Topics: All categories in the pool
1: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- leak checked
- insulated
2: What is an egress?
- A code violation
- An entrance or exit
- A valve put on the low side of the system to prevent frosting
- An escape route
3: Total heat of a substance is considered
- empathetical
- enthalpy
- sensible heat
- specific heat
4: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the outdoors
- the return air ducted system
- the mechanical room housing the refrigeration system
- Machinery rooms need not be vented
5: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
6: If the power element of an expansion valve should lose its charge the valve would
- go closed
- underfeed the evaporator
- overfeed the evaporator
- go open
7: Which is considered the more efficient condenser?
- fan cooled
- spray cooled
- air cooled
- water cooled
8: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 75
- 24
- 100
- 50
9: What refrigerant were phased out in 2004?
- R-12
- R-134a
- R-22
- R-11
10: Ammonia systems use ____ pressure to adjust oil pressure
- liquid
- air
- discharge
- stream
11: Increasing superheat will do what to your frost line?
- Nothing
- Could either increase or decrease depending on the load conditions
- Increasae
- Decrease
12: A class B1 refrigerant is considered
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic but non-flammable
- toxic and somewhat flammable
13: 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
14: A moisture indicator must
- be sight side up
- change color when exposed to moisture
- be filled with liquid
- be yellow
15: Capacitors are rated in
- kelvins
- volt - amperes
- micro-farads
- megaohms
16: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 1000F
- 600F
- 700F
- 800F
17: Foaming of oil in a compressor is most likely to occur
- when ambient temperature are low
- when the evaporator temperatures are below 32F
- when there is insufficient air across the condenser(i.e., dirty coil)
- at start-up
18: Which refrigerant replaced R-12?
- R-407A
- R-22
- R-410A
- R-134A
19: Evaporators within 18" of a heating coil must be equipped with a
- low limit control
- high limit control
- zone valve
- pressure relief device
20: Most CFC's are
- flammable
- inert but toxic
- toxic
- inert
21: A capacitor in series with the start windings will do what?
- Nothing
- Decrease the RLA to within 10% of its rating
- Increase run efficiency by 10% of its rating
- Increase starting torque
22: The purpose of an accumulator is to
- reduce friction loss to the flow of refrigerant
- assure no liquid returns to the compressor
- store excess refrigerant from the reciver
- filter out impurities from the system
23: 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
- 257 psig, 77 psig
- 226 psig, 68 psig
- 455 psig, 185 psig.
24: 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
- competent welder
- licensed welder
- welder qualified
- licensed technician
25: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above