Topics: All categories in the pool
1: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 100,000
- 100
- 10,000
2: Suction line oil traps should be installed when the condenser is
- located outside the operates in temperatures below 35F
- on the third floor roof and the evaporator is in the basement
- in the basement and the evaporator is on the third floor
- more than 100' away from the evaporator
3: "E" references ____ in the Ohm's law formula
- amperage
- voltage
- resistance
- capacitance
4: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UM
- UV or UR
- UM or UL
- UL and UR
5: What is an example of institutional occupancy?
- Football stadium
- Shopping mall
- Dorms
- Hospital
6: 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?
- RPM and CFM increase
- CFM and RPM decrease
- CFM and HP increase
- CFM and HP decrease
7: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
8: Crankcase heaters are energized
- when the compressor is off
- to allow easy compressor start-up
- to prevent compressor freeze-up
- while the compressor is running
9: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
10: Ammonia (NH3) is a group III refrigerant
- True
- False
11: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
12: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
13: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- high side of the system
- the vapor side of the system
- low side of the system
- the liquid side of the system
14: The outer portion of shell of the compressor used on low-pressure chillers is called the
- volute
- suction
- nozzle
- baffle
15: A micron is
- one thousandths of a millimeter
- one millonths of a centimeter
- a larger unit of measurement than Hg
- one millonths of a micrometer
16: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.0
- 2.5
- 3.0
- 5.5
17: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
18: An example of an "Expendable Refrigerant" is
- liquid oxygen
- liquid nitrogen
- ammonia
- lithium bromide
19: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 158F
- 32F
- 155F
- 45F
20: 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 40'
- At least 30'
- At least 20'
21: NH3 is
- R-508A
- ammonia
- lithium bromide
- R-718
22: 1 Watt = ______ BTU's?
- 12
- 4.482
- 7.216
- 3.412
23: The low pressure oil safety switch
- never trips
- resets itself automatically
- resets itself after the time delay has terminated
- must be reset manually
24: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 10
- 25
- 15
25: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- EPR valve
- CPR valve
- EEV
- Solenoid valve