Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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 unoccupied 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 occupied space

2: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

3: 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

4: What type of pressure relief device is used on a CO2 system?

  • Glove valve
  • Gate valve
  • Fusible plug
  • Rupture disk

5: 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?

  • Water and soap
  • Moisture and air
  • Air and dirt
  • Oil and water

6: The best way to detect ammonia in brine is

  • CO2 gas
  • carbonation of soda
  • potassium of line
  • nessler regaent

7: The two float-type metering devices are the

  • high-side float and the low-side float
  • vapor float and the low-side float.
  • liquid float and the vapor float
  • liquid float and the low-side float

8: What is the purpose of a surge capacitor on a contactor?

  • to keep the contactor pulled in
  • to protect low voltage equipment
  • to balance the sine waves
  • to provide smoother start/stops

9: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 88
  • 38
  • 58
  • 96

10: By using nitrogen within a pipe during brazing operation,

  • Copper oxide formation is prevented
  • The explosion hazard is confined
  • Discoloration is prevented
  • Exterior scale formation is minimized

11: Pi equals approximately

  • 3.41
  • 12,000
  • 746
  • 3.14

12: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

13: What is potential measured in?

  • Volts
  • Henrys
  • Amps
  • Ohms

14: What is the voltage of each leg of a 480 Volt three-phase motor?

  • 240v
  • 277v
  • 120v
  • 208v

15: While the system is operating, the discharge line should be

  • at the same temperature as the crankcase
  • room temperature
  • 10-15F warmer than ambient
  • too hot to hold by hand

16: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

17: Ohm's Law indicates Amps X Resistance = ___________.

  • Current
  • Volts
  • Ohms
  • Impedance

18: Where is the high-side float located on a chiller system?

  • discharge line
  • liquid line
  • inside the chiller barrel
  • flash line

19: A EPR valve is installed on what type of evaporators?

  • high-temperature evaporators
  • low-temperature evaporators
  • plate evaporators
  • shell and tube evaporators

20: A split-phase motor has a ______ winding and a ____ winding

  • start, common
  • run, start
  • duel-run, duel-start
  • run, common

21: Name a reason that does not cause reduced condenser air quantity

  • Prevailing winds
  • Dirty Coil
  • Dirty fan blades
  • High ambient temperature

22: What refrigerant is an inorganic compound?

  • Ammonia
  • R-132A
  • R-22
  • R-410A

23: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

24: 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

25: R-22 falls under which safety classification?

  • A-1
  • A-2
  • B-2
  • B-1