Topics: All categories in the pool
1: Volts x amps equals
- Ohms Law
- Impedance
- Watts
- Inductance
2: The two float-type metering devices are the
- liquid float and the vapor float
- high-side float and the low-side float
- vapor float and the low-side float.
- liquid float and the low-side float
3: 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
4: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- institutional occupancy
- commercial occupancy
- mixed occupancy
5: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 1.5
- 2.2
- 1.2
6: Which refrigerant class listed below is the most flammable?
- C-3
- B-2
- A-3
- A-1
7: At higher altitudes, the boiling point of refrigerant is
- higher
- equal to the coefficient of water at 32F
- lower
- the same
8: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- starved evaporator
- too small evaporator
- overcharged
- compressor suction valve stuck open
9: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
10: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- EEV
- EPR valve
- CPR valve
- Solenoid valve
11: "I" represents ____ in the Ohm's law formula.
- capacitance
- resistance
- voltage.
- amperage
12: A professional or office building would be considered what type of occupancy?
- commercial
- mercantile
- business
- public assembly
13: Horizontal piping should be run level.
- False
- No, unless the supervisor on the job says so.
- True
- Yes, if the condenser is located above the evaporator
14: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
15: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
16: On a large centrifugal system, what meters the flow to the evaporator?
- TXV
- High side float
- Low side float
- Cap tube.
17: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Place sign, check for leaks, and insulate suction line
- you can never change refrigerants
- Make sure its compatible, notify owner, and notify AHJ.
- Nothing must be done
18: All electrical work done on refrigeration systems must comply with
- ASHREA-15 Section 9.2.1
- OSHA
- NEC and Massachusetts Modifications
- Department of Energy
19: What is considered a cooling agent?
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat when condensation occur
- any liquid used for the transmission of heat when vaporization occurs
20: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three run windings
- three run windings and 3 start windings
- three start windings
21: 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?
- Air and dirt
- Moisture and air
- Oil and water
- Water and soap
22: How many opening forces operate a thermostatic expansion valve?
- 2
- 1
- 3
- 4
23: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
24: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- annually
- every 18 months
25: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices