able to combine with hydrogen and reform acid.
A
Sulphate
5
Q
________ refers to a liquid changing into a vapour state. Heat is absorbed when a liquid changes into a _____.
A
Vaporization
Vapour
6
Q
Fan blades with flexible trailing edges are also called a ______ pitch fan, flexible or ___ fan.
A
Variable
Flex
7
Q
When a diode is incorporated into a circuit, it allows current to flow in one _______, but blocks current flow in the _______ direction.
A
Direction
Opposite
8
Q
_________ refers to a vapour changing into a liquid state. Heat is _____ off when a vapour changes into a liquid.
A
Condensation
given
9
Q
The battery case is made of impact-resistant ______ to withstand acid and thermal shock.
A
Plastic
10
Q
Hoses are typically made from _____ or ______ rubber and must be able to withstand extreme heat as well as extreme cold.
A
Butyl
Neoprene
11
Q
______ wiring is the low-voltage wiring in the automobile wiring system. This includes all lighting, accessories and power distribution circuits.
A
Primary
12
Q
Antifreeze products are typically manufactured from ________ products and are considered toxic.
A
Petroleum
13
Q
Protection is arranged in several levels. The first protection is as close to the _____ as possible and has a fairly high current rating.
A
Battery
14
Q
The pressure relief _____ controls the maximum pressure in the system.
A
Spring
15
Q
After installation of any radiator, always make sure the ______ or _____ valve is closed to prevent accidental spills when filling.
A
Petcock
Drain Valve
16
Q
Most radiators in today’s vehicles are of the _____-____ design.
A
Cross-Flow
17
Q
A
18
Q
The thermostat should open within _°C to _°C of the rating stamped on it.
A
3 to 6
19
Q
When the engine is ____, the thermostat is _____ and forces the coolant to bypass the radiator and only circulate through the engine.
A
Cold
Closed
20
Q
When recharging adjust the gauge suction valve so that the gauge pressure does not exceed __ psi.
A
50 psi
21
Q
If the system is low on refrigerant, ______ will show up in the sight glass.
A
Bubbles
22
Q
The discharge of static electricity is called _________ discharge (ESD)
A
Electrostatic
23
Q
Too little AC oil can result in compressor _____, and too much can result in insufficient _____.
A
Seizure
Cooling
24
Q
The _______ battery cable must always be disconnected first and should reconnected last.
A
Negative
25
A ________ short may occur when two power wires lose their insulation. If the live bare wires come in contact with each other, more than one component may operate when the switch is turned on.
Crossover
26
All AC system components are connected with \_\_\_\_.
Lines
27
R-12 has a boiling point of \_\_ºF (-6°C)
22 F
28
\_\_\_\_\_\_\_\_ belts are very common on today's models and usually only one is used to drive all the belt-driven accessories.
Serpentine
29
A _________ is a substance with a low boiling point.
Refrigerant
30
\_\_\_\_\_ belts have been common on automobiles for more than 60 years.
Drive belts
31
\_\_\_\_ fans are used to improve fuel economy.
Flex
32
Strip the insulation from the wire, leaving ____ an inch of copper showing.
Half and inch
33
Water by itself causes _____ and ____ to build up in the cooling passages, which can hinder cooling and create hot spots and restrictions.
Scale and rust
34
\_\_\_\_-blade fans were at one time considered the standard for non-air-conditioned rear-wheel drive vehicles.
Four-blade
35
The Canadian Enviromental Protection Act prohibited the production or importation of CFCs on January 1, 19\_\_.
Most hydrochlorofluorocarbons (HFCs) such as R-22 will also be phased out in Canada by the year 20\_\_
1996
2020
36
The rate of self-discharge of a battery increases as the temperature of the battery \_\_\_\_\_\_\_\_. Therefore, batteries are best stored in a ____ and dry location.
Increases
Cool
37
A positive plate is created by coating a lead-calcium plate grid with a very porous, brwon crystalline meterial called ____ peroxide (PbO2)
Lead
38
The water pump can circulate coolant at a rate as high as ____ gallons per hour.
7500
39
Expansion valves may be _______ or _______ equalized.
Internally or Externally
40
\_\_\_\_\_\_\_ is the force that causes electrons to flow.
Voltage
41
As refrigerant temperature increases, so does the pressure within the container. The _____ the temperature, the higher the pressure.
Higher
42
The temperature-sensing mechanism on a thermostatic fan clutch is a ______ spring.
Bimetallic
43
When the specific gravity is 1.\_\_\_ or greater, the ball floats and the tube appears to have a green dot, which indicates a charged battery.
1.225
44
A receiver-dryer is located on the \_\_\_\_-pressure side of the system immediately downstream of the condenser and upstream of the ______ valve.
High-pressure
Expansion Valve
45
R-134a manifold gauges can be identified by ___ with a blackstripe (high side), ____ with a black stripe (low side) and ____ with a black stripe (utility)
Red
Blue
Yellow
46
Normally, valves with _______ equalizers are used on smaller evaporators, while valves with _______ equalizers are used on larger evaporators,
Internal
External
47
When removing or installing hoses, always carry out a good _____ inspection to determine whether they have wear or damage.
Visual Inspection
48
In the centre of the thermostat is a specially formulated ___ and ________ metal pellet that is tightly encased in a heat-conducting copper cup.
Wax
Powdered
49
A _______ occurs when a live conductor comes in contact with an electrical ground.
Ground
50
\_\_\_\_\_ pump removal and replacement is not common with most front-end crashes, although it may be required when there has been a severe frontal impact.
Water
51
Some electric fans have up to _____ blades and are usually made of \_\_\_\_\_.
Eight
Plastic
52
The same is true with refrigerant, but we only deal with only two states: ______ and \_\_\_\_\_.
Liquid and Vapour
53
\_\_\_\_\_\_ links are one-time protection devices that melt to create an open circuit when current flow exceeds a certain level.
Fusible
54
For every __ C change in electrolyte temperature above or below 27 C, 0.00\_ must be added or subtracted respectively from a specific gravity reading.
0.008
55
\_\_\_\_\_\_\_ are used in automotive circuitry to start, stop or redirect current flow.
Switches
56
A \_\_\_\_\_\_-\_\_\_\_\_\_ circuit combines the features of series and parallel circuits.
Series-Parallel
57
\_\_\_\_\_\_ is the amount of electron flow in a conductor. The unit of mesurement of current is the \_\_\_\_\_\_.
Current
Ampere
58
Though we use the word cold, it is a relative term that refers only to the absence of \_\_\_\_.
Heat
59
When cutting wire, never cut wire closer than __ mm (1.5") from other splices or connectors.
40 MM
60
When the battery temperature is between 20 C and 30 C, the self discharge rate is approximately \_.\_% of its charge per day
0.2%
61
\_\_\_\_\_\_\_\_ is heat transfer through objects that are touching each other.
Conduction
62
The second function of a compressor is to compress the \_\_\_-pressure vapour to \_\_\_\_-pressure vapour.
Low-pressure
High-pressure
63
Manifold gauge sets are designed to take pressure reading when the hand valves are \_\_\_\_\_.
Closed
64
\_\_\_\_\_\_\_ belts require no adjustment, as tension is applied by the means of an automatic belt \_\_\_\_\_\_\_.
Serpentine
Tensioner
65
During dishcharge, a chemical reation is taking place within the battery. ____ from the electrolyte is converted into _____ and the specific gravity of the electrolyte decreases.
Acid
Water
66
A _____ circuit occurs when current takes a different path than was originally intended. If two or more conductors touch and current flows through that connection, a short circuit exists
Short circuit
67
Todays vehicles operate witg radiator caps that are designed to hold between __ psi and __ psi.
14psi
17 psi
68
The ______ the cross-sectioned area or diameter, the ____ resistance there is in similar types of conductors.
Larger
Less
69
The _______ cap provides functions for both pressure relief and vacuum relief and incorporates ___ valves in its constuction.
Radiator
Two
70
The ______ absorbs and stores any moisture that passes.
Desiccant
71
\_\_\_\_\_\_\_\_ wiring is not used all that often in wiring harnesses.
Aluminum
72
Negative plate grids are constructed similar to positive plate grids. They are created by coating a lead-calcium plate grid with spongy _____ (Pb).
Lead
73
\_\_\_\_\_\_ is the most common conductor used.
Copper
74
The condenser is made of _______ or copper.
Aluminum
75
\_\_\_\_\_\_ to ground may occur when a bare wire is allowed to touch any metal component of the vehicle and creates an unwanted ground.
Short to ground
76
The boiling point of water at a sea level pressure of 14.7 psi is \_\_\_°C.
100°C
77
When recovering AC ensure that the addition of recovered refrigerant will not exceed \_\_% of the conatiner's gross weight rating.
80%
78
\_\_\_\_\_\_\_\_ is done by vacuum-lowering the boiling point of the moisture, converting it to vapour (steam) and removing it.
Evacuating
79
Always wear goggles and _____ when doing work that involves opening the refrigeration.
gloves
80
Three terms relate to changing a liquid to a vapour or a vapour to a liquid: vaporization, ________ and condensation.
Evaporation
81
\_\_\_\_\_\_\_\_ is opposition to flow of electrons. _______ is measured in ohms using an ohmmeter. The symbol for ohm is \_.
Resistance
Resistance
Ω
82
A _____ \_\_\_\_ ________ (DVOM) is an electronic digital multimeter used to make electronic measurements,
Digital Volt Meter
83
\_\_\_\_\_\_ gravity is a measurement of the density of a fluid or solid compared to that of water.
Specific
84
Strip approx \_.\_mm (5/16") of insulation from each wire to be spliced.
7.5mm
85
Refrigerant can exist as a _______ or a \_\_\_\_\_, depending on its pressure and \_\_\_\_\_\_\_\_\_\_.
Vapor or liquid
Temperature
86
The fan motor is activated by a coolant temperature \_\_\_\_\_\_, but may also be triggered by a ______ that senses air conditioner operation.
Switch
Transducer
87
Never use straight _____ in a cooling system.
water
88
\_\_\_\_\_ will not carry heat and will cause hot spots and damage to the engine.
Foam
89
The _________ fan clutch uses a special silicone fluid as the medium to connect the drive and driven components when fan operation is required.
Thermostatic
90
A _______ circuit has more than one current patch. It will consist of, at minimum, a voltage source, two or more resistances connected to the voltage source by seperate paths and connecting wire.
Parallel Circuit
91
R-\_\_\_a uses metric quick-connect service ports with the high side being larger.
R-134a
92
\_\_\_\_\_\_\_ cleans and prepares the surfaces of the soldering gun tip and the electrical components
Tinning
93
Most AC failures are caused by _______ entering the system.
Moisture
94
Each cell is theoretically capable of producing a maximum of \_.\_V
2.1V
95
The thermostat pellet, which may also be called a ___ pellet element or ____ motor, sits down in the engine coolant and is connected to a valve through a piston.
Wax
Heat
96
When dealing with twisted cables, it is important that the number of twists per ____ be maintained when doing repairs.
Foot
97
Transistors and other semiconductor devices such as diodes and silicon-controlled rectifiers (SCR's) have no moving parts and as such are referred to as ____ \_\_\_\_ devices.
Solid State
98
For every _ psi of pressure applied to the cooling system the boiling point will increase \_.\_\_°F (2.12°C)
1 PSI
3.25 F
99
R-12 tanks are _____ and R-134a tanks are ___ \_\_\_\_.
White
Sky Blue
100
Up until the early 1990s, \_-\_\_, commonly known as freon, was the refrigerant used by most manufacturers.
R-12
101
R-134a oils are ___ compatible with R-12 oils.
Not
102
Corrosion deposits on a battery terminal can be cleaned with a solution of warm _____ and ______ soda.
Water
Baking soda
103
Engine coolant gives protection from freezing to -\_\_°C and a boiling temperature of about \_\_\_°C.
-37 C
107 C
104
An insulator is also called a \_\_\_\_\_\_\_\_\_.
Dielectric
105
A simple ______ circuit is the simplest type of circuit, providing only one path for current to flow.
Series
106
Most antifreeze products used today have either _______ glycol or _______ glycol base.
Ethylene Glycol
Propylene Glycol
107
An ______ tube is located between the condensor outlet and the evaporator inlet line.
Orfice
108
A _______ switch is always located in the low-pressure side of the refrigerant system and indicates evaporator pressure.
Pressure Switch
109
When a battery delivers current, it releases power by converting _______ energy to ______ energy.
Chemical energy
Electrical Energy
110
Water normally boils at 212°F (\_\_°C)
100 C
111
Radiators must be handles with care whenever they are removed and installed. ___ damage can happen even with the slightest contact with other automotive components.
fin
112
The alternative or replacement refrigerant for AC systems chosen by the automotive industry is hydrofluorocarbon based refrigerant known as \_-\_\_\_a.
R-134a
113
As a cold engine reaches its operating temperature, the coolant volume expands by atleast \_\_%.
10%
114
Battery plate grids are made of ____ and \_\_\_\_\_\_.
Lead and Calcium
115
A ______ plate strap connects the positive plates to form a positive plate strap.
Welded
116
When using a dvom for diagnostic puposes, it is very important to follow a flow \_\_\_\_\_.
chart
117
\_\_\_\_\_ radiator hoses are often ____ reinforced because the suction created by the water pump is sufficient to collapse the hose if it is not in good condition.
Lower radiator hoses
Wire reinforced
118
Batteries are considered to be 100% efficient at __ C
At 0 C, the power available drops to __ %
At -30, the power drops to __ %
27 C
65 %
20 %
119
Even after a major loss of refrigerant oil, need to add only about _____ ounces of oil.
Three ounces
120
High voltage rubber gloves are class _ @ ____ volts
0 @ 1000V
121
E = _ x \_
E= I x R
122
An _____ circuit is a break in the normal circuit path.
Open
123
The first thing to check when diagnosing a cooling system is the coolant \_\_\_\_\_.
Level
124
\_\_\_\_\_\_\_\_ wiring is the high-voltage wiring in the automobile system, which includes the ignition and spark plug wires.
Secondary
125
The _________ can be damaged by liquid refrigerant because liquids do not compress.
Compressor
126
Ohm's law states: Voltage = ______ x \_\_\_\_\_\_.
Current x Resistance
127
\_\_\_\_\_ tightening of hoses from improperly installed hose clamps can distort the rubber and will often cut the hose, causing a ______ for leaks.
Over tightening
Hotspot
128
The radiator is made up of a ____ and two \_\_\_\_\_.
core
two tanks
129
A fully charged battery has a specific gravity of 1.\_\_\_ to 1.\_\_\_ at 27 C.
1. 265
1. 280
130
The cooling potential of an AC system is normally rated in \_\_\_.
BTUs
131
\_\_\_\_\_\_ cores are usually not damaged in automobile collisions; however, damage can occur in an extremely hard side impact to the passanger's side firewall area.
Heater cores
132
The ________ plates are more chemically active than the ________ plates.
Positive
Negative
133
\_\_\_\_\_\_\_ and ______ are produced during battery charge.
Hydrogen and Oxygen
134
The only refrigerant recommended by manufactures and suppliers of OEM equiptment is R-\_\_\_a.
R-134a
135
\_\_\_\_\_ sequence and actual _____ specifications on all components in the R&I procedure must be adhered to in order to prevent leaks and provide proper operation.
Torque Sequence
Torque Specifications
136
\_\_\_ is the amount of thermal energy contained in a substance.
Heat
137
When dealing with a compressor, the suction (low side) draws refrigerant _____ from the evaporator.
Vapor
138
If the thermostat did not slow down the coolant, it would flow too quickly through the engine and cylinders and would not be able to absorb \_\_\_\_.
Heat
139
R-134a has a boiling point of -\_\_ °F (-27°C) and vaporizes at room temperature and pressure.
-16°F
140
The purpose of the ________ is to regulate the coolant temperature.
Thermostat
141
If the hybrid voltage system is over 60 volts the wires are \_\_\_\_\_\_\_, and under 60 volts the wires are \_\_\_\_.
Orange
Blue
142
On September 1, 19\_\_, Alberta Enviroment enacted its first Ozone-Depleting Substances Regulation .
1993
143
The AC system requires a storage and drying device. In an expansion valve system, this device is called a receiver/\_\_\_\_; in an orfice tube system this device is called an \_\_\_\_\_\_\_.
Dryer
Accumulator
144
Radiator caps are rated in \_\_\_.
PSI
145
A vacuum of \_\_" of mercury must be held on the system for atleast 30 mins.
29"
146
High-side hoses are generally ______ in diameter than those on the low side.
Smaller
147
Appopriate eye and hand protection must be worn as contact with sulphuric acid causes severe burns. A solution of _____ soda and _____ neutralizes electrolyte.
Baking soda
Water
148
A fully charged battery freezes at -\_\_C
At one half charge, a battery freezes at -\_\_C
If a battery is fully discharged, it freezes at -\_\_C
- 80
- 25
- 10
149
Air conditioning O-rings should be coated with ___ refrigerant oil just before installation.
525
150
The primary functions of an ________ are to cool, dehumidify and clean the air entering the passenger compartment.
Evaporator
151
Check the expiry date on the high voltage gloves; gloves have a life expectancy of ___ months and you should not use them past the due date.
six months
152
For american wire gauge (AWG) sizes, each fusible link is ___ numbers higher or ___ wire gauge sizes samller than the wire it is designed to protect.
Four
Two
153
Common areas for AC labels to be located are the plenum chamber (AC _____ box), compressor and fan shroud area.
Heater
154
Most manufacturers recommend servicing the cooling system every __ months or __ 000 km.
12 months
24 000 km
155
Tank-to-core connections are generally \_\_\_\_\_\_\_, bonded or pressed.
Soldered
156
A ______ circuit breaker resets automatically.
Cycling
157
On circuits that have solid state control modules, only use a DVOM with at least \_\_MΩ input resistance.
10MΩ
158
Causes of damage to the water pump include ________ or using straight ____ for the coolant.
Overheating
Water
159
A \_\_\_\_-\_\_\_\_\_ diode is a special-purpose diode designed to emit lights when a current is passed through it.
Light-emitting diode
160
\_\_\_\_ becomes the controlling factor of molecular movement.
Heat
161
A ____ is any component that consumes voltage to operate.
Load
162
In electrical circuits, the term ______ refers to a common return circuit to the voltage source.
Ground
163
Pressures in an R-134a system are required to be higher than in an \_-\_\_ system.
R-12
164
The _____ the pitch of the blades, the greater the airflow generated and the more _______ is required to turn them.
Greater
Horsepower
165
The symbol for voltage is _ or EMF
E
166
Never use full strength \_\_\_\_\_\_\_, as it will gel at low temperatures and will not circulate effectively at mid to high temperatures.
Antifreeze
167
The ampere hour (Ah) rating indicates the ability of a battery to supply power when the charging system has failed. This rating is the number of amps a battery delivers at 27 C for __ hours while maintaining voltage above \_\_.\_ V
20 hours
10.5 Volts
168
Heat always moves from a ______ object to a ______ object.
Hotter
Colder
169
Flexible AC hose lines should never be allowed to come within a distance of __ mm (2") of the exhaust manifold.
50 mm
170
Generally, if the system has been open for several days, the \_\_\_\_\_/\_\_\_\_\_ should be replaced.
Receiver/Dryer
171
A _______ is an electronic component that resits an electric current by producing a voltage drop between its terminals.
Resistor
172
Refrigerant tanks must be tested, stamped and tagged every ____ years at a certified testing location.
Five years
173
There are three methods of transfer: \_\_\_\_\_\_\_, convection and \_\_\_\_\_\_.
Conduction
Convection
Radiation
174
There are three states of matter: \_\_\_\_\_, ____ and \_\_\_\_\_.
Solid, liquid and vapour.
175
If the resistance of a material \_\_\_\_\_\_\_, the temperature \_\_\_\_\_\_\_.
If temperature \_\_\_\_\_\_\_\_, the resistance \_\_\_\_\_\_\_.
Increases
Increases
Increases
Increases
176
\_\_\_\_\_\_\_\_ also refers to a liquid changing into a vapour state. Heat is _______ when a liquid changes into a vapour.
Evaporation
absorbed
177
\_\_\_\_\_\_\_ losses are small amounts of current drains required to operate electrial systems such as clocks.
Parasitic losses
178
Liquid-cooled systems generally use a coolant composed of a mixture of water and \_\_\_\_\_-\_\_\_\_ based antifreeze.
Ethylene-Glycol
179
It is important to wait \_-\_\_ minutes for the high-voltage system to drain before starting any work on the vehicle.
5-15 minutes
180
A __________ expansion valve (TXV) is used on some automotive AC systems to convert high-pressure liquid from the condenser and receiver-dryer into a low-pressure atomized liquid entering the evaporator.
Thermostatic Expansion Valve
181
The electrolyte provides the required chemical reaction within the battery cells. ______ (H20) and ________ acid (H2SO4) are combined to form the electrolyte.
Water
Sulphuric Acid
182
Most _________ are made up of two or more compounds.
Insulators
183
During normal engine operation of a cooling system, energy is released from the fuel burned in the combustion chambers.
1/3 of energy goes is converted into ______ power.
1/3 goes out the ______ pipe.
1/3 becomes heat \_\_\_\_\_.
Useable power
Exhaust
Energy
184
\_\_\_\_\_\_ heat transfer is commonly caused by infrared rays.
Radiation
185
\_\_\_\_\_\_ is extremely damaging to an AC system.
Moisture
186
Fans may be made from \_\_\_\_, nylon or \_\_\_\_\_\_\_.
Steel
Fiberglass
187
Flexible AC hose lines should never be bent to a radius of less than ____ times the diameter of the hose
Four
188
If you spill refrigerant oil, flush the area with \_\_\_\_.
Water
189
\_\_\_\_ is the controlling factor in the state of matter, as it causes increased molecular motion inside a substance.
Heat
190
\_\_\_\_\_\_ glasses and vinyl or _____ gloves are recommended when handling antifreeze.
Safety Glasses
Nitrile Gloves
191
A _________ cycling switch turns the compressor on and off to maintain the correct evaporator temperature of approximately \_\_°F (0°C).
32°F
192
All automotive wiring consits of a conductor covered with an insulating material and is usually a ___ plastic coated copper cable wire.
PVC
193
Reserve capacity is the time required for a fully charged battery at 27 C under a constant __ amp draw to reach a voltage of \_\_.\_ volts.
25 amp
10.5 Volts
194
The fins and tubes are generally made from \_\_\_\_\_\_, \_\_\_\_\_\_/\_\_\_\_ or aluminum materials.
brass
copper/brass
195
If material allows current to flow freely with little to no resistance it is considered a good _________ of electricity.
Conductor
196
A _____ is the simplest semiconductor device.
Diode
197
\_\_\_\_-blade or \_\_\_-blade fans are typically found on vehicles with air conditioning.
Five-blade
Six-blade
198
Store refrigerant at temperatures below \_\_\_°F (40°C).
104°F
199
The most common types of belts found on todays vehicles are \_-\_\_\_ and _______ belts.
V-Belts
Serpentine Belts
200
Engine coolant is normally a 50/50 solution of ______ water and \_\_\_\_\_\_\_\_.
Distilled water
Antifreeze
201
During evacuation, hold the system at high vacuum for a minimum of __ minutes to remove air and moisture.
30 mins
202
A thermostat should be wide open at \_\_°C to \_\_°C above the initial opening temperature.
11 to 13 C
203
Start the battery diagnosis by performing a ______ inspection of the battery and associated components
visual
204
Cooling systems are ________ to increase the _____ point of the coolant.
Pressurized
Boiling
205
Any device that offers resistance to electron flow is a \_\_\_\_\_\_.
Resistor
206
The ______ the conductor, the ______ the resistance.
Longer
Higher
207
As the coolant in the system cools and contracts, it creates a ___ pressure.
Low pressure
208
The minimum concentration of antifreeze is \_\_% and the maximum is \_\_%.
40%
60%
209
A _______ cycling switch acts as a de-icing control by disengaging the compressor if the evaporator temperature goes to low and ice begins to form on the evaporator fins.
Thermostatic
210
During use antifreeze may become contaminated with _____ metals or _____ compounds that can contaminate soil and groundwater.
Heavy Metals
Organic Compounds
211
After refrigerant leaves an evaporator it goes to the \_\_\_\_\_\_\_.
Accumlulator
212
\_\_\_\_\_ core solder contains a flux in the core.
Rosin core
