Topics: All categories in the pool
1: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- filter out impurities from the system
- store excess refrigerant from the reciver
- reduce friction loss to the flow of refrigerant
2: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
3: What is the maximum voltage range allowed on an electrical circuit?
- 15%
- 20%
- 5%
- 10%
4: Before replacing a seized compressor, the _______ should be determinded.
- type of refrigerant
- current draw
- cause of seizure
- designed head pressure
5: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-113
- R-22
- R-12
6: Start to Run windings will have what resistance?
- The most resistance value
- The least resistance value
- All will be at equal values
- Somewhere between the actual start winding and run winding resistance value
7: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
8: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
- shall have a pressure limiting device and a pressure relief valve installed
9: Viscosity is
- a measure of heat content
- the coefficient of external friction
- the ability of oil to flow
- measure of weight
10: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
- Notify the Fire Marshal that the system has been inspected and approved
- Notify the AHJ to let them know that the system been inspected
11: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
12: The best way to determine the voltage requirement for an electrical component is to
- read the voltage with a mulitmeter
- read the nameplate data
- check with the utility company
- determine the capacity of the service panel
13: Which refrigerant is lighter than air?
- R-11
- R-134a
- R-717
- R-123
14: How many flammability classifications are refrigerants in?
- 2
- 5
- 7
- 3
15: What instrument is used to measure very high resistance?
- voltmeter
- meg ohmmeter
- ammeter
- tape measure
16: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
17: What pipe can not be used for refrigeration?
- M
- K
- N
- L
18: Which of the following controllers would you expect to be most sensitive to temperature changes?
- immersion controller
- aquastat
- line voltage t-stat
- low voltage t-stat
19: When should a relief valve start to function?
- Before the purge station discharges
- At it's set pressure
- 10 psi before it's set pressure
- Two times it's working pressure
20: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 90
- 100
- 110
- 80
21: The two float-type metering devices are the
- liquid float and the vapor float
- vapor float and the low-side float.
- high-side float and the low-side float
- liquid float and the low-side float
22: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Aluminum
- Copper
- Stainless steel
23: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- pick-up voltage
- lift voltage
- boost voltage
- run voltage
24: 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
25: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 660 lbs
- 550 lbs
- 330 lbs.