Topics: All categories in the pool
1: A Lithium-bromide system is an absorption system that
- uses water as a absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent
2: The discharge relief valve is located (9.4.6)
- between the compressor and oil separator
- between the compressor and reciever
- on top of the condensor
- between the compressor and the stop valve
3: Ammonia belongs to Group
- B-2
- A-2
- A-1
- B-1
4: Which refrigerant is lighter than air?
- R-123
- R-11
- R-134a
- R-717
5: Pressure relief valves shall be marked with the data from
- Section XIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
6: Which winding have the most turns?
- depends on the motor phase
- Start
- they have equal amount of turns
- run
7: It takes how many BTU/hr to melt one pound of ice at 32F
- 970
- 212
- 144
- 180
8: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
9: If the power element on an expansion valve should lose its charge, the valve would
- Over feed
- Stay open
- Close
- Under feed
10: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- ammonia
- Lithium bromide
- CFC-11
- HCFC-123
11: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 70.8 psig
- 66.1 psig
- 43.3 psig
- 50.2 psig
12: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
13: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
14: "R" represents ___ in the Ohm's law formula
- amperage
- resistance
- capacitance
- voltage
15: R-12 is
- dichloromethane
- trichlorofluoromethane
- dichlorodifluoromethane
- dichlorofluoromethane
16: 1 Watt = ______ BTU's?
- 4.482
- 3.412
- 7.216
- 12
17: Capacity control on a centrifugal compressor is accomplished by the
- pre-rotational guide vanes
- post-rotational guide vanes
- check valves
- slide vanes
18: Trichlorofluoromethane is the name of what refrigerant?
- R-11
- R-113
- R-12
- R-502
19: Increasing superheat will do what to your frost line?
- Could either increase or decrease depending on the load conditions
- Increasae
- Nothing
- Decrease
20: Which creates more of a heat load?
- 70% RH
- 30% RH
- 90% RH
- 50% RH
21: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
22: How many CFMs are required per square foot of commercial office occupied space
- 15 CFM
- .5 CFM
- 5 CFM
- 20 CFM
23: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 350
- 100
- 250
- 400
24: Dew point is
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
- the temperature of air of 50% RH
- the temperature below which water vapor in the air will start to condense
25: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above