Topics: All categories in the pool
1: Horizontal piping should be run level.
- No, unless the supervisor on the job says so.
- False
- Yes, if the condenser is located above the evaporator
- True
2: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
3: Gauge pressure is
- absolute pressure
- force of pressure above that of atmospheric
- what a gauge reads when checking pressures on a chilled water system.
- atmospheric pressure
4: Low-side system leaks in a low-pressure chiller will often result in
- water being pulled into the system
- nitrogen leaking out of the system.
- air being pulled into the system
- system refrigerant leaking from the system
5: Most CFC's are
- flammable
- inert but toxic
- toxic
- inert
6: In an ammonia refrigerating system, how is oil pressure adjusted?
- Outlet of pump
- Inlet of pump
- Spring tension of a pressure regulating valve
- Both a & b are correct
7: Color is important in oil because
- it makes sight glasses easy to read
- allows you to see into crankcase
- can tell us something about the refining of oil
- it indicates the viscoisty.
8: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
9: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- 2
- 2.5
- There isn't enough information to answer.
- 1250
10: What is the intention of the word “should” as used in the code?
- A mandatory requirement
- A recommendation or advisory guideline
- A technician’s choice of how it should be done
- None of the Above
11: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- annually
- bi-annually
- quarterly
12: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 1/2"
- 3/4"
- 3/8"
- 5/8"
13: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
14: A High-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
15: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Dry bulb temperature
- Wet bulb temperature
- Saturated temperature
- Critical temperature
16: "E" references ____ in the Ohm's law formula
- voltage
- resistance
- capacitance
- amperage
17: A relief valve shall be located at least ___ above grade.
- 15'
- 25'
- 10'
- 36'
18: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
19: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 700F
- 1000F
- 600F
- 800F
20: A normal operating evaporator temperature of R-22 for air conditioning is typically
- 58F
- 32F
- 55F
- 45F
21: A halide torch is most useful with a freon compression system
- to sweat flanges on the refrigeration piping
- to remove from from TXV's and evaporator coils
- to detect refrigeration leaks in piping joints
- to release a sticking valve
22: What would be the classification of a church?
- Institutional
- Large mercantile
- Industrial
- Place of assembly
23: What type of oil is used in R-410A systems?
- polyolester (POE)
- naphthene
- polyalkylene glycol (PAG)
- mineral oil
24: A relief valve discharge capacity is rated in
- PSIA
- PSIG
- Pounds of air per minute.
- temperature minus pounds of air per second divided by release rate squared
25: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above