Topics: All categories in the pool
1: Pipe identification labels are required when the system contains more than
- 110 lbs
- 65 lbs
- 55 lbs
- 120 lbs
2: A run capacitor is wired in series with the _____ windings.
- run
- common
- start capacitor
- start
3: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- start the comrpessor
- start the fan and circulating pump
- reset the expansion valve
- reset the safety valve
4: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- run voltage
- boost voltage
- pick up voltage
- lift voltage
5: Relief valves are rated in
- gallons of water per hour
- pounds of air per hour
- gallons of water per minute
- pounds of air per minute
6: Color is important in oil because
- can tell us something about the refining of oil
- it makes sight glasses easy to read
- it indicates the viscoisty.
- allows you to see into crankcase
7: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 10
- 20
- 15
- 25
8: A mercury bulb controller is not recommended for
- line or low voltage use
- low voltage use
- line voltage use
- use where vibration is severe
9: Total heat of a substance is considered
- sensible heat
- empathetical
- enthalpy
- specific heat
10: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- Pumpdown procedures are not allowed with systems containing liquid recievers
- release the charge when the pressure exceeds 310 psig or higher
- receive the pumpdown charge
- hold up to 110% of the pumpdown charge
11: How many BTU's is produced by one watt of energy
- 1
- 3.00
- 2.57
- 3.41
12: 746 watts is equal to
- Pi
- 10 hp
- 1 hp
- 100 hp
13: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
14: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- quarterly
- bi-annually
- annually
- regularly
15: 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.
- “U” or “UM”
- “UL”
- “UV”
- “UM” and “UV”
16: A positive displacement compressor is
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
17: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 12,000 BTU
- 144 BTU
- 970 BTU
- 24,000 BTU
18: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
- Notify the Fire Marshal that the system has been inspected and approved
- Notify the AHJ to let them know that the system been inspected
19: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 80%
- 100%
- 90%
- 75%
20: How many gallons of water per pound of ammonia do you need?
- 1
- 20
- 5
- 15
21: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- automatic ventilation
- self-closing doors
- tight fitting doors
22: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
23: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
24: A declaration test is needed when the system contains more than
- 55 lbs
- 110 lbs
- 65 lbs
- 120 lbs
25: R-22 is considered a(n)
- HCFCH
- HCFC
- CFC
- HFC