Topics: All categories in the pool
1: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- welder qualified
- competent welder
- licensed welder
- licensed technician
2: A chiller entering and leaving temperature difference is?
- 5 degrees F
- 50 degrees F
- 20 degrees F
- 10 degrees F
3: Heat is a form of
- power
- work
- matter
- energy
4: How many different groups of refrigerants are there?
- 7
- 15
- 3
- 11
5: A device used to measure small pressure differences is the
- manometer
- anemometer
- pyrometer
- phsycometirc
6: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- overcharge of oil
- plugged drier
- leaking discharge valves in the compressor
7: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
8: "I" represents ____ in the Ohm's law formula.
- voltage.
- resistance
- capacitance
- amperage
9: R-12 is
- dichloromethane
- dichlorofluoromethane
- trichlorofluoromethane
- dichlorodifluoromethane
10: A hissing noise at the expansion valve is a good indication that
- nothing is passing thru
- gas is passing thru it
- liquid is passing thru it
- expansion valve is oversized
11: 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
12: The actual expansion curve of compression follows most nearly which one of the following curves?
- Isothermal
- Volume Temperature
- Pressure Temperature
- Adiabatic
13: An accumulator can be located between the
- evaporator and compressor
- first stage and second stage compressors
- condenser and evaporator
- compressor and condenser
14: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Nesting scrolls
- Fan-like action
- Suction and discharge valves
- Rotating vanes
15: The freezing point of water at sea level is?
- 32C
- 0F
- -10C
- 32F
16: If your suction line is warmer than the room temperature, this may indicate
- a low charge
- below normal superheat
- an over charge
- plugged air filter
17: Which refrigerant replaced R-12?
- R-407A
- R-410A
- R-22
- R-134A
18: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
19: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
20: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- leak checked
- moisture barrier
- insulated
21: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
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: Where must a refrigeration contractor's license number be displayed?
- Uniforms, checks, and invoices.
- Truck, office, every job, and on all equipment
- Trucks, invoices, and advertising
- Trucks, license plates, and uniforms
24: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Water and soap
- Moisture and air
- Air and dirt
- Oil and water
25: The best way to determine the voltage requirement for an electrical component is to
- read the voltage with a mulitmeter
- determine the capacity of the service panel
- check with the utility company
- read the nameplate data