Topics: All categories in the pool
1: Heat transferred by conduction from one body to another is done
- via solids
- via radiation
- via liquids
- via heat rays
2: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
- shall use fusible plugs
3: The principle used in continuous type absorption systems is
- Ohm's Law
- Boyle's Law
- Dalton's Law
- Charles's Law
4: A movie theater would be considered a
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- institutional occupancy
5: R-11 has the greatest corrosive effect on
- Bronze
- Aluminum
- Magnesium
- Copper
6: Industrial occupancy is
- a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
- is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- Both a and b are correct
7: What is an egress?
- An escape route
- A code violation
- An entrance or exit
- A valve put on the low side of the system to prevent frosting
8: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 25
- 22
- 66
9: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- phosgene gas sening
- CO Sensing
- A group sensing
10: A hotel is considered a _______ occupancy.
- residential
- institutional
- commercial
- mercantile
11: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
12: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 5 amps
- 10 amps
- 15 amps
- 20 amps
13: A low oil switch is typically
- automatic reset
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
- manual reset
14: When air is ducted through a machine room that services occupied space, What must be done?
- Flanged and gasketed
- Welded and seamed.
- Ducted and sealed
- Insulated and cross broke
15: 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.
16: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
17: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
18: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
19: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
20: How many forces operate a thermostatic expansion valve?
- 1
- 4
- 2
- 3
21: Which occupancy can ammonia be used in?
- depends on the quantity of freon
- industrial
- commercial
- redifential
22: Two systems using separate refrigerants that are superimposed upon one another is called
- booster
- cascade
- single stage
- indirect
23: Foaming of oil in a compressor is most likely to occur
- when the evaporator temperatures are below 32F
- when there is insufficient air across the condenser(i.e., dirty coil)
- at start-up
- when ambient temperature are low
24: How many flammability classifications are refrigerants in?
- 3
- 5
- 7
- 2
25: Increasing superheat will do what to your system?
- Decrease liquid flow
- Increase gas flow
- Increase liquid flow
- Nothing