Topics: All categories in the pool
1: An accumulator can be located between the
- evaporator and compressor
- compressor and condenser
- condenser and evaporator
- first stage and second stage compressors
2: R-717 is
- ammonia
- trichloromethane
- carbon dioxide
- water
3: Electricity involves the movement of electrons in atoms
- True
- False
4: The instrument used to measure the specific gravity of absorption chiller solutions is the
- Psychrometer
- anemometer
- refractometer
- hydrometer
5: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
6: A Lithium-bromide system is an absorption system that
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses water as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
7: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
8: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
9: one BTU equals
- 31.4 hp
- 3.41 hp
- Pi
- 12,000 hp
10: Large mercantile occupancy is
- 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 or that portion of a premise where more than 200 persons congregate on levels above or 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 1500 persons congregate on levels above or below street level to purchase personal merchandise
11: On cooling towers, what causes the condenser water to drop
- tower fans
- evaporation of the water droplets
- ambient temperatures
- sensible heat
12: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-11
- R-12
- R-113
13: Low pressure chiller systems use what type of compressor?
- Reciprocating
- Scroll
- Screw
- Centrifugal
14: Which refrigerant is lighter than air?
- R-717
- R-11
- R-123
- R-134a
15: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- System operating pressure will drop
- The Li-Br solution will become more diluted
- Rust can form
- The Li-Br solution will become more concentrated
16: How many flammability classifications are refrigerants in?
- 5
- 3
- 2
- 7
17: What is the amp draw of a 40 VA transformer at 24 volts
- 1.6 amps
- 1,000 amps
- 106 amps
- 1K amps
18: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- green
- red
- orange
- blue
19: What must be done to refrigerant pipes before being buried?
- Leaked checked
- Encased
- Coated
- Certified
20: What pipe can not be used for refrigeration?
- L
- N
- M
- K
21: 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
22: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 71 ohms
- 27 ohms
- 80 ohms
- 104 ohms
23: Class A refrigerants are considered
- non-flammable
- non-toxic
- toxic
- flammable
24: What device should be used on low-temperature freezers?
- discharge muffler
- high capacity TXV
- oil separator
- hot-gas by-pass
25: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 30'
- At least 40'
- At least 20'
- There is no minimum for relief valve and windows.