Topics: All categories in the pool
1: A capacitor in series with the start windings will do what?
- Decrease the RLA to within 10% of its rating
- Nothing
- Increase starting torque
- Increase run efficiency by 10% of its rating
2: What kind of material can't be used on the outlet of a relief valve?
- PVC
- Aluminum
- Stainless Steel
- Copper
3: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
4: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
5: Setting a pressure relief device shall not exceed ___ of the design pressure
- 100%
- 80%
- 75%
- 90%
6: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- compressor
- evaporator
- outside the machinery room
- boiler
7: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
8: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
9: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
10: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
11: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- sight glass, weight, paper method, and frost line.
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, pressure, and dipstick
- sight glass, weight, pressure, and frost line
12: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
13: What instrument is used to measure very high resistance?
- voltmeter
- tape measure
- ammeter
- meg ohmmeter
14: What are the three components of a transformer?
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
- Contacts, secondary coil, and core
15: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 22
- 18
- 50
16: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-11
- Flush with RX-11
- Flush with R-718
- Flush with ammonia
17: 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
18: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
19: 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
- HCFC-123
- Lithium bromide
20: The difference between saturated liquid and saturated vapor is
- temperature
- volume
- pressure
- heat
21: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
22: A direct system
- is one which encloses a separate body of evaporative refrigerant
- is where the refrigerant comes in contact with the space refrigerated
- is a self-contained complete factory made and tested system
- is on where brine is cooled & circulated to the space refrigerated
23: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs.
- 550 lbs
- 660 lbs
- 55 lbs
24: How many groups of refrigerants are there?
- 5
- 3
- 7
- 1
25: Can you use Ammonia in industrial applications?
- No, never
- Yes, always
- When mixed with R-718
- Yes, Under certain condidtions