Topics: All categories in the pool
1: Which of the following controllers would you expect to be most sensitive to temperature changes?
- aquastat
- low voltage t-stat
- line voltage t-stat
- immersion controller
2: The critical temperature of a refrigerant gas occurs when
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
3: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
4: Low ambient controls are used when
- economizers are used
- always
- on air conditioning systems only
- when systems run all year round
5: What refrigerant doesn't have to be classifted?
- R-718
- R-711
- R-717
- R-134a
6: Class A refrigerants are considered
- non-toxic
- toxic
- flammable
- non-flammable
7: What would be the classification for Stop & Shop grocery store?
- Industrial
- Place of assembly
- Large mercantile
- Instituional
8: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- Ceiling height
- 72"
- 7.25'
9: Can ammonia be used on domestic system?
- yes
- no
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
10: At higher altitudes, boiling temperatures
- increase
- decrease
- are unaffected
- depends on the refrigerant
11: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 977.6 watts
- 9.776 watts
- 9,776 watts
- .9776 watts
12: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
13: 1 Watt = ______ BTU's?
- 4.482
- 7.216
- 12
- 3.412
14: A EPR valve is installed on what type of evaporators?
- plate evaporators
- low-temperature evaporators
- high-temperature evaporators
- shell and tube evaporators
15: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- 15
- 10
- III
16: Three-phase motors have what type of windings?
- three run windings and 3 start windings
- three start windings
- one start winding and one run winding.
- three run windings
17: What refrigerant doesn't have to be classified?
- R-422A
- R-134A
- R-717
- R-718
18: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 600
- 400
- 500
19: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 3/4"
- 3/8"
- 5/8"
- 1/2"
20: How many gallons of water per pound of ammonia do you need?
- 15
- 5
- 20
- 1
21: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device and a pressure relief valve installed
22: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 3.415
- 16.64
- 6.830
- 34.15
23: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
24: 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?
- Moisture and air
- Oil and water
- Air and dirt
- Water and soap
25: A tachometer is an instrument used to measure
- speed
- air velocity
- static pressure
- RPM