Topics: All categories in the pool
1: A chiller entering and leaving temperature difference is?
- 5 degrees F
- 10 degrees F
- 20 degrees F
- 50 degrees F
2: Ammonia can come in contact with _______ ?
- Aluminum
- Copper tubing
- Brass
- Copper
3: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Dorms
- Football stadium
4: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
5: When an electronic bridge is in balance the bridge output will be
- 0 volts
- 1 volt
- .01 volts
- 15 volts
6: The instrument used to measure the specific gravity of absorption chiller solutions is the
- refractometer
- anemometer
- Psychrometer
- hydrometer
7: A start capacitor is wired in _____ with the start windings.
- series-parallel
- series
- junction
- parallel
8: One ton of refrigeration is defined as ______ btu/minute.
- 60
- 720,000
- 12,000
- 200
9: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and reciever
- between the compressor and oil separator
- between the compressor and the stop valve
10: A low oil switch is typically
- automatic reset
- non used on semi-hermetic compressors over 10 ton capacity
- manual reset
- time-delay auto reset
11: What must be done to refrigerant pipes before being buried?
- Certified
- Leaked checked
- Coated
- Encased
12: The solution that leaves the concentrator in an absorption chiller is referred to as the
- weak solution
- absorbed solution
- diluted solution
- strong solution
13: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
14: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
15: 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
16: How much refrigerant can be stored in a mechanical room outside of the system?
- 200
- 150
- 330
- 100
17: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
- shall use fusible plugs
18: A EPR valve is installed on what type of evaporators?
- high-temperature evaporators
- plate evaporators
- low-temperature evaporators
- shell and tube evaporators
19: A micron is
- one millonths of a centimeter
- one millonths of a micrometer
- one thousandths of a millimeter
- a larger unit of measurement than Hg
20: Foaming of oil in a compressor is most likely to occur
- when there is insufficient air across the condenser(i.e., dirty coil)
- when the evaporator temperatures are below 32F
- at start-up
- when ambient temperature are low
21: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- any decrease in pressure will cause condensation
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
22: A secondary coolant is defined as
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- any refrigerant direcly in contact with the cooling space for process cooling
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- a low temperature refrigerant used for cascading systems
23: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Cascade
- Simple
- R-414B
- Low pressure
24: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
25: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or more