Topics: All categories in the pool
1: A water regulating valve opens when
- the compressor is on
- when the power is on
- the head pressure rises
- when the power is on there is an overcharge of refrigerant
2: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Simple
- Low pressure
- R-414B
- Cascade
3: A motor starter contains a thermal overload and a
- 3-way relay
- solenoid
- transformer
- contactor
4: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.00'
- 7.25'
- 9.00'
- 8'4"
5: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
6: Who authorizes changes to the safety codes?
- Person who pulled the permit
- Contractor who last serviced the system.
- Person in charge of the facility
- Board of Boilers
7: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 58F
- 70F
- 77F
- 32F
8: 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
9: A tachometer is an instrument used to measure
- static pressure
- air velocity
- RPM
- speed
10: The Department that certifies the transportation of refrigerant is the
- RSES
- DOT
- EPA
- EPO
11: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
12: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
13: The External equalizer of a TXV compensates for
- pressure drop across the evaporator coil
- pressure within the evaporator
- pressure within the system
- pressure drop across the condenser coil
14: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- absorbed solution
- strong solution
- concentrated solution
- weak solution
15: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
16: What is a high-side float?
- Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
- An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
- Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
- Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
17: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 2.2
- 1.2
- 1
- 1.5
18: A start capacitor is wired in _____ with the start windings.
- series
- junction
- series-parallel
- parallel
19: What do you need to do when you install a new system?
- Insulate the suction line before you take a superheat reading
- Add refrigerant
- Document the superheat and subcooling reading
- Have it inspected
20: What is the refrigerant chlorodifluoromethane?
- R-134a
- R-123
- R-12
- R-22
21: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- orange
- blue
- green
- red
22: On a single phase motor, when does the start winding cut out?
- Start windings do no cut-out of the run cycle
- At 75% of its full rated speed
- At 25% of its full rated speed
- At 50% of its full rated speed
23: Ammonia vaporization takes place at what temperature?
- -28F
- -110F
- -460F
- -32F
24: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- adjustment of the spring tension of the TXV
- opening at the pump outlet
- opening at the pump inlet
- cooling temperature set-point
25: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False