Topics: All categories in the pool
1: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
2: 746 watts is equal to
- Pi
- 1 hp
- 10 hp
- 100 hp
3: Gauge pressure is
- Barometric pressure
- Atmospheric pressure
- Force of pressure above that of atmosphere
- Absolute pressrue
4: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
5: What refrigerant doesn't have to be classified?
- R-717
- R-718
- R-134A
- R-422A
6: 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
7: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
8: R-11 belongs to Group
- B-3
- B-1
- A-2
- A-1
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.
- “UL”
- “U” or “UM”
- “UM” and “UV”
- “UV”
10: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
11: What measures gas pressure?
- Hygrometer
- Manometer
- Barometer
- Hydrometer
12: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
13: What does safe access mean?
- OSHA approved
- Well-lit exit signs
- Locked doors
- A clear unobstructed path to the equipment and controls
14: What is R-611’s ASHRAE Safety Code?
- B3
- B2
- C3
- A2
15: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 75%
- 90%
- 99%
- 80%
16: A EPR valve is installed on what type of evaporators?
- plate evaporators
- shell and tube evaporators
- low-temperature evaporators
- high-temperature evaporators
17: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
18: Where a refrigeration or air conditioning system is installed,
- the form or certificate shall be authorized by the Department of Public Safety
- A field inspection shall be made before it is put into service
- The company who installed the system must notify the fire department in the jurisdiction where installed
- it shall not be operated below prescribed pressuers
19: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
20: Usually dry bulb temperature is
- not important and shall be ignored
- higher than wet bulb temperature
- same as wet bulb temperature
- lower than dry bulb temperature
21: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
22: At higher altitudes, boiling temperatures
- increase
- decrease
- depends on the refrigerant
- are unaffected
23: Ammonia can come in contact with _______ ?
- Copper
- Copper tubing
- Aluminum
- Brass
24: It takes how many BTU/hr to melt one pound of ice at 32F
- 212
- 144
- 970
- 180
25: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- yes
- no
- yes, for systems under 10 tons