Topics: All categories in the pool
1: Capacity control on an absorption system is typically accomplished by varying the
- rate at which heat is supplied to the generator
- speed of the chilled water circulatory pump
- pressure setting on the system's rupture disc
- speed of the condenser water circulator pump
2: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
3: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 100%
- 90%
- 80%
4: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 15
- 10
- 24
5: When a refrigeration or air conditioning system is installed
- it shall not be operated below prescribed pressures
- the form of certificate shall be authorized by the Department of Pubic safety
- a field inspection shall be made before it is put into service
- it shall be approved by the owner for proper operation.
6: In a system designed for sub-zero ambient temperatures, what must be added?
- Nitrogen
- Booster compressor
- Low-ambient kit
- Infrared dye for leak identification
7: What is the minimum size wire you can use on a 30 amp circuit?
- 14 AWG
- 12 AWG
- 10 AWG
- 16 AWG
8: The measurement of heat in a particular substance is
- latent heat
- specific heat
- enthalpy
- sensible heat
9: What would be the classification of a prison?
- Industrial
- Institutional
- Place of assembly
- Large mercantile
10: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak from a failed connection or component of such system
11: Gauge pressure is
- atmospheric pressure
- force of pressure above that of atmospheric
- absolute pressure
- what a gauge reads when checking pressures on a chilled water system.
12: What do you need to do when you install a new system?
- Insulate the suction line before you take a superheat reading
- Add refrigerant
- Have it inspected
- Document the superheat and subcooling reading
13: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Flanged and gasketed
- Welded and seamed.
- Ducted and sealed
14: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- CPR valve
- EPR valve
- EEV
- Solenoid valve
15: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 9F
- 29F
- 11F
- 21F
16: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 120v
- 240v
- 277v
- 208v
17: When should a relief valve start to function?
- 10 psi before it's set pressure
- Two times it's working pressure
- Before the purge station discharges
- At it's set pressure
18: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
19: 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
20: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
21: The proper location for an oil separator is between the
- compressor and condenser
- condenser and receiver
- receiver and metering device
- evaporator and compressor
22: The leaving chilled water set point for comfort cooling is typically?
- 38
- 66
- 60
- 45
23: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
24: "E" references ____ in the Ohm's law formula
- resistance
- voltage
- amperage
- capacitance
25: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use rupture discs or duel pressure relief valves