Topics: All categories in the pool
1: On a large centrifugal system, what meters the flow to the evaporator?
- TXV
- Low side float
- High side float
- Cap tube.
2: Suction line oil traps should be installed when the condenser is
- located outside the operates in temperatures below 35F
- more than 100' away from the evaporator
- in the basement and the evaporator is on the third floor
- on the third floor roof and the evaporator is in the basement
3: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
4: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 500
- 400
- 600
5: Name three things that must be done when changing refrigeration lubricant?
- Nothing must be done
- Place sign, check for leaks, insulate
- Make sure it's compatible, notify owner, notify AHJ
- You can't change lubricants.
6: A chiller entering and leaving temperature difference is?
- 20 degrees F
- 10 degrees F
- 50 degrees F
- 5 degrees F
7: Dew point is
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
- the temperature below which water vapor in the air will start to condense
- the temperature of air of 50% RH
8: The two basic types of evaporators are
- flooded and direct expansion
- direct expansion and plate
- finned and plate
- prime surface and finned
9: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
10: 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?
- 40 uf
- 15 uf
- 20 uf
- 25 uf
11: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- 2F difference
- a ling psychrometer doesn't have two theremometers.
- nearly the same
- far apart or greater difference
12: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Stop valve
- Moisture indicator
- Muffler
- Foot valve
13: Electricity involves the movement of electrons in atoms
- True
- False
14: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -100F to -40F
- -40F to 0F
- 30F to 50F
- 0F-38F
15: Which is considered the more efficient condenser?
- fan cooled
- air cooled
- water cooled
- spray cooled
16: Fractionation occurs when
- the pressures decreases as the heat load decreases
- when a fraction of refrigerant is added as the full charge
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- the pressures increase as the heat load increases
17: Start to Run windings will have what resistance?
- All will be at equal values
- The most resistance value
- The least resistance value
- Somewhere between the actual start winding and run winding resistance value
18: 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
- licensed technician
- welder qualified
- licensed welder
- competent welder
19: A restaurant is classified as a
- large mercantile occupancy
- mixed occupancy
- public assembly occupancy
- commercial occupancy
20: A motor starter contains a thermal overload and a
- solenoid
- 3-way relay
- transformer
- contactor
21: When must refrigeration system covered by the code be inspected?
- Not required
- Upon installation
- Annually and when installed
- Annually
22: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
23: How many square inches per square foot?
- 24
- 98
- 144
- 64
24: R-22 is considered a(n)
- CFC
- HFC
- HCFCH
- HCFC
25: The color code of a tank of ammonia is
- silver
- light green
- white
- lavender