Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • 25
  • 15
  • 10
  • III

2: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 327 psig
  • 365 psig
  • 255 psig
  • 125 psig

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

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

4: High pressure controls should be set no higher than

  • 10% of set point
  • 25% of set point
  • 80% of set point
  • 90% of set point

5: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • volute
  • nozzle
  • suction
  • baffle

6: At higher altitudes, the boiling point of refrigerant is

  • equal to the coefficient of water at 32F
  • the same
  • lower
  • higher

7: What type of voltage causes the winding in a potential relay to open?

  • BEMF (Back Electro-Motive Force)
  • 24V control voltage from the thermostat
  • 120V line voltage
  • None of the above

8: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

9: The measurement of heat in a particular substance is

  • sensible heat
  • enthalpy
  • latent heat
  • specific heat

10: When must refrigeration system covered by the code be inspected?

  • Upon installation
  • Annually and when installed
  • Annually
  • Not required

11: A micron is

  • one thousandths of a millimeter
  • one millonths of a micrometer
  • one millonths of a centimeter
  • a larger unit of measurement than Hg

12: If the suction pressure is low and the evaporator temperature high, the cause will be a?

  • overcharged
  • starved evaporator
  • too small evaporator
  • compressor suction valve stuck open

13: Low ambient controls are used when

  • economizers are used
  • always
  • on air conditioning systems only
  • when systems run all year round

14: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • centrifugal switch
  • printed circuit board (PCB)
  • motor starter
  • duel-voltage switch

15: Pi equals approximately

  • 3.41
  • 3.14
  • 12,000
  • 746

16: Volts x amps equals

  • Watts
  • Ohms Law
  • Impedance
  • Inductance

17: Which of the following is an inorganic refrigerant?

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

18: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

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

  • A-1
  • B-2
  • B-1
  • A-2

20: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code

  • licensed welder
  • welder qualified
  • competent welder
  • licensed technician

21: 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?

  • 38
  • 96
  • 88
  • 58

22: When a refrigeration or air conditioning system is installed

  • a field inspection shall be made before it is put into service
  • it shall be approved by the owner for proper operation.
  • the form of certificate shall be authorized by the Department of Pubic safety
  • it shall not be operated below prescribed pressures

23: When using nitrogen for brazing, the pressure should be:

  • 125 psig
  • Very low
  • 50-100 psig
  • Slightly below atmospheric

24: 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

25: What is potential measured in?

  • Amps
  • Volts
  • Henrys
  • Ohms