Topics: All categories in the pool
1: A halide torch is most useful with a freon compression system
- to release a sticking valve
- to sweat flanges on the refrigeration piping
- to remove from from TXV's and evaporator coils
- to detect refrigeration leaks in piping joints
2: Who approves containers for refrigerants?
- E.P.A
- D.O.E
- D.O.T
- D.O.D
3: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
4: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- Low head pressure and high suction pressure
- High head pressure and low suction pressure
- Low suction pressure and low discharge pressure
- High suction pressure and high discharge pressure.
5: A tachometer is an instrument used to measure
- static pressure
- RPM
- air velocity
- speed
6: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
7: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- merge
- purge
- surge
- splurge
8: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- naphthalene, mixed, and paraffin
- animal, vegetable, and mineral
- animal, vegetable, and castor
9: A restaurant is classified as a
- commercial occupancy
- mixed occupancy
- large mercantile occupancy
- public assembly occupancy
10: Which occupancy can ammonia be used in?
- industrial
- depends on the quantity of freon
- commercial
- redifential
11: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 330
- 110
- 1,000
- 6.6
12: How many gallons of water per pound of ammonia do you need?
- 5
- 1
- 15
- 20
13: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 18
- 33
- 22
14: A single pole-double throw switch uses how many wires?(excluding the ground)
- 5
- 4
- 3
- 2
15: When must refrigeration system covered by the code be inspected?
- Annually and when installed
- Not required
- Upon installation
- Annually
16: When the compressor is below the condensor
- traps are not needed on this type of system
- traps are needed on the discharge line
- traps are needed on the oil return line
- traps are needed on the suction line
17: Gauge pressure is
- Force of pressure above that of atmosphere
- Barometric pressure
- Absolute pressrue
- Atmospheric pressure
18: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 5/8"
- 3/4"
- 3/8"
- 1/2"
19: Which refrigerant class listed below is the most flammable?
- B2
- A3
- C3
- A2
20: The proper location for an oil separator is between the
- evaporator and compressor
- condenser and receiver
- compressor and condenser
- receiver and metering device
21: Secondary refrigerants are usually
- Prestone anti-freeze
- alcohol
- water or brine
- expensive
22: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
23: What is the boiling point of refrigerant governed by?
- P&T relationship
- Evaporator temperature
- Condenser sub-cooling
- Compressor RPM's
24: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 550 lbs
- 660 lbs
- 55 lbs
- 330 lbs.
25: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above