Topics: All categories in the pool
1: Control systems can be classified by
- economy of operation
- tonnage of system
- source of power
- safety
2: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 10 amps
- 20 amps
- 5 amps
- 15 amps
3: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 55 lbs
- 500 lbs
- 660 lbs
4: How far from the ground does a relief valve need to be?
- At least 15' above grade
- Not more than 3' above grade
- At least 25' above grade
- At least 20' above grade
5: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the low side
- lower chamber of the high side
- lower chamber of the low side
- upper chamber of the high side
6: Low ambient controls are used when
- economizers are used
- always
- when systems run all year round
- on air conditioning systems only
7: What happens after your initial inspection of a pressure vessel?
- Notify the Fire Marshal that the system has been inspected and approved
- Notify the AHJ to let them know that the system been inspected
- Inspector leaves a metal tag with a certification listed on it
- There is a temporary shut-down until a final inspection can be performed.
8: How many flammability classifications are refrigerants in?
- 2
- 5
- 3
- 7
9: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
10: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- breaker panel in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- load-side of the contactor in
- first disconnect in
11: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Insulated and installed in a pipe duct (Encased)
- Certified
- Classifed
12: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
13: Machinery rooms must be vented to ______?
- basement
- outdoors
- unoccupied spaces
- neutralizing tank
14: Who is permitted to access a refrigeration machine room?
- Contractors only
- Any employee
- Anyone, it's a completely safe area
- Authorized persons only
15: What type of oil is used in R-410A systems?
- polyolester (POE)
- mineral oil
- naphthene
- polyalkylene glycol (PAG)
16: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device and a pressure relief valve installed
- shall have a pressure limiting device installed on the high side of the system
17: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 70.8 psig
- 50.2 psig
- 66.1 psig
- 43.3 psig
18: What is the state of the refrigerant leaving the evaporator?
- a low temperature subcooled liquid
- a high temperature superheated vapor
- low temperature superheated vapor
- a high temperature subcooled liquid
19: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 18
- 50
- 33
20: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
21: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
22: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 cubic feet or more
- 15 square feet or less
- 3 cubic feet or more
23: Relief valves are rated in
- pounds of air per hour
- gallons of water per hour
- pounds of air per minute
- gallons of water per minute
24: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the liquid side of the system
- the vapor side of the system
- low side of the system
- high side of the system
25: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 1 week
- 14 days
- 2 months
- 30 days