Topics: All categories in the pool
1: How many closing forces operate a thermostatic expansion valve?
- 1
- 4
- 2
- 3
2: Liquid line filter-driers on a 410A system must be rated for no less than
- 400 psig
- 1000 psig
- 600 psig
- 200 psig
3: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 24
- 18
- 10
- 15
4: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
5: A pressure relief should be located at least _______ from windows and doors.
- 15'
- 25'
- 20'
- 30'
6: Refrigerants shall be classified by
- toxicity and flammability
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- color codes
7: A chiller entering and leaving temperature difference is?
- 5 degrees F
- 20 degrees F
- 10 degrees F
- 50 degrees F
8: What is the amp draw of a 40 VA transformer at 24 volts
- 1,000 amps
- 1K amps
- 1.6 amps
- 106 amps
9: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
10: How many gallons of water per pound of ammonia do you need?
- 5
- 1
- 20
- 15
11: What would be the classification of a prison?
- Large mercantile
- Institutional
- Industrial
- Place of assembly
12: What is the voltage of each leg of a 480 Volt three-phase motor?
- 240v
- 277v
- 120v
- 208v
13: What type of material can't be used on the outlet of a relief valve?
- Stainless steel
- Magnesium alloy
- Copper
- PVC
14: The main purpose of the accumulator is to
- provide space for vapor to accumulate
- store liquid refrigerant
- prevent liquid slugs at the compressor
- provide space for the accumulation of oil and containminants
15: The measurement of heat in a particular substance is
- specific heat
- enthalpy
- latent heat
- sensible heat
16: The principle used in continuous type absorption systems is
- Ohm's Law
- Dalton's Law
- Boyle's Law
- Charles's Law
17: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Notify the AHJ to let them know that the system been inspected
- Notify the Fire Marshal that the system has been inspected and approved
- Inspector leaves a metal tag with a certification listed on it
18: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
19: Name a reason that does not cause reduced condenser air quantity
- Prevailing winds
- Dirty Coil
- Dirty fan blades
- High ambient temperature
20: Which refrigerant is lighter than air?
- R-123
- R-134a
- R-717
- R-11
21: Pipe identification labels are required when the system contains more than
- 65 lbs
- 120 lbs
- 55 lbs
- 110 lbs
22: Which of the following controllers would you expect to be most sensitive to temperature changes?
- low voltage t-stat
- immersion controller
- aquastat
- line voltage t-stat
23: What is a high-side float?
- Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
- Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
- Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
- An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
24: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
25: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 365 psig
- 125 psig
- 255 psig
- 327 psig