Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: On cooling towers, what causes the condenser water to drop

  • sensible heat
  • evaporation of the water droplets
  • tower fans
  • ambient temperatures

3: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 746 watts
  • 5KW
  • 600 watts
  • 1000 watts

4: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

5: A secondary coolant is defined as

  • any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
  • a low temperature refrigerant used for cascading systems
  • any refrigerant direcly in contact with the cooling space for process cooling
  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.

6: At higher altitudes, boiling temperatures

  • increase
  • are unaffected
  • depends on the refrigerant
  • decrease

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

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

8: Thermodynamics is the branch of science that deals with

  • molecular therory
  • energy due to motion
  • heat energy
  • state of energy

9: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • the vapor side of the system
  • high side of the system
  • the liquid side of the system
  • low side of the system

10: What is the minimum height refrigeration piping should be placed against walls?

  • 72"
  • 7.25'
  • 6'
  • Ceiling height

11: Capacitors are rated in

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

12: Class T machine room

  • shall include closets used for setting equipment
  • has no flame producing apparatus permanently installed
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall have refrigerant leak detecting systems installed inside and outside the room

13: Brazed joints melt at temperatures above

  • 500F
  • 1,200F
  • 800F
  • 1,000F

14: Crankcase heaters are energized

  • while the compressor is running
  • to prevent compressor freeze-up
  • when the compressor is off
  • to allow easy compressor start-up

15: 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?

  • 96
  • 38
  • 88
  • 58

16: The critical temperature of a refrigerant gas occurs when

  • any increase in pressure will not liquefy the gas
  • any decrease in pressure will cause condensation
  • the gas returns to a liquid
  • the gas is no longer saturated

17: E = I X R is

  • Watts Law
  • Ohms Law
  • Amps Law
  • Impedance Law

18: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • of Group B2 refrigerant shall be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • shall not be prohibited
  • shall be prohibited

19: Evaporators within 18" of a heating coil must be equipped with a

  • high limit control
  • zone valve
  • pressure relief device
  • low limit control

20: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 88
  • 38
  • 108
  • 116

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

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

22: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 20'
  • There is no minimum for relief valve and windows.
  • At least 40'
  • At least 30'

23: "P" represents ______ in the Watt's law formula

  • voltage
  • watts
  • reactance
  • amperage

24: What is the amp draw of a 40 VA transformer at 24 volts

  • 1,000 amps
  • 1K amps
  • 106 amps
  • 1.6 amps

25: "E" references ____ in the Ohm's law formula

  • resistance
  • amperage
  • capacitance
  • voltage