Topics: All categories in the pool
1: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 24
- 15
- 10
2: 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
3: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 1
- 3
- 2
4: What is the amp draw of a 40 VA transformer at 24 volts
- 106 amps
- 1K amps
- 1,000 amps
- 1.6 amps
5: Low-side system leaks in a low-pressure chiller will often result in
- water being pulled into the system
- air being pulled into the system
- nitrogen leaking out of the system.
- system refrigerant leaking from the system
6: On a large centrifugal system, what meters the flow to the evaporator?
- TXV
- Low side float
- High side float
- Cap tube.
7: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
8: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
- negative displacement compressor
- non-volumetric displacement compressor
- neutral chamber-type compressor
- non-positive displacement compressor
9: When should a relief valve start to function?
- 10 psi before it's set pressure
- Before the purge station discharges
- Two times it's working pressure
- At it's set pressure
10: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 6.6 lbs
- 44 lbs
- 13.9 lbs
- 22 lbs
11: Ammonia vaporization takes place at what temperature?
- -28F
- -32F
- -110F
- -460F
12: When the compressor is below the condensor
- traps are not needed on this type of system
- traps are needed on the discharge line
- traps are needed on the suction line
- traps are needed on the oil return line
13: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
14: 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
15: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
16: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 80%
- 75%
- 90%
17: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
18: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 8'4"
- 7.00'
- 7.25'
- 9.00'
19: What section governs pressure vessels?
- Section 1 ASHREA 15 ASME fired
- Section 8 ASHREA 15 ASME unfired
- OSHA
- Section ASHREA 34
20: 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.
- 100
- 24
- 50
- 75
21: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
- over pressure protection
22: The certificate of inspection
- shall be posted and protected from dirt, water, and other elements
- shall be authorized by a notarized insurance company
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted on the compressor shell or electrical panel at the unit
23: Low pressure systems have what kind of compressor?
- Scroll
- Rotary
- Centrifugal
- Reciprocating
24: Direct systems using Group II refrigerants
- shall be installed per instruction of the AHJ
- shall be allowed to be used for human comfort.
- shall not be used for air condition for human comfort
- shall be installed in Class T machinery rooms
25: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.