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Home └Course 10 — Safety, Refrigerants and Standards └Quiz 10: check your understanding

Course 10 — Safety, Refrigerants and Standards

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Quiz 10: check your understanding

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1. What is the correct order in LOTO?
Lock, isolate, test, tag Isolate, lock, tag, prove dead Test, tag, isolate, lock Tag, isolate, work, lock
2. Why wait after switching off an inverter heat pump?
Fan must stop cooling DC bus capacitors hold charge Refrigerant must settle Controller must save data
3. Which gas is used to pressure test a refrigerant circuit?
Oxygen Compressed air Dry nitrogen LPG
4. In "A2L", what does "A" mean?
Approved Lower toxicity Air-cooled High flammability
5. Which refrigerant is class A3?
R32 R744 R290 R134a
6. Which refrigerant is B2L?
R717 R410A R1234yf R513A
7. Where does leaked R290 collect?
Ceiling Evenly in room Floor level and pits Outside only
8. Approximate critical temperature of CO₂?
0 °C 31 °C 71 °C 100 °C
9. Maximum liquid fill of a recovery cylinder?
50 % 80 % 95 % 100 %
10. Which standard covers domestic hot water heat pump testing?
EN 16147 ISO 13256 ISO 817 EN 378