Topics: All categories in the pool
1: What is Absolute Zero?
- -460F
- -400F
- -640F
- -773F
2: What instrument is used to measure very high resistance?
- voltmeter
- ammeter
- meg ohmmeter
- tape measure
3: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- EEV
- Solenoid valve
- EPR valve
- CPR valve
4: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
5: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
6: What does safe access mean?
- Well-lit exit signs
- A clear unobstructed path to the equipment and controls
- Locked doors
- OSHA approved
7: Horizontal piping should be run level.
- True
- No, unless the supervisor on the job says so.
- Yes, if the condenser is located above the evaporator
- False
8: How many refrigerant classifications are there for toxicity?
- 1
- 3
- 5
- 2
9: Low-side system leaks in a low-pressure chiller will often result in
- system refrigerant leaking from the system
- nitrogen leaking out of the system.
- air being pulled into the system
- water being pulled into the system
10: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
11: A normal operating evaporator temperature of R-22 for air conditioning is typically
- 45F
- 32F
- 58F
- 55F
12: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
13: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or more
- 15 square feet or less
- 15 cubic feet or more
- 3 cubic feet or less
14: On a pumpdown system, the liquid-line solenoid is controlled by the
- low pressure switch
- defrost timer
- low-ambient controller
- thermostat
15: Ammonia vaporization takes place at what temperature?
- -110F
- -460F
- -28F
- -32F
16: A self contained system
- is a unit system Group I refrigerants only
- is a unit system Group II refrigerants only
- is a complete factory made and tested system
- is any system or part of a system used to increase evaporation by expansion or vaporization
17: Which refrigerant class listed below is the most flammable?
- B-2
- A-3
- A-1
- C-3
18: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Latent heat
- Enthalpy
- Specific heat
- Sensible heat
19: What type of material can't be used on the outlet of a relief valve?
- PVC
- Magnesium alloy
- Stainless steel
- Copper
20: No open flames are allowed in the machinery room unless?
- Approved by the authorized person
- Never can be allowed
- Approved by the installing contractor
- Only when combustion air is provided from outside of the machinery room
21: All serviceable components of a refrigeration system shall be provided with
- safe access
- service manuals
- manufactures instructions on start-up procedures
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
22: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
23: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Anyone, it's a completely safe area
- Contractors only
- Any employee
24: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Certified
- Classifed
- Insulated and installed in a pipe duct (Encased)
- Leak checked
25: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 50% Li-Br, 50% tap water
- 40% Li-Br, 60% distilled water
- 60% Li-Br, 40% distilled water
- 40% Li-Br, 60% tap water