CDC 3E151 - HVAC/R JOURNEYMAN
VOLUME 1 (Volume 1 - HVAC/R
FUNDAMENTALS)- Qs & As
1. (010) What is done immediately after the tubing has been cut with a tube cutter?
Correct Ans-Use the tube reamer on the cutter to remove the burr inside the tube
2. (010) The first step in cutting tubing with a hacksaw is to select which hacksaw blade
Correct Ans-32 teeth per inch
3. (011) After slipping the nut on the tubing the next step is to Correct Ans-insert the end
of the tubing into the correct-sized hole in the flaring block
4. (011) When fabricating a single flare, the next step after you tighten the block's clamp is
to Correct Ans-place refrigerant oil on the flaring cone
5. (012) The gate valve is not suitable for throttling flow because Correct Ans-the
velocity of flow against the partly opened valve may cause vibration and damage
6. (013) What does the mixing valve do when the leaving water temperature rises above set
point? Correct Ans-It will throttle back the hot water and "open up" the cold water
7. (013) What position should the service valve be in during normal operation? Correct
Ans-Back seated
, 8. (013) Cracking a service valve will Correct Ans-prevent a pressure rush
9. (014) What type of cross connection exists if the spout on a sink faucet extends below the
overflow rim? Correct Ans-Indirect
10. (014) What hazard may cause a significant change in water quality? Correct Ans-
Class 2
11. (015) When should the air gap be used? Correct Ans-Whenever possible
12. (016) To completely burn acetylene, it is not necessary to supply all 1 1/2 parts of oxygen
because Correct Ans-a portion of the oxygen is derived from the air surrounding the
flame
13. (016) When will the safety plugs in acetylene cylinders melt? Correct Ans-212 to 220
F
14. (016) Care must be taken to prevent propane/butane torch hose damage to Correct
Ans-prevent a possible fire
15. (016) What is the last step in operating the propane/butane torch? Correct Ans-Store
the assembly in a safe and cool place
VOLUME 1 (Volume 1 - HVAC/R
FUNDAMENTALS)- Qs & As
1. (010) What is done immediately after the tubing has been cut with a tube cutter?
Correct Ans-Use the tube reamer on the cutter to remove the burr inside the tube
2. (010) The first step in cutting tubing with a hacksaw is to select which hacksaw blade
Correct Ans-32 teeth per inch
3. (011) After slipping the nut on the tubing the next step is to Correct Ans-insert the end
of the tubing into the correct-sized hole in the flaring block
4. (011) When fabricating a single flare, the next step after you tighten the block's clamp is
to Correct Ans-place refrigerant oil on the flaring cone
5. (012) The gate valve is not suitable for throttling flow because Correct Ans-the
velocity of flow against the partly opened valve may cause vibration and damage
6. (013) What does the mixing valve do when the leaving water temperature rises above set
point? Correct Ans-It will throttle back the hot water and "open up" the cold water
7. (013) What position should the service valve be in during normal operation? Correct
Ans-Back seated
, 8. (013) Cracking a service valve will Correct Ans-prevent a pressure rush
9. (014) What type of cross connection exists if the spout on a sink faucet extends below the
overflow rim? Correct Ans-Indirect
10. (014) What hazard may cause a significant change in water quality? Correct Ans-
Class 2
11. (015) When should the air gap be used? Correct Ans-Whenever possible
12. (016) To completely burn acetylene, it is not necessary to supply all 1 1/2 parts of oxygen
because Correct Ans-a portion of the oxygen is derived from the air surrounding the
flame
13. (016) When will the safety plugs in acetylene cylinders melt? Correct Ans-212 to 220
F
14. (016) Care must be taken to prevent propane/butane torch hose damage to Correct
Ans-prevent a possible fire
15. (016) What is the last step in operating the propane/butane torch? Correct Ans-Store
the assembly in a safe and cool place
