Topics: All categories in the pool
1: What does safe access mean?
- A clear unobstructed path to the equipment and controls
- Locked doors
- Well-lit exit signs
- OSHA approved
2: Total heat of a substance is considered
- specific heat
- enthalpy
- sensible heat
- empathetical
3: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the outdoors
- the return air ducted system
- the mechanical room housing the refrigeration system
- Machinery rooms need not be vented
4: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Fan-like action
- Suction and discharge valves
- Rotating vanes
- Nesting scrolls
5: A halide torch is most useful with a freon compression system
- to detect refrigeration leaks in piping joints
- to release a sticking valve
- to sweat flanges on the refrigeration piping
- to remove from from TXV's and evaporator coils
6: Increasing superheat will do what to your frost line?
- Decrease
- Nothing
- Increasae
- Could either increase or decrease depending on the load conditions
7: How many gallons of water do you need per pound of ammonia?
- 100
- 10
- 1
- 50
8: A start capacitor in series with a start winding will
- decrease the amp draw of the motor
- increase running efficiency
- increase the amp draw of the motor
- increase starting torque
9: Copper and its alloys shall not be used with ammonia
- True
- False
10: How many different groups of refrigerants are there?
- 11
- 3
- 15
- 7
11: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 1%
- 4%
- 2%
- 25%
12: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 550 lbs
- 330 lbs.
- 660 lbs
13: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- public assembly occupancy
- institutional occupancy
- mixed occupancy
14: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- design pressure
- critical pressure
- low pressure
15: What type of pressure relief device is used on a CO2 system?
- Rupture disk
- Gate valve
- Fusible plug
- Glove valve
16: Which of the following is not an air velocity meter?
- Velometer
- Anemometer
- Anemotherm
- Hydrometer
17: How would you know if there was a loss of crankcase pressure?
- oil level will rise
- oil will thicken
- oil will foam
- oil will thin out
18: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or less
19: Pressure relief valves shall be marked with the data from
- Section XIII Division of the ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
20: What device should be used on low-temperature freezers?
- discharge muffler
- high capacity TXV
- oil separator
- hot-gas by-pass
21: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 24
- 18
- 10
- 15
22: While the system is operating, the discharge line should be
- at the same temperature as the crankcase
- room temperature
- too hot to hold by hand
- 10-15F warmer than ambient
23: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- the same
- there is no Group B1 refrigerants
- lower
- higher
24: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UV or UR
- UM or UL
- UL and UM
25: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above