Topics: All categories in the pool
1: How many square inches per square foot?
- 98
- 144
- 64
- 24
2: Where must a refrigeration contractor's license number be displayed?
- Uniforms, checks, and invoices.
- Trucks, invoices, and advertising
- Trucks, license plates, and uniforms
- Truck, office, every job, and on all equipment
3: The Department that certifies the transportation of refrigerant is the
- EPO
- DOT
- RSES
- EPA
4: When an inspection is needed, how often must it be done?
- every 36 months
- every 18 months
- annually
- every 24 months
5: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 9 ASHRAE-15 ASME VIII unfired
6: Most CFC's are
- inert
- inert but toxic
- toxic
- flammable
7: Lithium-bromide, Li-Br, is best characterized as a
- soil
- sand
- salt
- sugar
8: On a TXV, the purpose of an external equalizer is to?
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
- allow a greater adjustment spam
- compensate for a pressure drop across the evaporator coil
9: 1 Watt = ______ BTU's?
- 3.412
- 7.216
- 12
- 4.482
10: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
11: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 15 uf
- 25 uf
- 20 uf
- 40 uf
12: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
- RPM and CFM increase
- CFM and HP increase
- CFM and HP decrease
- CFM and RPM decrease
13: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
14: What is potential measured in?
- Volts
- Ohms
- Henrys
- Amps
15: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- a ling psychrometer doesn't have two theremometers.
- far apart or greater difference
- 2F difference
- nearly the same
16: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
17: The main purpose of the accumulator is to
- provide space for the accumulation of oil and containminants
- store liquid refrigerant
- prevent liquid slugs at the compressor
- provide space for vapor to accumulate
18: Volts x amps equals
- Inductance
- Ohms Law
- Impedance
- Watts
19: Pi equals approximately
- 3.14
- 746
- 12,000
- 3.41
20: An accumulator can be located between the
- condenser and evaporator
- compressor and condenser
- first stage and second stage compressors
- evaporator and compressor
21: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- mixed occupancy
- institutional occupancy
- public assembly occupancy
- commercial occupancy
22: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
23: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
- 226 psig, 68 psig
- 257 psig, 77 psig
- 455 psig, 185 psig
- 350 psig, 120 psig
24: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
25: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.2
- 1
- 1.5
- 2.2