Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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.

  • 20
  • 10
  • 15
  • 25

2: A relief valve shall be located at least ___ above grade.

  • 25'
  • 10'
  • 15'
  • 36'

3: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • are obsolete.
  • True
  • False
  • depends on the type of refrigerant being used

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

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

5: Capacitors are rated in

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

6: Which is the lowest vacuum?

  • 1,000 Microns
  • 5 psig
  • 10 psia
  • 5" hg

7: What pipe can not be used for refrigeration?

  • L
  • K
  • M
  • N

8: On a pumpdown system, the liquid-line solenoid is controlled by the

  • defrost timer
  • thermostat
  • low pressure switch
  • low-ambient controller

9: On a large centrifugal system, what meters the flow to the evaporator?

  • TXV
  • Low side float
  • High side float
  • Cap tube.

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

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

11: Ohm's Law indicates Amps X Resistance = ___________.

  • Volts
  • Ohms
  • Current
  • Impedance

12: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Adiabatic
  • Volume Temperature
  • Pressure Temperature
  • Isothermal

13: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • regularly
  • annually
  • quarterly
  • bi-annually

14: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-22
  • R-11
  • R-12
  • R-113

15: A high side float is a

  • float type valve that controls the crankcase oil level
  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type switch that stops the compressor when the pressure on the high side becomes too high
  • float type valve that controls the amount of refrigerant stored in the receiver

16: "R" represents ___ in the Ohm's law formula

  • voltage
  • capacitance
  • resistance
  • amperage

17: 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

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

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

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

  • 180
  • 970
  • 144
  • 212

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

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

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

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

22: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 257 psig, 77 psig
  • 226 psig, 68 psig
  • 350 psig, 120 psig
  • 455 psig, 185 psig

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

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

24: What must be done if refrigeration lines pass through a concrete floor?

  • insulated
  • installed through a pipe casing
  • moisture barrier
  • leak checked

25: If the spring is adjusted to increase the superheat, this new setting will

  • shorten the frost line
  • lengthen the frost line
  • allow more liquid into the evaporator
  • have no effect on the frost line