Topics: All categories in the pool
1: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- sight glass, weight, pressure, and frost line
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, pressure, and dipstick
- sight glass, weight, paper method, and frost line.
2: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
3: Ammonia systems use ____ pressure to adjust oil pressure
- air
- discharge
- liquid
- stream
4: Indirect systems using Group II refrigerants
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system less than 1,000 lbs
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
5: Capacitors are rated in
- megaohms
- volt - amperes
- micro-farads
- kelvins
6: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Insulated and installed in a pipe duct (Encased)
- Leak checked
- Classifed
- Certified
7: Which refrigerant is lighter than air?
- R-11
- R-123
- R-134a
- R-717
8: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- ammonia
- CFC-11
- Lithium bromide
- HCFC-123
9: What refrigerant were phased out in 2004?
- R-12
- R-134a
- R-22
- R-11
10: Color is important in oil because
- it makes sight glasses easy to read
- can tell us something about the refining of oil
- allows you to see into crankcase
- it indicates the viscoisty.
11: How many BTU's is produced by one watt of energy
- 2.57
- 3.00
- 1
- 3.41
12: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
13: What does safe access mean?
- Locked doors
- OSHA approved
- Well-lit exit signs
- A clear unobstructed path to the equipment and controls
14: What are the three components of a transformer?
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and copper contacts
- Contacts, secondary coil, and core
15: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 60% Li-Br, 40% distilled water
- 40% Li-Br, 60% distilled water
- 40% Li-Br, 60% tap water
- 50% Li-Br, 50% tap water
16: Which refrigerant class listed below is the most flammable?
- C-3
- A-3
- B-2
- A-1
17: Increasing superheat will do what to your system?
- Decrease liquid flow
- Increase liquid flow
- Increase gas flow
- Nothing
18: A High-Probablity system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is a system highly likely to leak from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
19: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Copper
- Aluminum
- Magnesium alloy
20: "R" represents ___ in the Ohm's law formula
- amperage
- resistance
- voltage
- capacitance
21: The proper location for an oil separator is between the
- receiver and metering device
- compressor and condenser
- condenser and receiver
- evaporator and compressor
22: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
23: On a single phase motor, when does the start winding cut out?
- 100% of its RLA speed
- 25% of its RLA speed
- 75% of its RLA speed
- 50% of its RLA speed
24: Joints in refrigeration piping must be _____ before being covered?
- Pressurized
- Inspected
- Insulated
- Leak tested
25: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above