Topics: All categories in the pool
1: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
2: When using nitrogen for brazing, the pressure should be:
- Slightly below atmospheric
- 125 psig
- Very low
- 50-100 psig
3: All serviceable components of a refrigeration system shall be provided with
- service manuals
- safe access
- manufactures instructions on start-up procedures
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
4: When energized, a normally open relay will be
- noisy
- open
- closed
- depends on the type and class of the relay
5: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- rupture plug
- relief plug
- fusion plug
- fusible plug
6: The most common type of motor starter is
- duel-winding starter
- delts-wye starter
- across the line starter
- part winding starter
7: Color is important in oil because
- it indicates the viscoisty.
- it makes sight glasses easy to read
- can tell us something about the refining of oil
- allows you to see into crankcase
8: What is a Category "D" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
9: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 6.6 lbs
- 13.9 lbs
- 22 lbs
- 44 lbs
10: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 550 lbs
- 660 lbs
- 330 lbs.
- 55 lbs
11: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three start windings
- three run windings and 3 start windings
- three run windings
12: What is R-22?
- Chlorofluoromethane
- HFC
- CCFCM
- Chlorodifluoromethane
13: What is the purpose of a surge capacitor on a contactor?
- to provide smoother start/stops
- to balance the sine waves
- to keep the contactor pulled in
- to protect low voltage equipment
14: The reversing valve is commonly used
- when the code requires a check valve
- on commercial system that involve two different temperatures
- on multiple compressor systems
- on all heat pumps
15: A micron is
- one millonths of a micrometer
- one thousandths of a millimeter
- a larger unit of measurement than Hg
- one millonths of a centimeter
16: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
17: If the power element of an expansion valve should lose its charge the valve would
- go open
- go closed
- underfeed the evaporator
- overfeed the evaporator
18: The generator shell contains the
- evaporator and the absorber
- condenser, the evaporator, and the generator
- condenser and the absorber
- condenser and the generator
19: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
20: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- the mechanical room housing the refrigeration system
- Machinery rooms need not be vented
- the outdoors
21: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
22: Machinery rooms must be vented to ______?
- outdoors
- neutralizing tank
- basement
- unoccupied spaces
23: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 20
- 15
- 10
- 25
24: Industrial occupancy is
- a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
- is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- Both a and b are correct
25: Low pressure chiller systems use what type of compressor?
- Reciprocating
- Centrifugal
- Screw
- Scroll