Topics: All categories in the pool
1: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 500 lbs
- 55 lbs
- 660 lbs
2: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
3: How far from the window does a relief valve need to be according to ASHRAE-15?
- There is no minimum for relief valve and windows.
- At least 30'
- At least 20'
- At least 40'
4: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
5: What is used to check very low air pressures in air conditioning duct?
- Manometer
- Barometer
- Anemomter
- Vacuum gauge
6: Ammonia systems use ____ pressure to adjust oil pressure
- air
- discharge
- stream
- liquid
7: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- public assembly occupancy
- illegal occupancy
- commercial occupancy
- institutional occupancy
8: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
9: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 330
- 100
- 200
10: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- ball valves
- king valves
- gate or globe valves
11: Oils, classified as to source, are
- naphthalene, mixed, and paraffin
- animal, vegetable, and castor
- naphthalene, paraffin, and castor
- animal, vegetable, and mineral
12: How many gallons of water per pound of ammonia do you need?
- 20
- 5
- 1
- 15
13: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
14: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 700F
- 1000F
- 800F
- 600F
15: The Board of Boilers adopts by reference
- the MACS Pressure Vessel Code of Massachusetts
- Montreal Protocol Safety Code
- MSCA Code
- the 1997 ANSI/ASHRAE Safety Code
16: B3 refrigerants are considered
- non-toxic but non-flammable
- non-toxic but flammable
- toxic but non-flammable
- toxic and highly flammable
17: Volts x amps equals
- Ohms Law
- Watts
- Inductance
- Impedance
18: What refrigerant doesn't have to be classified?
- R-717
- R-718
- R-422A
- R-134A
19: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
- CFM and RPM decrease
- CFM and HP decrease
- RPM and CFM increase
- CFM and HP increase
20: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe plus equivalent-length of fittings
21: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
22: While the system is operating, the discharge line should be
- room temperature
- at the same temperature as the crankcase
- too hot to hold by hand
- 10-15F warmer than ambient
23: A VRF system is a direct system
- true
- false
24: Before replacing a seized compressor, the _______ should be determinded.
- cause of seizure
- current draw
- designed head pressure
- type of refrigerant
25: What are the three components of a transformer?
- Primary coil, secondary coil, and core
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
- Primary core, secondary coil, and high and low voltage connectors.