Topics: All categories in the pool
1: "E" represents _____ in the Watt's law formula.
- amperage
- voltage
- reactance
- watts
2: The low pressure oil safety switch
- must be reset manually
- resets itself after the time delay has terminated
- never trips
- resets itself automatically
3: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
4: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 2%
- 1%
- 25%
- 4%
5: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
6: How many flammability classifications are refrigerants in?
- 2
- 7
- 3
- 5
7: What type refrigerant is NOT ozone depleting?
- CFC
- HCFC
- HFC
- Halon
8: The gauge thickness required on a CO2 tank construction is
- 1/8"
- 5/16"
- 3/32"
- 1/16"
9: Which refrigerant class listed below is the most flammable?
- A-1
- A-3
- B-2
- C-3
10: How are safety controls wired in a circuit?
- Either series or parallel
- Series/parallel
- Series
- Parallel
11: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
12: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- self-closing doors
- tight fitting doors
- automatic ventilation
13: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the aggregate of the high side and low side
- 2.5 times the design pressure
- the low side
- the high side
14: What is the amp draw of a 40 VA transformer at 24 volts
- 1.6 amps
- 1K amps
- 106 amps
- 1,000 amps
15: What is the leaving chilled water set point for water chiller systems?
- 38F
- 45F
- 55F
- 66F
16: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- When mixed with R-718
- Yes, always
- No, never
17: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
18: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
19: All serviceable components of a refrigeration system shall be provided with
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- service manuals
- manufactures instructions on start-up procedures
- safe access
20: A high side float is a
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type valve that controls the amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
- float type switch that stops the compressor when the pressure on the high side becomes too high
21: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Pressure induced displacement.
- Positive displacement
- Low Pressure displacement
- Non-positive displacement
22: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
23: On a single phase motor, when does the start winding cut out?
- 25% of its RLA speed
- 50% of its RLA speed
- 75% of its RLA speed
- 100% of its RLA speed
24: A VRF system is a direct system
- true
- false
25: Gauge pressure is
- what a gauge reads when checking pressures on a chilled water system.
- absolute pressure
- force of pressure above that of atmospheric
- atmospheric pressure