Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which of the following is an inorganic refrigerant?

  • R-22
  • Ammonia
  • Chlorofluorocarbons
  • All of the above

2: Relief valves are rated in

  • gallons of water per hour
  • pounds of air per hour
  • gallons of water per minute
  • pounds of air per minute

3: A movie theater would be considered a

  • institutional occupancy
  • mixed occupancy
  • commercial occupancy
  • public assembly occupancy

4: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

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

  • B-1
  • A-1
  • B-2
  • A-2

6: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?

  • Pressure induced displacement.
  • Positive displacement
  • Low Pressure displacement
  • Non-positive displacement

7: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

8: Give an example of a secondary coolant?

  • R-12
  • R-410A
  • R-717
  • R-718

9: A water regulating valve opens when

  • when the power is on there is an overcharge of refrigerant
  • when the power is on
  • the head pressure rises
  • the compressor is on

10: Control systems can be classified by

  • tonnage of system
  • safety
  • economy of operation
  • source of power

11: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are

  • gate or globe valves
  • companion or block valves
  • ball valves
  • king valves

12: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • red
  • blue
  • orange
  • green

13: Excessive head pressure is often caused by

  • insufficient refrigerant
  • leaking reed valve on the discharge side
  • air cooled condenser is plugged
  • thermostat set too high

14: How many different groups of refrigerants are there?

  • 15
  • 11
  • 7
  • 3

15: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

16: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • outside the machinery room
  • evaporator
  • boiler
  • compressor

17: In a motor, an internal overload might open if

  • there's an open start winding
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's a direct short
  • there's an excess current draw through the motor

18: A solder joint melts at temperatures of

  • 400F to 800F
  • 1,200F to 1,500F
  • 600F to 900F
  • less than 400F

19: A capacitor in series with the start windings will do what?

  • Increase starting torque
  • Nothing
  • Decrease the RLA to within 10% of its rating
  • Increase run efficiency by 10% of its rating

20: Adjusting the spring pressure on a TXV

  • changes superheat
  • changes subcooling
  • makes no difference
  • adjusts the bulb charge

21: When an electronic bridge is in balance the bridge output will be

  • 15 volts
  • 0 volts
  • 1 volt
  • .01 volts

22: R-123 belongs to Group

  • B-3
  • A-3
  • B-2
  • B-1

23: What is used to check very low pressure?

  • Manometer
  • Hygrometer
  • Hydrometer
  • Velometer

24: The high side float assembly meters refrigerant into the evaporator through the

  • lower chamber of the high side
  • upper chamber of the low side
  • lower chamber of the low side
  • upper chamber of the high side

25: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms

  • 24.0 volts
  • 2.40 volts
  • 240 volts
  • 2,400 volts