Topics: All categories in the pool
1: Where must a refrigeration contractor's license number be displayed?
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
2: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
- shall be installed per instruction of the AHJ
3: A device used to measure small pressure differences is the
- phsycometirc
- manometer
- pyrometer
- anemometer
4: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-2
- A-2
- B-1
5: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
6: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's water
- Because it's a non-flammable refrigerant
- Because it's cheap
7: Which occupancy can ammonia be used in?
- industrial
- commercial
- depends on the quantity of freon
- redifential
8: What is an egress?
- An escape route
- An entrance or exit
- A code violation
- A valve put on the low side of the system to prevent frosting
9: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device and a pressure relief valve installed
- does not require a pressure-limiting device
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device installed on the high side of the system
10: Bubbles in the liquid line sight glass could be caused by
- plugged drier
- bad low pressure switch
- overcharge of oil
- leaking discharge valves in the compressor
11: 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
- first disconnect in
- breaker panel in
- load-side of the contactor in
- 24 volt secondary side of the Class 2 transformer to the thermostat
12: A self contained system
- is any system or part of a system used to increase evaporation by expansion or vaporization
- is a complete factory made and tested system
- is a unit system Group II refrigerants only
- is a unit system Group I refrigerants only
13: The leaving chilled water set point for comfort cooling is typically?
- 60
- 66
- 38
- 45
14: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
15: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
16: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 3.0, 3.5
- 2.5, 2.5
- 6.6, 6.6
- 2.5, 3.0
17: Stop valves shall not be permitted between the system and the
- bleed valve
- relief valve
- service valve
- condenser
18: The measurement of heat in a particular substance is
- latent heat
- enthalpy
- sensible heat
- specific heat
19: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 24
- 18
- 10
- 15
20: When an inspection is needed, how often must it be done?
- annually
- every 18 months
- every 24 months
- every 36 months
21: A Low-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter the occupied space
22: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 15 uf
- 40 uf
- 20 uf
- 25 uf
23: 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
24: 746 watts is equal to
- 1 hp
- 10 hp
- Pi
- 100 hp
25: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 75%
- 80%
- 90%
- 99%