Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 226 psig, 68 psig
  • 257 psig, 77 psig
  • 365 psig, 120 psig
  • 455 psig, 185 psig.

2: What is the leaving chilled water set point for water chiller systems?

  • 45F
  • 55F
  • 66F
  • 38F

3: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • decreases
  • increases
  • run as designed with low ambient controls
  • doesn't change

4: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

5: The most common type of motor starter is

  • delts-wye starter
  • duel-winding starter
  • across the line starter
  • part winding starter

6: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • low head pressure
  • not enough oil in the system
  • oil in evaporator
  • moisture in the system

7: What is used to check very low pressure?

  • Hydrometer
  • Hygrometer
  • Manometer
  • Velometer

8: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

9: The color code of a tank of ammonia is

  • silver
  • lavender
  • white
  • light green

10: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

11: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs
  • shall use rupture discs or duel pressure relief valves
  • shall use pressure relief devices

12: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and friction head
  • GPM and unbalanced head and friction head
  • GPM and balanced head and friction head
  • GPM, pipe size, and equivalent head.

13: Where must a refrigeration contractor's license number be displayed?

  • Uniforms, checks, and invoices.
  • Truck, office, every job, and on all equipment
  • Trucks, license plates, and uniforms
  • Trucks, invoices, and advertising

14: Suction valve unloaders afford an effective means of

  • capacity control
  • refrigerant control
  • superheat control
  • evaporator control

15: A chiller entering and leaving temperature difference is?

  • 50 degrees F
  • 10 degrees F
  • 5 degrees F
  • 20 degrees F

16: Usually dry bulb temperature is

  • not important and shall be ignored
  • same as wet bulb temperature
  • higher than wet bulb temperature
  • lower than dry bulb temperature

17: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

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

18: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-2
  • B-2
  • A-1
  • B-1

19: Capacitors are rated in

  • volt - amperes
  • kelvins
  • micro-farads
  • megaohms

20: A start capacitor in series with a start winding will

  • increase starting torque
  • decrease the amp draw of the motor
  • increase running efficiency
  • increase the amp draw of the motor

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

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

22: Refrigeration piping before being buried shall be

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

23: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Suction and discharge valves
  • Nesting scrolls
  • Fan-like action
  • Rotating vanes

24: On a TXV, the purpose of an external equalizer is to?

  • balance the evaporator load
  • allow a greater adjustment spam
  • Increase the pressure on the top of the power head diaphragm
  • compensate for a pressure drop across the evaporator coil

25: Gauge pressure is

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