Topics: All categories in the pool
1: The difference between saturated liquid and saturated vapor is
- pressure
- heat
- temperature
- volume
2: R-22 falls under which safety classification?
- A-1
- B-2
- A-2
- B-1
3: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 155F
- 32F
- 158F
- 45F
4: Large mercantile occupancy is
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
5: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
6: Foaming of oil in a compressor is most likely to occur
- when the evaporator temperatures are below 32F
- at start-up
- when ambient temperature are low
- when there is insufficient air across the condenser(i.e., dirty coil)
7: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and oil separator
- between the compressor and the stop valve
- between the compressor and reciever
8: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's a non-flammable refrigerant
- Because it's water
9: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 55 lbs
- 550 lbs
- 330 lbs.
10: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 50
- 75
- 24
- 100
11: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Nickel
- Zinc
- Magnesium
12: How many square inches per square foot?
- 144
- 64
- 98
- 24
13: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- specific heat
- lost heat
- latent heat
- sensible heat
14: 1 Watt = ______ BTU's?
- 3.412
- 7.216
- 4.482
- 12
15: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 2.2
- 1.2
- 1
- 1.5
16: What is the voltage of each leg of a 480 Volt three-phase motor?
- 240v
- 208v
- 120v
- 277v
17: What is not a requirement of a Class T machine room?
- Automatic ventilation
- Self-closing doors
- Fire hose connected to the building fire protection system.
- Tight fitting doors
18: When must refrigeration system covered by the code be inspected?
- Not required
- Annually and when installed
- Upon installation
- Annually
19: What type of material can't be used on the outlet of a relief valve?
- Stainless steel
- Magnesium alloy
- PVC
- Copper
20: What is an example of institutional occupancy?
- Hospital
- Dorms
- Shopping mall
- Football stadium
21: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
22: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- opening at the pump inlet
- opening at the pump outlet
- cooling temperature set-point
- adjustment of the spring tension of the TXV
23: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
- upper chamber of the low side
24: The Board of Boilers adopts by reference
- the MACS Pressure Vessel Code of Massachusetts
- the 1997 ANSI/ASHRAE Safety Code
- Montreal Protocol Safety Code
- MSCA Code
25: On a single phase motor, when does the start winding cut out?
- At 75% of its full rated speed
- At 50% of its full rated speed
- At 25% of its full rated speed
- Start windings do no cut-out of the run cycle