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AIR CONDITIONING

Total questions: 23

Worksheet time: 13mins

Name
Class
Date
1.
In a typical system, within which component would the evaporation of refrigerant take place?
a)
Condenser
b)
Receiver dryer
c)
Evaporator
d)
Compressor
2.
What does MAC stand for?
a)
Mobile Air Conditioning
b)
Mechanical Air Conditioning
c)
Mobile Air Compressor
d)
Mechanical Air Compressor
3.
Where would you expect to find a high pressure liquid within an AC system?
a)
Between the compressor and the TXV
b)
Between the TXV and the Evaporator
c)
Between the compressor and the condenser
d)
Between the Condenser and the TXV
4.
How would you know the air con gas has been fully recovered from the system? 
a)
The gauge on the high pressure side reads a positive pressure
b)
The gauge on the low pressure side reads a negative pressure
c)
Both gauges read zero pressure at the end of the recovery process
d)
Both gauges read a positive pressure of 20 Bar at the end of the recovery process
5.
Which of the following would be carried out to confirm a system contained no refrigerant?
a)
Press the service port valve on the low pressure side and listen for a gas leak
b)
Connect the gauges to both high and low pressure ports to confirm a vacuum is present
c)
Connect the Air Conditioning equipment and carry out a full recovery
d)
Connect the gauges to both high and low pressure ports to confirm no pressure is present
6.
What type of refrigerant is R134a?
a)
CFC
b)
HCFC
c)
HSBC
d)
HFC
7.
What does COSHH stand for?
a)
Control of Substances Hazardous to health
b)
Company omissions of safe Health hazards
c)
Control of solutions hazardous to health
d)
Control of Substances which are health hazardous
8.
What does a TXV do?
a)
Cleans, dries and filters the refrigerant
b)
It controls the quantity of refrigerant entering the evaporator
c)
Allows for an increase in pressure and temperature prior to entering the condenser
d)
It acts as a safety device if the compressor is over pressuring the system
9.
If contamination within an air conditioning system is suspected and a flushing procedure is to be carried out what component should also be changed?
a)
Compressor
b)
Receiver Drier
c)
TXV
d)
Condenser
10.
What are the impacts on the environment of fluorinated greenhouse gases?
a)
Contributes to the formulation of acid rain
b)
Contributes to the global warming
c)
Mixes with the Nitrogen within the atmosphere to create a toxic substance, Nox
d)
Has little or no detrimental effect
11.
How could you confirm the type of refrigerant present in an air conditioning system?
a)
The odour the refrigerant emits when released to atmosphere
b)
The colour of the refrigerant which is visible through the sight glass in the top of the receiver drier
c)
By checking the identifier label located on the vehicle
d)
It does not matter as R12 and R134a are interchangeable
12.
Assuming normal atmospheric pressure at what temperature would R134a boil?
a)
-26.3 degrees C
b)
-26.3 degrees Fahrenheit
c)
-103.3 degrees C
d)
-103.3 degrees Fahrenheit
13.
How should R134a be stored to meet safety requirements?
a)
Under pressure as a vapour
b)
Under pressure as a gas
c)
Under no pressure as a vapour
d)
Under no pressure as a gas
14.

Where would you expect to find a high pressure liquid within an AC system?

a)

Between the compressor and the Thermal Xpansion Valve

b)

Between the Thermal Xpansion Valve and the Evaporator

c)

Between the compressor and the condenser

d)

Between the Condenser and the Thermal Xpansion Valve

15.
The air conditioning compressor _____________ vaporized refrigerant and allows it to flow to the condenser. 
a)
pressurizes
b)
cools
c)
supplies
d)
cleans
16.

Which of the following is true about the optimum effective temperature for human comfort?

a)

Same in winter and summer

b)

Not dependent on season

c)

Lower in winter than in summer

d)

Higher in winter than in summer

17.

The heat production from a normal healthy man when asleep is about _________

a)

50 W

b)

40 W

c)

70 W

d)

60 W

18.

When the heat stored in the body is ________ the human body feels comfortable.

a)

zero

b)

infinite

c)

positive

d)

negative

19.

Which of the following does not mainly a factor of dependency for the degree of warmth or cold?

a)

Relative humidity

b)

WBT

c)

Air velocity

d)

DBT

20.

The effective temperature increases with a decrease in relative humidity at the same DBT.

a)

True

b)

False

21.

What is the value of optimum effective temperature in winter?

a)

17

b)

18

c)

19

d)

20

22.

What is the value of the optimum effective temperature in summer?

a)

23

b)

22

c)

21

d)

24

23.

Which of the following provides the relationship between the optimum indoor effective temperature and optimum outdoor effective temperature?

a)

Clothing

b)

Occupants

c)

Duration of stay

d)

Climatic and seasonal differences

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