Topics: All categories in the pool
1: A Low-Probability System
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
2: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
3: What measures gas pressure?
- Hygrometer
- Manometer
- Barometer
- Hydrometer
4: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
5: What device measures the specific gravity of a substance?
- Hydrometer
- Manometer
- Hygrometer
- Thermometer
6: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
7: A pressure relief should be located at least _______ from windows and doors.
- 15'
- 20'
- 30'
- 25'
8: The actual expansion curve of compression follows most nearly which one of the following curves?
- Volume Temperature
- Isothermal
- Adiabatic
- Pressure Temperature
9: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UM” and “UV”
- “UV”
- “UL”
- “U” or “UM”
10: "P" represents ______ in the Watt's law formula
- watts
- voltage
- reactance
- amperage
11: Name a reason that does not cause reduced condenser air quantity
- High ambient temperature
- Dirty fan blades
- Dirty Coil
- Prevailing winds
12: How many volts would you read on a 480V system phase to phase?
- 480
- 1/3 the voltage
- 277
13: RPM's of a centrifugal compressor are at approximately?
- 500
- 10,000
- 15,000
- 30,000
14: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
15: 1 HP = ____ Watts?
- 3,412
- 11,239
- 3.1416
- 746
16: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- green
- red
- blue
- orange
17: Stop valves shall not be permitted between the system and the
- relief valve
- bleed valve
- service valve
- condenser
18: Refrigerant restricted in 2004 but used for transition for decades:
- R-22
- R-123
- R-11
- R-134A
19: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
20: A mercury bulb controller is not recommended for
- use where vibration is severe
- low voltage use
- line or low voltage use
- line voltage use
21: 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
22: On a centrifugal compressor, stationary diffuser vanes are needed to
- stop gas flow
- prevent high pressure on the packing
- convert velocity energy to pressure
- increase the clearance space
23: Which refrigerant class listed below is the most flammable?
- A-3
- C-3
- B-2
- A-1
24: Which creates more of a heat load?
- 50% RH
- 30% RH
- 70% RH
- 90% RH
25: Class A refrigerants are considered
- flammable
- toxic
- non-toxic
- non-flammable