Topics: All categories in the pool
1: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- gas masks must be worn
- no flames shall be permitted
- the owner shall be informed
- explosion precautions must be taken
2: All electrical work done on refrigeration systems must comply with
- Department of Energy
- ASHREA-15 Section 9.2.1
- OSHA
- NEC and Massachusetts Modifications
3: Which refrigerant class listed below is the most flammable?
- A-1
- A-3
- C-3
- B-2
4: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 9F
- 21F
- 29F
- 11F
5: No open flames are allowed in the machinery room unless?
- Never can be allowed
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
- Approved by the installing contractor
6: 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
7: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
8: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 1%
- 4%
- 2%
- 25%
9: A chiller entering and leaving temperature difference is?
- 20 degrees F
- 10 degrees F
- 50 degrees F
- 5 degrees F
10: 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
11: A hotel is considered a _______ occupancy.
- commercial
- residential
- institutional
- mercantile
12: R-11 belongs to Group
- B-1
- B-3
- A-1
- A-2
13: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 970 BTU
- 24,000 BTU
- 144 BTU
- 12,000 BTU
14: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
15: At higher altitudes, the boiling point of refrigerant is
- equal to the coefficient of water at 32F
- the same
- lower
- higher
16: Ammonia is under what safety classification?
- B3
- A3
- B2
- B1
17: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 350
- 550
- 50
18: Capacitors are rated in
- micro-farads
- kelvins
- volt - amperes
- megaohms
19: 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.
20: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- critical pressure
- design pressure
- low pressure
21: What device measures the specific gravity of a substance?
- Hygrometer
- Manometer
- Thermometer
- Hydrometer
22: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 100
- 350
- 250
- 400
23: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
- 257 psig, 77 psig
- 350 psig, 120 psig
- 455 psig, 185 psig
- 226 psig, 68 psig
24: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the warmest evaporator
- Suction line of the coolest evaporator
- Suction line at the compressor
- Suction line prior to the accumulator of the lowest temperature system
25: Ammonia vaporization takes place at what temperature?
- -110F
- -28F
- -460F
- -32F