Topics: All categories in the pool
1: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
2: Where is the high-side float located on a chiller system?
- inside the chiller barrel
- flash line
- discharge line
- liquid line
3: 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
4: What does safe access mean?
- OSHA approved
- Well-lit exit signs
- A clear unobstructed path to the equipment and controls
- Locked doors
5: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- CO Sensing
- A group sensing
- phosgene gas sening
- refrigerant sensing
6: Large mercantile occupancy is
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
7: How are a compressor and condenser fan wired?
- series
- parallel-series
- series-parallel
- parallel
8: R-22 is considered a(n)
- HCFCH
- CFC
- HCFC
- HFC
9: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM, pipe size, and equivalent head.
10: The principle used in continuous type absorption systems is
- Dalton's Law
- Ohm's Law
- Boyle's Law
- Charles's Law
11: If two 500 ohm resistors are connected in series, the resistance will be
- 20 ohms
- 500 ohms
- 1000 ohms
- 200 ohms
12: Horizontal piping should be run level.
- False
- Yes, if the condenser is located above the evaporator
- No, unless the supervisor on the job says so.
- True
13: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-113
- R-22
- R-12
14: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
15: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
16: Pi equals approximately
- 3.14
- 3.41
- 12,000
- 746
17: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- When mixed with R-718
- No, never
- Yes, always
18: Capacity control on a centrifugal compressor is accomplished by the
- slide vanes
- pre-rotational guide vanes
- check valves
- post-rotational guide vanes
19: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Aluminum
- Copper
- Stainless steel
20: When using nitrogen for brazing, the pressure should be:
- Very low
- Slightly below atmospheric
- 125 psig
- 50-100 psig
21: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or more
- 15 square feet or less
- 3 cubic feet or less
22: A cross charged power element on an expansion valve would normally be used in what temperature range?
- 0F-38F
- 30F to 50F
- -40F to 0F
- -100F to -40F
23: All electrical work done on refrigeration systems must comply with
- Department of Energy
- OSHA
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
24: A class B1 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- toxic but non-flammable
- non-toxic but highly flammable
25: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above