Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Capacity control on an absorption system is typically accomplished by varying the

  • speed of the condenser water circulator pump
  • speed of the chilled water circulatory pump
  • rate at which heat is supplied to the generator
  • pressure setting on the system's rupture disc

2: It takes how many BTU/hr to melt one pound of ice at 32F

  • 970
  • 180
  • 144
  • 212

3: A professional or office building would be considered what type of occupancy?

  • business
  • public assembly
  • commercial
  • mercantile

4: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 1,000
  • 100
  • 10,000
  • 100,000

5: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 4%
  • 2%
  • 25%

6: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Moisture indicator
  • Foot valve
  • Stop valve
  • Muffler

7: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

8: Refrigerant restricted in 2004 but used for transition for decades:

  • R-22
  • R-123
  • R-134A
  • R-11

9: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • 2F difference
  • nearly the same
  • a ling psychrometer doesn't have two theremometers.
  • far apart or greater difference

10: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?

  • 40 uf
  • 25 uf
  • 15 uf
  • 20 uf

11: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 15 amps
  • 20 amps
  • 5 amps
  • 10 amps

12: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of low temperature evaporator
  • inlet of the low temperature evaporator.
  • outlet of the liquid line
  • outlet of high temperature evaporator

13: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

14: On a single phase motor, when does the start winding cut out?

  • Start windings do no cut-out of the run cycle
  • At 75% of its full rated speed
  • At 50% of its full rated speed
  • At 25% of its full rated speed

15: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

16: A direct system

  • is on where brine is cooled & circulated to the space refrigerated
  • is one which encloses a separate body of evaporative refrigerant
  • is a self-contained complete factory made and tested system
  • is where the refrigerant comes in contact with the space refrigerated

17: 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

  • pick up voltage
  • boost voltage
  • lift voltage
  • run voltage

18: The boiling point of a refrigerant is based on

  • Temperature
  • Heat content
  • a pressure-temperature relationship
  • None of the above.

19: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • strong solution
  • weak solution
  • absorbed solution
  • concentrated solution

20: A start capacitor is wired in _____ with the start windings.

  • series-parallel
  • junction
  • parallel
  • series

21: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 70.8 psig
  • 50.2 psig
  • 66.1 psig
  • 43.3 psig

22: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • over pressure protection and a rupture disc
  • over pressure protection
  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection as well as a temperature protection device

23: Gauge pressure is

  • Barometric pressure
  • Force of pressure above that of atmosphere
  • Atmospheric pressure
  • Absolute pressrue

24: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

25: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • lost heat
  • sensible heat
  • specific heat
  • latent heat