Topics: All categories in the pool
1: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
2: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
3: What is a high-side float?
- 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 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
- 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
4: Horizontal piping should be run level.
- No, unless the supervisor on the job says so.
- False
- Yes, if the condenser is located above the evaporator
- True
5: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
- CFM and HP decrease
- CFM and HP increase
- RPM and CFM increase
- CFM and RPM decrease
6: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- nearly the same
- 2F difference
- a ling psychrometer doesn't have two theremometers.
- far apart or greater difference
7: What is used to check very low air pressures in air conditioning duct?
- Barometer
- Vacuum gauge
- Manometer
- Anemomter
8: Ammonia is under what safety classification?
- A3
- B2
- B3
- B1
9: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
10: The low pressure oil safety switch
- resets itself automatically
- resets itself after the time delay has terminated
- never trips
- must be reset manually
11: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's a non-flammable refrigerant
- Because it's water
- Because it's cheap
12: Where would the EPR valve be located on a multiple evaporator system?
- outlet of low temperature evaporator
- inlet of the low temperature evaporator.
- outlet of high temperature evaporator
- outlet of the liquid line
13: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
14: How much clearance do you need around the perimeter of electrical panels?
- 12"
- 18"
- 36"
- 24"
15: Heat is a form of
- matter
- work
- power
- energy
16: A relief valve discharge capacity is rated in
- PSIG
- temperature minus pounds of air per second divided by release rate squared
- PSIA
- Pounds of air per minute.
17: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 6.6 lbs
- 22 lbs
- 13.9 lbs
- 44 lbs
18: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
19: Before replacing a seized compressor, the _______ should be determinded.
- cause of seizure
- current draw
- type of refrigerant
- designed head pressure
20: What is R-22?
- Chlorofluoromethane
- HFC
- Chlorodifluoromethane
- CCFCM
21: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
22: Capacity control on an absorption system is typically accomplished by varying the
- speed of the condenser water circulator pump
- pressure setting on the system's rupture disc
- rate at which heat is supplied to the generator
- speed of the chilled water circulatory pump
23: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- public assembly occupancy
- institutional occupancy
- mixed occupancy
24: Which refrigerant is lighter than air?
- R-123
- R-11
- R-717
- R-134a
25: Transformers are rated in
- volt-amps
- volts-ohms
- volts
- amps