Topics: All categories in the pool
1: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
2: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 75%
- 100%
- 90%
- 80%
3: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 600 watts
- 5KW
- 1000 watts
- 746 watts
4: Name three things that must be done when changing refrigeration lubricant?
- You can't change lubricants.
- Nothing must be done
- Place sign, check for leaks, insulate
- Make sure it's compatible, notify owner, notify AHJ
5: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 977.6 watts
- 9.776 watts
- 9,776 watts
- .9776 watts
6: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- purge
- surge
- splurge
- merge
7: Capacitors are rated in
- kelvins
- micro-farads
- megaohms
- volt - amperes
8: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
9: Usually dry bulb temperature is
- lower than dry bulb temperature
- higher than wet bulb temperature
- same as wet bulb temperature
- not important and shall be ignored
10: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- rupture plug
- fusion plug
- fusible plug
- relief plug
11: 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
12: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 1.5
- 1.2
- 2.2
13: Suction valve unloaders afford an effective means of
- evaporator control
- superheat control
- refrigerant control
- capacity control
14: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- it shall be approved by the owner for proper operation.
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
15: Can ammonia be used on domestic system?
- yes
- no
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
16: All serviceable components of a refrigeration system shall be provided with
- service manuals
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- safe access
- manufactures instructions on start-up procedures
17: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- king valves
- gate or globe valves
- ball valves
18: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
19: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 18
- 15
- 24
20: Large mercantile occupancy is
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
21: What refrigerant doesn't have to be classifted?
- R-718
- R-711
- R-717
- R-134a
22: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
23: A High-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
24: What type of material can't be used on the outlet of a relief valve?
- Magnesium alloy
- PVC
- Copper
- Stainless steel
25: What refrigerant were phased out in 2004?
- R-12
- R-134a
- R-11
- R-22