Topics: All categories in the pool
1: What type of relief valve is used on a CO2 system?
- glove disc
- fusible plug
- rupture disc
- gate valve
2: 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
3: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 55 lbs
- 660 lbs
- 500 lbs
4: 1 HP = ____ Watts?
- 3,412
- 746
- 11,239
- 3.1416
5: 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
6: Copper and its alloys shall not be used with ammonia
- True
- False
7: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the high side
- lower chamber of the low side
- upper chamber of the low side
- lower chamber of the high side
8: What must be done to refrigerant pipes before being buried?
- Certified
- Leaked checked
- Encased
- Coated
9: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
10: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Magnesium
- Copper
- Zinc
- Nickel
11: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 24
- 15
- 10
12: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
13: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- a ling psychrometer doesn't have two theremometers.
- far apart or greater difference
- nearly the same
- 2F difference
14: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 9.776 watts
- .9776 watts
- 977.6 watts
- 9,776 watts
15: "I" represents ____ in the Ohm's law formula.
- resistance
- amperage
- capacitance
- voltage.
16: On a single phase motor, when does the start winding cut out?
- 75% of its RLA speed
- 50% of its RLA speed
- 100% of its RLA speed
- 25% of its RLA speed
17: A low oil switch is typically
- automatic reset
- manual reset
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
18: In a horizontal shell & tube condenser, the ammonia is liquefied by
- removing the latent heat of vaporization
- removing the latent heat of fusion
- passing thru the tubes from top to bottom
- water sprayed over condenser
19: The outer portion of shell of the compressor used on low-pressure chillers is called the
- baffle
- volute
- nozzle
- suction
20: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Rotating vanes
- Fan-like action
- Suction and discharge valves
- Nesting scrolls
21: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
22: Liquid line filter-driers on a 410A system must be rated for no less than
- 400 psig
- 1000 psig
- 200 psig
- 600 psig
23: What would be the classification of a prison?
- Institutional
- Place of assembly
- Large mercantile
- Industrial
24: Gauge pressure is
- force of pressure above that of atmospheric
- absolute pressure
- atmospheric pressure
- what a gauge reads when checking pressures on a chilled water system.
25: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 3 cubic feet or less
- 3 cubic feet or more
- 15 cubic feet or more