Topics: All categories in the pool
1: Electricity involves the movement of electrons in atoms
- True
- False
2: Secondary refrigerants are usually
- alcohol
- Prestone anti-freeze
- water or brine
- expensive
3: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
4: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
5: Single compound Refrigerants are classified by what two criteria?
- Flammability and toxicity
- Flammability and temperature range
- Weight and color
- Temperature range and hazardousness
6: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusion plug
- rupture plug
- relief plug
- fusible plug
7: The certificate of inspection
- shall be authorized by a notarized insurance company
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
8: R-12 is
- dichlorodifluoromethane
- dichloromethane
- trichlorofluoromethane
- dichlorofluoromethane
9: Two systems using separate refrigerants that are superimposed upon one another is called
- cascade
- single stage
- booster
- indirect
10: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
11: What happens after your initial inspection of a pressure vessel?
- 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
- Notify the AHJ to let them know that the system been inspected
12: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- Pumpdown procedures are not allowed with systems containing liquid recievers
- release the charge when the pressure exceeds 310 psig or higher
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
13: Most CFC's are
- inert but toxic
- toxic
- flammable
- inert
14: Pi equals approximately
- 3.41
- 3.14
- 12,000
- 746
15: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- 24 volt secondary side of the Class 2 transformer to the thermostat
- load-side of the contactor in
- breaker panel in
- first disconnect in
16: Dew point is
- the temperature below which water vapor in the air will start to evaporate
- the temperature above which water vapor in the air will start to condense
- the temperature of air of 50% RH
- the temperature below which water vapor in the air will start to condense
17: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
18: Humidity can be sensed with
- human hair
- bimetal
- pressure bellows
- thermometer
19: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
20: Who is permitted to access a refrigeration machine room?
- Contractors only
- Authorized persons only
- Any employee
- Anyone, it's a completely safe area
21: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Enthalpy
- Latent heat
- Sensible heat
- Specific heat
22: Cooling tower lowers condenser water temp by
- condensation
- evaporative cooling
- running water thru a secondary heat exchanger
- running fans at 100%
23: A single pole-double throw switch uses how many wires?(excluding the ground)
- 4
- 2
- 3
- 5
24: The most common type of motor starter is
- part winding starter
- delts-wye starter
- duel-winding starter
- across the line starter
25: On cooling towers, what causes the condenser water to drop
- sensible heat
- evaporation of the water droplets
- tower fans
- ambient temperatures