Topics: All categories in the pool
1: What is a megaohm meter?
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- 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
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
2: R-11 has the greatest corrosive effect on
- Bronze
- Aluminum
- Magnesium
- Copper
3: 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
- 24 volt secondary side of the Class 2 transformer to the thermostat
- load-side of the contactor in
- first disconnect in
- breaker panel in
4: Setting a pressure relief device shall not exceed ___ of the design pressure
- 80%
- 75%
- 100%
- 90%
5: 1 HP = ____ Watts?
- 11,239
- 3.1416
- 3,412
- 746
6: A motor starter contains a thermal overload and a
- contactor
- transformer
- 3-way relay
- solenoid
7: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Zinc
- Magnesium
- Nickel
8: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Certified
- Classifed
- Insulated and installed in a pipe duct (Encased)
9: Refrigerant restricted in 2004 but used for transition for decades:
- R-11
- R-22
- R-123
- R-134A
10: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 600 watts
- 5KW
- 1000 watts
- 746 watts
11: The difference between saturated liquid and saturated vapor is
- pressure
- heat
- volume
- temperature
12: A split-phase motor has a ______ winding and a ____ winding
- start, common
- run, start
- duel-run, duel-start
- run, common
13: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- mixed occupancy
- institutional occupancy
- public assembly occupancy
14: On a single phase motor, when does the start winding cut out?
- 25% of its RLA speed
- 50% of its RLA speed
- 75% of its RLA speed
- 100% of its RLA speed
15: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- store excess refrigerant from the reciver
- filter out impurities from the system
- reduce friction loss to the flow of refrigerant
16: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 3/4"
- 3/8"
- 5/8"
- 1/2"
17: What is not a requirement of a class T machine room?
- tight fitting doors
- fire hose connection to the building fire protection system
- automatic ventilation
- self-closing doors
18: The Board of Boilers adopts by reference
- the 1997 ANSI/ASHRAE Safety Code
- Montreal Protocol Safety Code
- the MACS Pressure Vessel Code of Massachusetts
- MSCA Code
19: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 365 psig, 120 psig
- 226 psig, 68 psig
- 455 psig, 185 psig.
- 257 psig, 77 psig
20: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
21: Sublimation occurs when
- gas is formed directly from a solid
- ice melts and turns to water
- gas is formed from a liquid
- liquid is formed from a gas
22: Lithium-bromide, Li-Br, is best characterized as a
- salt
- sugar
- soil
- sand
23: Fractionation occurs when
- the pressures increase as the heat load increases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- when a fraction of refrigerant is added as the full charge
- the pressures decreases as the heat load decreases
24: If the power element of an expansion valve should lose its charge the valve would
- underfeed the evaporator
- go open
- go closed
- overfeed the evaporator
25: Suction line oil traps should be installed when the condenser is
- in the basement and the evaporator is on the third floor
- located outside the operates in temperatures below 35F
- more than 100' away from the evaporator
- on the third floor roof and the evaporator is in the basement