Topics: All categories in the pool
1: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
2: The difference between saturated liquid and saturated vapor is
- volume
- pressure
- heat
- temperature
3: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 22
- 66
- 25
4: _____ and its alloys are suitable for use with ammonia systems.
- Aluminum
- Copper
- Zinc
- Magnesium
5: Machinery rooms must be vented to ______?
- unoccupied spaces
- neutralizing tank
- basement
- outdoors
6: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- mixed occupancy
- institutional occupancy
- public assembly occupancy
- commercial occupancy
7: How many groups of refrigerants are there?
- 1
- 5
- 7
- 3
8: Cooling tower lowers condenser water temp by
- condensation
- running water thru a secondary heat exchanger
- running fans at 100%
- evaporative cooling
9: High pressure controls should be set no higher than
- 90% of set point
- 10% of set point
- 25% of set point
- 80% of set point
10: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
11: The Department that certifies the transportation of refrigerant is the
- RSES
- DOT
- EPO
- EPA
12: What is the state of the refrigerant leaving the evaporator?
- a high temperature subcooled liquid
- low temperature superheated vapor
- a high temperature superheated vapor
- a low temperature subcooled liquid
13: What would be the classification of a prison?
- Place of assembly
- Industrial
- Institutional
- Large mercantile
14: 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
15: How many volts would you read on a 480V system phase to phase?
- 480
- 277
- 1/3 the voltage
16: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- Low head pressure and high suction pressure
- High head pressure and low suction pressure
- Low suction pressure and low discharge pressure
- High suction pressure and high discharge pressure.
17: The rupture disc on a low-pressure chiller typically releases pressure at
- 15 psig
- 0 psig
- 5 psig
- 10 psig
18: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- latent heat
- specific heat
- lost heat
- sensible heat
19: The two float-type metering devices are the
- high-side float and the low-side float
- liquid float and the vapor float
- vapor float and the low-side float.
- liquid float and the low-side float
20: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 100,000
- 100
- 10,000
21: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- T&P device
- Circuit Breaker
- Relief valve
22: A capacitor in series with the start windings will do what?
- Nothing
- Decrease the RLA to within 10% of its rating
- Increase starting torque
- Increase run efficiency by 10% of its rating
23: What do you need to do when you install a new system?
- Add refrigerant
- Have it inspected
- Document the superheat and subcooling reading
- Insulate the suction line before you take a superheat reading
24: What pipe can not be used for refrigeration?
- L
- M
- N
- K
25: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
- it is hydroscopic
- it traps moisture
- viscosity
- all of the above