Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 36
  • 48
  • 18
  • 24

2: one BTU equals

  • 31.4 hp
  • 12,000 hp
  • 3.41 hp
  • Pi

3: System design pressures must take into consideration, not only, pressures found during normal operation but also what?

  • When it's cold out
  • When there is a malfunction on the high side
  • When its warm out
  • All of the above

4: What is an example of institutional occupancy?

  • Hospital
  • Football stadium
  • Dorms
  • Shopping mall

5: 1 HP = ____ Watts?

  • 3,412
  • 3.1416
  • 746
  • 11,239

6: Which oil is hydoscopic?

  • SW30
  • polyolester
  • animal
  • mineral

7: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

8: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

9: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • strong solution
  • diluted solution
  • absorbed solution
  • weak solution

10: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Heat
  • Electricity
  • Oil
  • Air

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

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

12: If your suction line is warmer than the room temperature, this may indicate

  • below normal superheat
  • plugged air filter
  • a low charge
  • an over charge

13: Halogen refrigerants are corrosive to which type of metal?

  • copper
  • magnesium
  • black iron
  • stainless steel

14: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 25
  • 20
  • 15
  • 10

15: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

16: 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

17: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • there is no Group B1 refrigerants
  • higher
  • lower
  • the same

18: What is the state of the refrigerant leaving the evaporator?

  • a high temperature superheated vapor
  • a low temperature subcooled liquid
  • a high temperature subcooled liquid
  • low temperature superheated vapor

19: What is the refrigerant dichlorodifluoromethane?

  • R-12
  • R-134A
  • R-123
  • R-22

20: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat lost by the medium being cooled
  • the heat gained by the condenser
  • the heat of compression

21: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

22: The evaporator is a device to

  • store liquid refrigerant
  • absorb heat into the refrigeration system
  • Keep the compressor busy
  • remove heat from the refrigeration system

23: R-123 belongs to Group

  • B-2
  • B-3
  • B-1
  • A-3

24: What would be the classification of a church?

  • Institutional
  • Industrial
  • Place of assembly
  • Large mercantile

25: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • hold up to 110% of the pumpdown charge
  • release the charge when the pressure exceeds 310 psig or higher
  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • receive the pumpdown charge