Topics: All categories in the pool
1: Start to Run windings will have what resistance?
- Somewhere between the actual start winding and run winding resistance value
- All will be at equal values
- The least resistance value
- The most resistance value
2: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
3: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM, pipe size, and equivalent head.
- GPM and balanced head and friction head
4: Where is the high-side float located on a chiller system?
- discharge line
- inside the chiller barrel
- liquid line
- flash line
5: A EPR valve is installed on what type of evaporators?
- shell and tube evaporators
- low-temperature evaporators
- plate evaporators
- high-temperature evaporators
6: Who approves containers for refrigerants?
- E.P.A
- D.O.D
- D.O.E
- D.O.T
7: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- No, never
- When mixed with R-718
- Yes, always
8: A solder joint melts at temperatures of
- 1,200F to 1,500F
- less than 400F
- 400F to 800F
- 600F to 900F
9: How would you know if there was a loss of crankcase pressure?
- oil will thicken
- oil will thin out
- oil level will rise
- oil will foam
10: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 22
- 25
- 50
11: A split-phase motor has a ______ winding and a ____ winding
- run, start
- run, common
- duel-run, duel-start
- start, common
12: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 29F
- 11F
- 9F
- 21F
13: How much clearance do you need around the perimeter of electrical panels?
- 12"
- 18"
- 36"
- 24"
14: The actual expansion curve of compression follows most nearly which one of the following curves?
- Volume Temperature
- Isothermal
- Adiabatic
- Pressure Temperature
15: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- green
- red
- blue
- orange
16: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 40% Li-Br, 60% distilled water
- 40% Li-Br, 60% tap water
- 50% Li-Br, 50% tap water
- 60% Li-Br, 40% distilled water
17: 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
18: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and the stop valve
- between the compressor and reciever
- between the compressor and oil separator
19: Usually dry bulb temperature is
- same as wet bulb temperature
- not important and shall be ignored
- lower than dry bulb temperature
- higher than wet bulb temperature
20: A movie theater would be considered a
- institutional occupancy
- commercial occupancy
- public assembly occupancy
- mixed occupancy
21: An oil pressure safety switch should be set at
- 5 to 10 psi below low side pressure
- 5 to 10 psi above low side pressure
- 10 to 15 psi below low side pressure
- 10-15 psi above low side pressure
22: A motor starter contains a thermal overload and a
- contactor
- solenoid
- transformer
- 3-way relay
23: The evaporator is a device to
- store liquid refrigerant
- absorb heat into the refrigeration system
- Keep the compressor busy
- remove heat from the refrigeration system
24: Give an example of a secondary coolant?
- R-410A
- R-12
- R-717
- R-718
25: Low-side system leaks in a low-pressure chiller will often result in
- nitrogen leaking out of the system.
- air being pulled into the system
- water being pulled into the system
- system refrigerant leaking from the system