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FREE AND STUDY GAMES ABOUT COMMERCIAL A/C EXAM
QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -27 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: Two basic categories of chillers are?
Answer:
Compression cycle and absorption
Question 2: ASHRA Winter/Summer
Answer:
75F deg. 50 RH
Question 3: Type of cooling towers
Answer:
1) natural-draft 2) forced-draft 3) induced-draft
Question 4: Two types of fan are used for cooling tower
Answer:
1) propeller 2) centrifugal
Question 5: Secondary HVAC system: Three Catogries
Answer:
1)All air system
2) 3)
Question 6: Absorption refrigeration cycle components
Answer:
1) evaporator 2) absorber 3) concentrator 4) condenser
Question 7: The purge unit on a low-pressure chiller removes
Answer:
Noncondensables
Question 8: How capacity control accomplished on a centrifugal compressor?
Answer:
Inlet vane
Question 9: Three environment functions
Answer:
1) size space 2) Geographical location 3) specific location
Question 10: Most efficient of centrifugal fan
Answer:
Airfoil
Question 11: Output device final condition?
Answer:
Feedback
Question 12: Screw compressors can range from _____tons
Answer:
50 to 700 tons
Question 13: Control the capacity of a screw compressor
Answer:
Slide valve
Question 14: Four compressors commercial A/C system
Answer:
1) scroll 2) screw 3) reciprocate 4) centrifugal
Question 15: Three environment functions
Answer:
1) temperature 2) Humid 3) air flow
Question 16: Start sequence chiller system 1 and 2
Answer:
1) systems switch closes, energizing chilled-water pump contractor coil 2) chilled-water pump starts. Auxiliary contacts close and start condenser water pump
Question 17: Three types of axial fan
Answer:
1) propeller 2) tube-axial 3) vane-axial
Question 18: What is the purpose of the purge unit?
Answer:
Remove non-condensable
Question 19: The type of refrigerants used in low pressure chiller
Answer:
R-11, R-113, R-123
Question 20: Type of centrifugal fan
Answer:
1) forward-curved 2) backward-curved 3) backward-inclined 4) airfoil
Question 21: The compressor used for low pressure chillers
Answer:
Centrifugal Question 22: Chillers operate with a chill water supply temp of ____deg F and a return water temp of___deg F
Answer:
45 deg F, 55 deg F
Question 23: Damper control and VAV system, how do they control?
Answer:
cooling, t-stat's output varies to modulate the VAV box damper change from min to max, increase air 55F balance heat gain. Heating, air volume decrease to min., heating is introduced by heheat coil, baseborad radiation or both Question 24: What is the common refrigerant used in absorption refrigeration machines?
Answer:
Water
Question 25: List type of metering device used on high pressure chiller?
Answer:
1) TXV
2) orifice 3) electronic stop
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