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WorksheetsMobile Heating and Air Conditioning
Total questions: 29
Worksheet time: 30mins
Name
Class
Date
1.
The amount of heat needed to raise the temperature of 1 pound of water 1 degree Fahrenheit (at sea level)
a)
1 BTU
b)
convection
c)
Broil
d)
100 Kelvin
2.
An objects heat and its temperature are always the same.
a)
True
b)
False
3.
The amount of heat needed to change states is known as _____ .
a)
Latent Heat
b)
Radiation
c)
fire
d)
cooking
4.
A material that slows heat transfer is called a ______ .
a)
conductor
b)
blanket
c)
protector
d)
insulator
5.
____________ is the measurement of how hot or cold something feels.
a)
BTU
b)
freezing
c)
temperature
d)
comfort
6.
The ___________ the pressure on a liquid, the ________ its boiling point.
a)
higher, higher
b)
higher, lower
c)
lower, higher
7.
The boiling point of R-134a is _____________.
a)
16 degrees Fahrenheit
b)
-16degrees Celcius
c)
-16degrees Fahrenheit
d)
27degrees Celcius
8.
Heat transferred from the engine to the _________ is directed to the heater core in the passenger compartment.
a)
radiator
b)
coolant
c)
thermostat
d)
blower motor
9.
The air conditioning compressor _____________ vaporized refrigerant and allows it to flow to the condenser.
a)
pressurizes
b)
cools
c)
supplies
d)
cleans
10.
Adding pressure to a liquid _______ its boiling point. Adding pressure to a vapor _______ its temperature.
a)
raises, raises
b)
lowers, lowers
c)
raises, lowers
d)
lowers, raises
11.
In the evaporator, refrigerant is under very low pressure and is much colder than the air inside of the vehicle. Because of this, heat transfers from the ________ to the _______, causing the refrigerant to _______.
a)
refrigerant, vehicle, vaporize
b)
vehicle, refrigerant, condense
c)
vehicle, refrigerant, vaporize
d)
refrigerant, vehicle, condense
12.
Which HVAC system controls the force of air flowing into the passenger compartment?
a)
Refrigeration
b)
Air distribution
c)
Heating and cooling
d)
Air intake
13.
A(n) __________ filters any moisture that might enter the HVAC system.
a)
refrigerant flow control device
b)
condenser
c)
refrigerant storage device
d)
evaporator
14.
The Compressor discharge hose uses a _____________ diameter than the suction hose.
a)
larger
b)
smaller
c)
identical
d)
opposite
15.
CAUTION! High-pressure tubing near the compressor is extremely ________.
a)
expensive
b)
HOT
c)
fragile
d)
rare
16.
The air conditioning compressor acts as the ________ of the system, keeping refrigerant circulating during air conditioning system operation.
a)
Top
b)
Bottom
c)
Pump
d)
brain
17.
The following is NOT a type of common automotive air conditioning compressor.
a)
swash-plate
b)
wobble-plate
c)
scroll
d)
screw
18.
A low-pressure cutoff switch is wired in series with the compressor clutch circuit and opens when insufficient pressure exists on
system high side due to _________.
system high side due to _________.
a)
Loss of refrigerant
b)
Extreme high temperatures
c)
Refrigerent overcharging
d)
clutch failure
19.
The A/C compressor pressure relief valve is located on rear compressor head and opens to release pressure when ________ refrigerant pressure exceeds a designed limit.
a)
Liquid
b)
discharge
c)
R-12
d)
contaminated
20.
R-134a A/C systems use a different refrigerant oil than older vehicles with R-12 systems. This is known as ______ oil.
a)
dye
b)
castor
c)
PAG
d)
Ester
21.
Where is the TXV installed in the refrigeration system?
a)
At the condenser inlet and outlet tubes
b)
Between the evaporator outlet and the compressor inlet
c)
At the evaporator inlet and outlet fittings
d)
Between the evaporator outlet and condenser inlet
22.
Which of the following is NOT a common type of automotive A/C Evaporator?
a)
S pattern
b)
P or Parallel pattern
c)
U pattern
d)
XX pattern
23.
Variable displacement compressors are controlled by cycling them ON and OFF according to the pressure in the low pressure side of the refrigeration system.
a)
True
b)
False
24.
The pressure cycling switch indicates compressor pressure.
a)
True
b)
False
25.
The two major functions of the compressor are to circulate refrigerant and to compress ____________.
a)
Low-pressure refrigerant vapor into hot, high temperature vapor
b)
High-pressure refrigerant vapor into high-temperature, low temperature liquid
c)
Low-pressure refrigerant liquid into hot, high temperature vapor
d)
Low-pressure refrigerant liquid into hot, high temperature liquid
26.
The __________ compressor is controlled by cycling it ON and OFF.
a)
actuator-vane
b)
scranton-type
c)
fixed displacement
d)
variable displacement
27.
The __________is placed ahead of the radiator, allowing it to receive maximum air flow from vehicle movement and coolant fan operation.
a)
condenser
b)
compressor
c)
evaporator
d)
orifice tube
28.
Orifice tube failure is usually indicated by _______ discharge pressure and _______ evaporator cooling.
a)
high, excessive
b)
low, excessive
c)
low, insufficient
d)
high, insufficient
29.
The receiver-dehydrator is always located on the ________ pressure side of the refrigeration systems and is mounted ______________.
a)
low, next to the condenser or prior to the TXV
b)
low, after the evaporator
c)
high, after the evaporator
d)
high, next to the condenser or prior to the TXV
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