Topics: All categories in the pool
1: Which refrigerant replaced R-12?
- R-410A
- R-134A
- R-407A
- R-22
2: All serviceable components of a refrigeration system shall be provided with
- safe access
- manufactures instructions on start-up procedures
- service manuals
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
3: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- mercantile occupancy
- business occupancy
- public assembly occupancy.
- commercial occupancy
4: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 66
- 25
- 22
5: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
6: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
7: Volts x amps equals
- Watts
- Ohms Law
- Inductance
- Impedance
8: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- B-1
- A-2
9: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
10: What would be the classification of a prison?
- Large mercantile
- Place of assembly
- Industrial
- Institutional
11: A trap on the suction line would be needed if
- the system is considered a low-pressure system according to ASHREA
- AHJ requires it
- the evaporator is in the basement, condenser is on the third floor.
- the evaporator is on the third floor, condenser on the first floor.
12: When an electronic bridge is in balance the bridge output will be
- 0 volts
- .01 volts
- 1 volt
- 15 volts
13: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 6.6 lbs
- 13.9 lbs
- 44 lbs
14: What is the state of the refrigerant leaving the evaporator?
- a low temperature subcooled liquid
- a high temperature subcooled liquid
- a high temperature superheated vapor
- low temperature superheated vapor
15: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Water and soap
- Moisture and air
- Oil and water
- Air and dirt
16: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- sensible heat
- specific heat
- lost heat
- latent heat
17: R-11 belongs to Group
- B-1
- A-1
- A-2
- B-3
18: A Lithium-bromide system is an absorption system that
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
- uses salts as an absorbent and lithium bromide as a refrigerant
19: Gauge pressure is
- Barometric pressure
- Absolute pressrue
- Force of pressure above that of atmosphere
- Atmospheric pressure
20: "E" represents _____ in the Watt's law formula.
- reactance
- watts
- voltage
- amperage
21: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use pressure relief devices
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
22: The low pressure oil safety switch
- never trips
- resets itself after the time delay has terminated
- must be reset manually
- resets itself automatically
23: A chiller entering and leaving temperature difference is?
- 10 degrees F
- 5 degrees F
- 20 degrees F
- 50 degrees F
24: Megaohm meters can detect a ground in the
- up to 10,000 ohms
- 10,000,000 ohms or higher
- up to 1,000 ohms
- up to 1,000,000 ohms
25: Suction line oil traps should be installed when the condenser is
- more than 100' away from the evaporator
- on the third floor roof and the evaporator is in the basement
- in the basement and the evaporator is on the third floor
- located outside the operates in temperatures below 35F