F-Gas Cat 3&4 Flashcards
The specific volume of a substance is measured in is
m^3/kg
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
C. Heat content per unit mass
The SI unit of standard measurement for mass is?
Kilogrammes
The SI unit for measuring density is?
Kg/m^3
The definition of enthalpy is
Heat content in kJ/Kg
Absolute temperature is measured in degrees?
Kelvin
The function of an evaporative condenser is to?
reject latent heat to change vapour to liquid
The function pf the evaporator it to
convert refrigerant from a low pressure saturated mixture to a superheated vapour
What id the function of a TEV?
maintain a constant superheat
when is sub cooling established?
when refrigerant liquid is cooled below its boiling point.
if a refrigerant is superheated then it is a?
vapour above its saturation temperature
What is the function of a compressor?
circulate refrigerant vapour and increase pressure
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
D. R407c
In which condition will refrigerant provide a clear liquid line sight glass?
subcooled liquid
A liquid line sigh glass is continuously sowing bubbles, this would mean?
shortage of refrigerant
what is the main environmental issue the the Kyoto protocol address?
climate change
which of the following refrigerants have the least impact on direct global change?
A. R134a
B. R404a
C. R717
D. R744
C.717
The coefficient of performance of a cooling system is calculated by?
refrigeration effect/ compressor work done
As the difference between condensing temperature and evaporating temperature decreases;
work done decreases and discharge temperature decreases
which of the following refrigerant does the kyoto protocol not cover?
A. Hydrofluorocarbons
B. Carbon Dioxide
C. Methane
D. Hydrocarbons
D. Hydrocarbons (HCs)
Which of the following refrigerant types are covered by the kyoto protocol?
A. HC
B. CFC
C. HCFC
D.HFC
D.HFC
Which of the following refrigerants has the highest GWP impact?
A. R22
B.R134a
C R290
D.R404a
D R404a
Which of the following refrigerants has the lowest GWP impact?
A. R134a
B.R404a
C R407
D.R410a
A R134a
Under F-Gas regulations a system containing 7 tonnes CO2e or more must be?
leak tested every 12 months and a record kept
