Topics: All categories in the pool
1: Where is the high-side float located on a chiller system?
- inside the chiller barrel
- flash line
- discharge line
- liquid line
2: On a centrifugal compressor, stationary diffuser vanes are needed to
- increase the clearance space
- convert velocity energy to pressure
- prevent high pressure on the packing
- stop gas flow
3: The equivalent length of pipe in a water piping system is
- the total length of pipe as you would measure it
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe plus equivalent of fittings multiplied by 2.31
4: Brazed joints melt at temperatures above
- 1,000F
- 500F
- 1,200F
- 800F
5: What does an anemometer measure?
- voltage
- temperature
- velocity
- amperage
6: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
7: Pipe identification labels are required when the system contains more than
- 110 lbs
- 65 lbs
- 55 lbs
- 120 lbs
8: Heat is a form of
- power
- energy
- matter
- work
9: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
10: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
11: When should a relief valve start to function?
- Before the purge station discharges
- 10 psi before it's set pressure
- Two times it's working pressure
- At it's set pressure
12: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- opening at the pump inlet
- cooling temperature set-point
- adjustment of the spring tension of the TXV
- opening at the pump outlet
13: The certificate of inspection
- shall be posted and protected from dirt, water, and other elements
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
14: All electrical work done on refrigeration systems must comply with
- ASHREA-15 Section 9.2.1
- OSHA
- Department of Energy
- NEC and Massachusetts Modifications
15: Name a reason that does not cause reduced condenser air quantity
- Dirty Coil
- High ambient temperature
- Prevailing winds
- Dirty fan blades
16: The density of a gas refers to
- pounds per absolute pressure
- cubic feet per pound
- pounds per cubic foot
- pounds per square foot
17: All low-pressure chillers use which type of compressor?
- Reciprocating
- Scroll
- Centrifugal
- Rotary
18: The evaporator is a device to
- remove heat from the refrigeration system
- absorb heat into the refrigeration system
- store liquid refrigerant
- Keep the compressor busy
19: How many refrigerant classifications are there for flammability?
- 2
- 7
- 1
- 3
20: If the spring is adjusted to increase the superheat, this new setting will
- allow more liquid into the evaporator
- have no effect on the frost line
- shorten the frost line
- lengthen the frost line
21: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- strong solution
- absorbed solution
- concentrated solution
- weak solution
22: On cooling towers, what causes the condenser water to drop
- ambient temperatures
- tower fans
- evaporation of the water droplets
- sensible heat
23: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
24: What type of oil is used in R-410A systems?
- mineral oil
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene
25: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- release the charge when the pressure exceeds 310 psig or higher
- receive the pumpdown charge
- hold up to 110% of the pumpdown charge
- Pumpdown procedures are not allowed with systems containing liquid recievers