Topics: All categories in the pool
1: If the power element on an expansion valve should lose its charge, the valve would
- Stay open
- Under feed
- Close
- Over feed
2: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 13.9 lbs
- 6.6 lbs
- 44 lbs
3: The absorber shell contains the
- condenser and the absorber
- evaporator and the absorber
- condenser, the evaporator, and the generator
- condenser and the generator
4: The low pressure oil safety switch
- never trips
- resets itself automatically
- must be reset manually
- resets itself after the time delay has terminated
5: All low-pressure chillers use which type of compressor?
- Reciprocating
- Centrifugal
- Rotary
- Scroll
6: What is used to check very low pressure?
- Velometer
- Hygrometer
- Manometer
- Hydrometer
7: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.25'
- 8'4"
- 7.00'
- 9.00'
8: The two basic types of evaporators are
- direct expansion and plate
- finned and plate
- prime surface and finned
- flooded and direct expansion
9: Sensible heat is the heat added to a substance to
- cause evaporation
- raise its temperature
- change its state
- freeze it
10: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with ammonia
- Flush with R-718
- Flush with R-11
- Flush with RX-11
11: Pipe identification labels are required when the system contains more than
- 110 lbs
- 55 lbs
- 120 lbs
- 65 lbs
12: Pressure relief valves shall be marked with the data from
- Section IV Division of the ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
- Section XIII Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
13: RPM's of a centrifugal compressor are at approximately?
- 30,000
- 500
- 15,000
- 10,000
14: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When its white
- When there is a space 6' or more above it
- When it's used as part of a supply or return air system
15: Capacity control on a centrifugal compressor is accomplished by the
- post-rotational guide vanes
- pre-rotational guide vanes
- check valves
- slide vanes
16: Name a reason that does not cause reduced condenser air quantity
- Prevailing winds
- High ambient temperature
- Dirty Coil
- Dirty fan blades
17: The leaving chilled water set point for comfort cooling is typically?
- 60
- 45
- 38
- 66
18: All electrical work done on refrigeration systems must comply with
- Department of Energy
- ASHREA-15 Section 9.2.1
- OSHA
- NEC and Massachusetts Modifications
19: What is the typical air conditioning operating pressures for R-22?
- 60 psi suction 210 psi discharge
- 25 psi suction 125 psi discharge
- 105 psi suction 340 psi discharge
- None of the above
20: 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 copper contacts
- Primary coil, secondary coil, and core
21: When the compressor is below the condensor
- traps are needed on the oil return line
- traps are needed on the discharge line
- traps are not needed on this type of system
- traps are needed on the suction line
22: Which creates more of a heat load?
- 90% RH
- 30% RH
- 70% RH
- 50% RH
23: Most CFC's are
- inert but toxic
- flammable
- toxic
- inert
24: 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
- load-side of the contactor in
- breaker panel in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
25: How far from the ground does a relief valve need to be?
- At least 25' above grade
- At least 20' above grade
- At least 15' above grade
- Not more than 3' above grade