F-Gas English Low GWP
All questions
HFC | Flammable | CO₂ | NH₃
Easy questions |
Medium questions |
Difficult questions
1
Easy
What is the log(p)-h diagram for CO₂ used for?
| To detect leaks |
| To regulate pressure |
| To measure temperature |
| For analysing thermodynamic processes in a refrigeration system |
2
Easy
What can be read from the log(p)-h graph?
| Pressure, enthalpy, temperature and state of the refrigerant |
| Only the amount of refrigerant |
| Only the temperature |
| Only the humidity |
3
Easy
What are CO₂ saturation tables used for?
| To determine the oil quantity |
| To measure humidity |
| To regulate the compressor |
| To determine the relationship between temperature and pressure at saturation |
4
Easy
What does the CO₂ saturation state mean?
| A state in which the refrigerant is only a gas |
| Equilibrium between the liquid and vapour phases |
| A state of high pressure |
| Dry ice state |
5
Easy
Why is understanding the log(p)-h graph particularly important for CO₂?
| As CO₂ systems operate in different modes (sub- and transcritical) and require detailed analysis |
| It is only used for design purposes |
| It doesn’t matter |
| It only applies to NH₃ |
6
Easy
Why do CO₂ systems require precise pressure control?
| Due to significant pressure changes with temperature fluctuations |
| Because there are no valves |
| Due to low pressures |
| They do not require control |
7
Easy
What is the function of high-pressure control valves in CO₂ systems?
| They lower the evaporator temperature |
| They regulate oil flow |
| They are used to store the refrigerant |
| They control the pressure on the high-pressure side and optimise system operation |
8
Easy
Why do CO₂ systems require more advanced automation than traditional systems?
| Because there are no valves |
| Due to low pressures |
| They do not require automation |
| Due to the need for precise control of pressure and temperature |