Topics: All categories in the pool
1: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 365 psig
- 255 psig
- 125 psig
- 327 psig
2: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- phosgene gas sening
- A group sensing
- CO Sensing
3: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 75%
- 80%
- 90%
4: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- critical pressure
- high pressure
5: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three run windings and 3 start windings
- three run windings
- three start windings
6: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Dorms
- Football stadium
7: The Board of Boilers adopts by reference
- the MACS Pressure Vessel Code of Massachusetts
- MSCA Code
- the 1997 ANSI/ASHRAE Safety Code
- Montreal Protocol Safety Code
8: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- 2.5
- 1250
- There isn't enough information to answer.
- 2
9: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
10: What is R-22?
- Chlorofluoromethane
- CCFCM
- Chlorodifluoromethane
- HFC
11: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
12: R-123 belongs to Group
- B-1
- B-2
- B-3
- A-3
13: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
14: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
15: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
16: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe as you would measure it
17: The principle used in continuous type absorption systems is
- Charles's Law
- Boyle's Law
- Ohm's Law
- Dalton's Law
18: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- splurge
- surge
- merge
- purge
19: Which occupancy can ammonia be used in?
- industrial
- commercial
- redifential
- depends on the quantity of freon
20: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- compressor
- boiler
- outside the machinery room
- evaporator
21: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
22: What refrigerant doesn't have to be classified?
- R-422A
- R-717
- R-134A
- R-718
23: How many different groups of refrigerants are there?
- 7
- 3
- 15
- 11
24: How far from the ground does a relief valve need to be?
- At least 25' above grade
- At least 15' above grade
- At least 20' above grade
- Not more than 3' above grade
25: The first step in mechanical refrigeration is
- compression
- condensation
- expansion
- evaporation