Topics: All categories in the pool
1: The gauge thickness required on a CO2 tank construction is
- 1/16"
- 3/32"
- 1/8"
- 5/16"
2: By using nitrogen within a pipe during brazing operation,
- Copper oxide formation is prevented
- The explosion hazard is confined
- Exterior scale formation is minimized
- Discoloration is prevented
3: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
4: Start to Run windings will have what resistance?
- The most resistance value
- Somewhere between the actual start winding and run winding resistance value
- All will be at equal values
- The least resistance value
5: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- sight glass, weight, pressure, and dipstick
- sight glass, weight, pressure, and frost line
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, paper method, and frost line.
6: Where a refrigeration or air conditioning system is installed,
- A field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressuers
- The company who installed the system must notify the fire department in the jurisdiction where installed
- the form or certificate shall be authorized by the Department of Public Safety
7: Usually dry bulb temperature is
- same as wet bulb temperature
- lower than dry bulb temperature
- not important and shall be ignored
- higher than wet bulb temperature
8: What are the three components of a transformer?
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
9: Increasing superheat will do what to your system?
- Increase liquid flow
- Increase gas flow
- Decrease liquid flow
- Nothing
10: Electricity involves the movement of electrons in atoms
- True
- False
11: Where is the high-side float located on a chiller system?
- inside the chiller barrel
- flash line
- discharge line
- liquid line
12: A direct system
- is a self-contained complete factory made and tested system
- is on where brine is cooled & circulated to the space refrigerated
- is where the refrigerant comes in contact with the space refrigerated
- is one which encloses a separate body of evaporative refrigerant
13: What happens after your initial inspection of a pressure vessel?
- Notify the AHJ to let them know that the system been inspected
- Notify the Fire Marshal that the system has been inspected and approved
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
14: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
15: A restaurant is classified as a
- public assembly occupancy
- commercial occupancy
- mixed occupancy
- large mercantile occupancy
16: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
17: Pressure is the equivalent of
- force per unit area
- force
- force times area
- area times force
18: The density of a gas refers to
- cubic feet per pound
- pounds per square foot
- pounds per cubic foot
- pounds per absolute pressure
19: Color is important in oil because
- it indicates the viscoisty.
- can tell us something about the refining of oil
- it makes sight glasses easy to read
- allows you to see into crankcase
20: A water regulating valve opens when
- the compressor is on
- when the power is on
- the head pressure rises
- when the power is on there is an overcharge of refrigerant
21: What is the state of the refrigerant leaving the evaporator?
- low temperature superheated vapor
- a low temperature subcooled liquid
- a high temperature subcooled liquid
- a high temperature superheated vapor
22: What is an egress?
- An escape route
- A code violation
- A valve put on the low side of the system to prevent frosting
- An entrance or exit
23: Low pressure chiller systems use what type of compressor?
- Scroll
- Reciprocating
- Screw
- Centrifugal
24: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 32F
- 58F
- 70F
- 77F
25: When energized, a normally open relay will be
- open
- depends on the type and class of the relay
- noisy
- closed