Topics: All categories in the pool
1: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections 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 from a failed connection or component of such system
2: When using nitrogen for brazing, the pressure should be:
- Very low
- 125 psig
- 50-100 psig
- Slightly below atmospheric
3: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
4: Which refrigerant class listed below is the most flammable?
- B2
- A3
- A2
- C3
5: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 100
- 90
- 80
- 110
6: What type of copper is not permitted on refrigeration systems?
- Type M
- Type N
- Type L
- Type K
7: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
8: Electricity involves the movement of electrons in atoms
- True
- False
9: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Have it inspected
- Document the superheat and subcooling reading
10: Booster compressors, pump refrigerant into the
- receiver
- low side of the primary compressor
- heat & plate heat exchanges
- high side of the secondary compressor
11: What is used to check very low pressure?
- Velometer
- Hygrometer
- Manometer
- Hydrometer
12: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Simple
- Cascade
- Low pressure
- R-414B
13: The measurement of heat in a particular substance is
- specific heat
- latent heat
- sensible heat
- enthalpy
14: How are safety controls wired in a circuit?
- Either series or parallel
- Parallel
- Series
- Series/parallel
15: High pressure controls should be set no higher than
- 10% of set point
- 90% of set point
- 25% of set point
- 80% of set point
16: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
17: How many refrigerant classifications are there for toxicity?
- 5
- 1
- 2
- 3
18: Crankcase heaters are energized
- when the compressor is off
- while the compressor is running
- to allow easy compressor start-up
- to prevent compressor freeze-up
19: What is an example of institutional occupancy?
- Football stadium
- Shopping mall
- Dorms
- Hospital
20: What would be the classification of a prison?
- Institutional
- Industrial
- Place of assembly
- Large mercantile
21: By using nitrogen within a pipe during brazing operation,
- Discoloration is prevented
- Copper oxide formation is prevented
- Exterior scale formation is minimized
- The explosion hazard is confined
22: Ammonia is under what safety classification?
- A3
- B2
- B1
- B3
23: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- lower
- the same
- higher
- there is no Group B1 refrigerants
24: The heat picked up in the evaporator must equal to
- the heat giving by the condenser
- the heat of compression
- the heat lost by the medium being cooled
- the heat gained by the condenser
25: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
- Contacts, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.