Topics: All categories in the pool
1: 1 HP = ____ Watts?
- 746
- 3.1416
- 11,239
- 3,412
2: The main purpose of the accumulator is to
- provide space for the accumulation of oil and containminants
- provide space for vapor to accumulate
- prevent liquid slugs at the compressor
- store liquid refrigerant
3: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- T&P device
- Circuit Breaker
- Relief valve
4: A single pole-double throw switch uses how many wires?(excluding the ground)
- 2
- 5
- 4
- 3
5: The two float-type metering devices are the
- liquid float and the vapor float
- vapor float and the low-side float.
- high-side float and the low-side float
- liquid float and the low-side float
6: The best way to detect ammonia in brine is
- CO2 gas
- carbonation of soda
- nessler regaent
- potassium of line
7: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 158F
- 155F
- 45F
- 32F
8: Pressure relief valves shall be marked with the data from
- Section VIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
- Section XIII Division of the ASME Boiler & Pressure Code
9: How many refrigerant classifications are there for flammability?
- 7
- 1
- 2
- 3
10: 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
11: The absorber shell contains the
- evaporator and the absorber
- condenser and the absorber
- condenser, the evaporator, and the generator
- condenser and the generator
12: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 365 psig
- 255 psig
- 125 psig
- 327 psig
13: The principle used in continuous type absorption systems is
- Ohm's Law
- Dalton's Law
- Charles's Law
- Boyle's Law
14: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Latent heat
- Enthalpy
- Specific heat
- Sensible heat
15: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
16: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
17: 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
- Air and dirt
- Oil and water
18: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
- Because it's water
- Because it's a non-flammable refrigerant
19: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Simple
- Low pressure
- R-414B
- Cascade
20: RPM's of a centrifugal compressor are at approximately?
- 30,000
- 15,000
- 500
- 10,000
21: Three-phase motors have what type of windings?
- three run windings
- three start windings
- three run windings and 3 start windings
- one start winding and one run winding.
22: 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
23: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 1%
- 4%
- 2%
- 25%
24: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- king valves
- companion or block valves
- gate or globe valves
- ball valves
25: A 24 volt transformer with a 240 volt primary can handle how many amps?
- There isn't enough information to answer.
- 10 amps
- 24 amps
- 20 amps