Topics: All categories in the pool
1: Ammonia is under what safety classification?
- B3
- B1
- B2
- A3
2: R-22 is considered a(n)
- HCFCH
- HFC
- CFC
- HCFC
3: Which is the lowest vacuum?
- 1,000 Microns
- 5" hg
- 10 psia
- 5 psig
4: 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
- lift voltage
- run voltage
- boost voltage
- pick-up voltage
5: Class T machine room
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall include closets used for setting equipment
- has no flame producing apparatus permanently installed
6: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
7: The evaporator is a device to
- remove heat from the refrigeration system
- Keep the compressor busy
- absorb heat into the refrigeration system
- store liquid refrigerant
8: The Board of Boilers adopts by reference
- MSCA Code
- Montreal Protocol Safety Code
- the MACS Pressure Vessel Code of Massachusetts
- the 1997 ANSI/ASHRAE Safety Code
9: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
10: Mercury was used in thermometers primarily because it
- was inexpensive
- expands uniformly
- vaporizes at very high temperatures
- never freezes
11: How much clearance do you need around the perimeter of electrical panels?
- 12"
- 18"
- 36"
- 24"
12: What is the amp draw of a 40 VA transformer at 24 volts
- 1.6 amps
- 1,000 amps
- 106 amps
- 1K amps
13: Relief valves are rated in
- pounds of air per minute
- gallons of water per minute
- gallons of water per hour
- pounds of air per hour
14: R22 and 410A operate at the same range of condensing and evaporating temperatures
- true
- false
15: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 14 days
- 30 days
- 2 months
- 1 week
16: Color is important in oil because
- it makes sight glasses easy to read
- allows you to see into crankcase
- it indicates the viscoisty.
- can tell us something about the refining of oil
17: An accumulator can be located between the
- evaporator and compressor
- compressor and condenser
- condenser and evaporator
- first stage and second stage compressors
18: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Air and dirt
- Water and soap
- Moisture and air
- Oil and water
19: What is used to check very low air pressures in air conditioning duct?
- Barometer
- Anemomter
- Manometer
- Vacuum gauge
20: A relief valve discharge capacity is rated in
- temperature minus pounds of air per second divided by release rate squared
- PSIG
- PSIA
- Pounds of air per minute.
21: Brazed joints melt at temperatures above
- 1,000F
- 800F
- 500F
- 1,200F
22: 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
23: A single pole-double throw switch used how many wires excluding the ground wire?
- three
- four
- two
- five
24: "I" represents _______ in the Watt's law formula.
- amperage
- reactance
- voltage
- watts
25: Which occupancy can ammonia be used in?
- redifential
- commercial
- industrial
- depends on the quantity of freon