Topics: All categories in the pool
1: Ammonia is under what safety classification?
- A3
- B2
- B1
- B3
2: Low-side system leaks in a low-pressure chiller will often result in
- air being pulled into the system
- system refrigerant leaking from the system
- water being pulled into the system
- nitrogen leaking out of the system.
3: What is the voltage of each leg of a 480 Volt three-phase motor?
- 240v
- 208v
- 120v
- 277v
4: What would be the classification of a prison?
- Large mercantile
- Institutional
- Industrial
- Place of assembly
5: E = I X R is
- Ohms Law
- Amps Law
- Impedance Law
- Watts Law
6: "I" represents ____ in the Ohm's law formula.
- capacitance
- amperage
- voltage.
- resistance
7: A micron is
- one thousandths of a millimeter
- one millonths of a micrometer
- one millonths of a centimeter
- a larger unit of measurement than Hg
8: Which of the following is not an air velocity meter?
- Hydrometer
- Anemotherm
- Anemometer
- Velometer
9: The outer portion of shell of the compressor used on low-pressure chillers is called the
- volute
- nozzle
- suction
- baffle
10: 1 Watt = ______ BTU's?
- 4.482
- 7.216
- 12
- 3.412
11: What is the typical air conditioning operating pressures for R-22?
- 60 psi suction 210 psi discharge
- 25 psi suction 125 psi discharge
- 105 psi suction 340 psi discharge
- None of the above
12: What type of fuses must be used on a HVAC system?
- TR Type, Duel Element, Time Delay
- Fast blow
- 10% lower than RLA
- none of the above
13: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Tight fitting doors
- Self-closing doors
14: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- are obsolete.
- False
- depends on the type of refrigerant being used
- True
15: A movie theater would be considered a
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- institutional occupancy
16: The two float-type metering devices are the
- high-side float and the low-side float
- liquid float and the low-side float
- vapor float and the low-side float.
- liquid float and the vapor float
17: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- increases
- doesn't change
- decreases
- run as designed with low ambient controls
18: Give an example of a secondary coolant?
- R-717
- R-12
- R-410A
- R-718
19: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
20: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 4%
- 1%
- 25%
- 2%
21: 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
22: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
23: What type of copper is not permitted on refrigeration systems?
- Type N
- Type K
- Type M
- Type L
24: Refrigerant restricted in 2004 but used for transition for decades:
- R-11
- R-22
- R-123
- R-134A
25: What is a Category "D" fluid?
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- Any fluid that exceeds 150 psig and has design temperature of over 366F