Topics: All categories in the pool
1: "P" represents ______ in the Watt's law formula
- watts
- reactance
- amperage
- voltage
2: All electrical work done on refrigeration systems must comply with
- NEC and Massachusetts Modifications
- OSHA
- Department of Energy
- ASHREA-15 Section 9.2.1
3: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
4: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
5: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
6: Gauge pressure is
- absolute pressure
- force of pressure above that of atmospheric
- atmospheric pressure
- what a gauge reads when checking pressures on a chilled water system.
7: Copper and its alloys shall not be used with ammonia
- True
- False
8: Ammonia belongs to Group
- A-1
- B-1
- A-2
- B-2
9: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
10: Most CFC's are
- inert
- toxic
- inert but toxic
- flammable
11: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- overcharge of oil
- leaking discharge valves in the compressor
- plugged drier
12: A tachometer is an instrument used to measure
- air velocity
- RPM
- static pressure
- speed
13: R-22 is considered a(n)
- CFC
- HFC
- HCFCH
- HCFC
14: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-2
- A-1
- B-1
15: Pi equals approximately
- 3.41
- 3.14
- 12,000
- 746
16: What must be done to refrigerant pipes before being buried?
- Coated
- Leaked checked
- Encased
- Certified
17: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
- shall have a pressure limiting device and a pressure relief valve installed
18: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
19: When an inspection is needed, how often must it be done?
- every 36 months
- every 18 months
- annually
- every 24 months
20: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
21: Sublimation occurs when
- gas is formed from a liquid
- ice melts and turns to water
- gas is formed directly from a solid
- liquid is formed from a gas
22: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
23: What is used to check very low air pressures in air conditioning duct?
- Vacuum gauge
- Barometer
- Anemomter
- Manometer
24: The critical temperature of a refrigerant gas occurs when
- any decrease in pressure will cause condensation
- the gas returns to a liquid
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
25: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5