Competency D1

Self-Test 1

1. b. SCFM is standardized using 14.7 psia (103 kPa ab)
2. d. Different sizes and assembled in series
3. b. Double acting
4. d. Intercooler
5. b. Reciprocating diaphragm
6. b. Reciprocating diaphragm
7. d. Rotary helical screw
8. e. Rotary scroll
9. d. Intake air filter
10. a. Downstream of the aftercooler
11. a. Downstream of the compressor
12. c. Air cooling and water cooling
13. b. It improves compressor efficiency.
14. b. It causes excessive compressor cycling.
15. a. It wastes energy because the compressor has to run longer.
16. d. Salt tablets
17. b. It provides additional protection from contamination.
18. b. Place the equipment with high flow requirements near the compressor.
19. c. Closed-loop networks
20. b. Octopus networks
21. b. Zero-loss drains
22. a. Pneumatic/mechanical drains; electronic demand drains; series timed electronic drains
23. a. The oil from the lubricator could cause other components to plug and become inoperable.
24. d. Bursting disk
25. a. Fusible plug
26. b. Pressure relief valve

Self-Test 2

1. 2 psi (14 kpa)
2. d. 50 000 BTU/hr.
3. c. Eye protection and air respirators
4. c. 70 kPa gauge (10 psig)
5. a. Insulation and heat tracing
6. c. High temperature–rated steel-braided, vibration isolation flex hose
7. d. Velocity fuse.
8. b. A quick disconnect coupling
9. a. Off the top of the main
10. d. All of the above
11. a. Possibility of corrosion when exposed to condensate
12. c. Possibility the material may shatter when pressurized
13. d. 95-5 soldered or brazed connections

Competency D2

Self-Test 1

1. b. Ultrasonic testing
2. d. The last 9 m (30 ft.) of piping before the point of use
3. b. 20–30%
4. e. All of the above
5. a. Equipment malfunction
6. d. Discharge temperature

Competency D3

Self-Test 1

1. b. Higher efficiency and economic gains
2. a. Reduced capacity and reduced efficiency
3. c. The condensate drains
4. b. Manual drains
5. b. 2 or 3
6. a. A clogged condenser
7. d. 8–10 psi (56 – 70 kPa)
8. d. Dusting
9. c. A 30-cm (2 ft.) whip hose
10. c. The internal orifice is the same size as the pipe size and does not have a ball or a spring.
11. d. The last 9 m (30 ft.) of piping before the point of use
12. b. 20–30%
13. b. Ultrasonic testing