F-Gas Cat 3&4

Question 1

The specific volume of a substance is measured in is

Answer 1

m^3/kg

Question 2

Which of the following terms describes enthalpy?
A. Heat content per unit volume
B. Heat content per unit temperature
C. Heat content per unit mass
D. Heat content per unit time

Answer 2

C. Heat content per unit mass

Question 3

The SI unit of standard measurement for mass is?

Answer 3

Kilogrammes

Question 4

The SI unit for measuring density is?

Answer 4

Kg/m^3

Question 5

The definition of enthalpy is

Answer 5

Heat content in kJ/Kg

Question 6

Absolute temperature is measured in degrees?

Answer 6

Kelvin

Question 7

The function of an evaporative condenser is to?

Answer 7

reject latent heat to change vapour to liquid

Question 8

The function pf the evaporator it to

Answer 8

convert refrigerant from a low pressure saturated mixture to a superheated vapour

Question 9

What id the function of a TEV?

Answer 9

maintain a constant superheat

Question 10

when is sub cooling established?

Answer 10

when refrigerant liquid is cooled below its boiling point.

Question 11

if a refrigerant is superheated then it is a?

Answer 11

vapour above its saturation temperature

Question 12

What is the function of a compressor?

Answer 12

circulate refrigerant vapour and increase pressure

Question 13

Which of the following refrigerant is most likely to suffer from changes in its composition after leakage from a static system?
A.R22
B.R134a
C.R245fa
D. R407c

Answer 13

D. R407c

Question 14

In which condition will refrigerant provide a clear liquid line sight glass?

Answer 14

subcooled liquid

Question 15

A liquid line sigh glass is continuously sowing bubbles, this would mean?

Answer 15

shortage of refrigerant

Question 16

what is the main environmental issue the the Kyoto protocol address?

Answer 16

climate change

Question 17

which of the following refrigerants have the least impact on direct global change?
A. R134a
B. R404a
C. R717
D. R744

Answer 17

C.717

Question 18

The coefficient of performance of a cooling system is calculated by?

Answer 18

refrigeration effect/ compressor work done

Question 19

As the difference between condensing temperature and evaporating temperature decreases;

Answer 19

work done decreases and discharge temperature decreases

Question 20

which of the following refrigerant does the kyoto protocol not cover?
A. Hydrofluorocarbons
B. Carbon Dioxide
C. Methane
D. Hydrocarbons

Answer 20

D. Hydrocarbons (HCs)

Question 21

Which of the following refrigerant types are covered by the kyoto protocol?
A. HC
B. CFC
C. HCFC
D.HFC

Answer 21

D.HFC

Question 22

Which of the following refrigerants has the highest GWP impact?
A. R22
B.R134a
C R290
D.R404a

Answer 22

D R404a

Question 23

Which of the following refrigerants has the lowest GWP impact?
A. R134a
B.R404a
C R407
D.R410a

Answer 23

A R134a

Question 24

Under F-Gas regulations a system containing 7 tonnes CO2e or more must be?

Answer 24

leak tested every 12 months and a record kept

Question 25

Which F-Gas cat qualification is required to recover refrigerated from an air conditioning system which has a charge of 7.5kg of R407c?

Answer 25

cat 1

Question 26

indirect global warming results from

Answer 26

refrigerant systems that are inefficient

Question 27

direct global warming results from

Answer 27

refrigerant leaking into the atmosphere