Topics: All categories in the pool
1: An example of an "Expendable Refrigerant" is
- liquid oxygen
- liquid nitrogen
- lithium bromide
- ammonia
2: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 40% Li-Br, 60% distilled water
- 40% Li-Br, 60% tap water
- 60% Li-Br, 40% distilled water
- 50% Li-Br, 50% tap water
3: What is considered a cooling agent?
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat when condensation occur
4: How is bring measured?
- manometer
- anemometer
- hydrometer
- hygrometer
5: A relief valve shall be located at least ___ above grade.
- 36'
- 10'
- 25'
- 15'
6: The reversing valve is commonly used
- on multiple compressor systems
- on all heat pumps
- when the code requires a check valve
- on commercial system that involve two different temperatures
7: Where is an EPR valve located on a multi-evaporator system?
- Suction line at the compressor
- Suction line of the coolest evaporator
- Suction line prior to the accumulator of the lowest temperature system
- Suction line of the warmest evaporator
8: Sensible heat is the heat added to a substance to
- cause evaporation
- change its state
- raise its temperature
- freeze it
9: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 330 lbs
- 660 lbs
- 55 lbs
10: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 50
- 15
- 75
- 55
11: A run capacitor is wired in series with the _____ windings.
- common
- start capacitor
- run
- start
12: B3 refrigerants are considered
- non-toxic but non-flammable
- toxic and highly flammable
- toxic but non-flammable
- non-toxic but flammable
13: A EPR valve is installed on what type of evaporators?
- shell and tube evaporators
- low-temperature evaporators
- high-temperature evaporators
- plate evaporators
14: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
15: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is a system highly likely to leak from a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
16: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
- Ducted and sealed
17: 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
- 70F
- 58F
- 77F
18: Volts x amps equals
- Impedance
- Inductance
- Watts
- Ohms Law
19: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Copper
- Magnesium alloy
- Aluminum
20: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- one ton of cooling
- two tons of cooling
- three tons of cooling
21: "E" represents _____ in the Watt's law formula.
- voltage
- reactance
- watts
- amperage
22: What is R-22?
- HFC
- Chlorofluoromethane
- Chlorodifluoromethane
- CCFCM
23: 1 HP = ____ Watts?
- 3.1416
- 3,412
- 11,239
- 746
24: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
25: Stop valves shall not be permitted between the system and the
- relief valve
- bleed valve
- service valve
- condenser