Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is the refrigerant dichlorodifluoromethane?

  • R-12
  • R-123
  • R-134A
  • R-22

2: R-22 falls under which safety classification?

  • B-2
  • A-1
  • A-2
  • B-1

3: The evaporator is a device to

  • remove heat from the refrigeration system
  • Keep the compressor busy
  • store liquid refrigerant
  • absorb heat into the refrigeration system

4: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • Machinery rooms need not be vented
  • the return air ducted system
  • the mechanical room housing the refrigeration system
  • the outdoors

5: Usually dry bulb temperature is

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

6: How are safety controls wired in a circuit?

  • Either series or parallel
  • Parallel
  • Series/parallel
  • Series

7: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?

  • 40 uf
  • 15 uf
  • 20 uf
  • 25 uf

8: Each machinery room shall contain

  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • high and low pressure controls
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate

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

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

10: 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

11: What is a Category "M" fluid?

  • Any fluid that exceeds 150 psig and has design temperatures over 366F
  • A typical refrigerant used on newer air conditioning and heat pump systems
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content

12: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of high temperature evaporator
  • outlet of the liquid line
  • outlet of low temperature evaporator
  • inlet of the low temperature evaporator.

13: What is the refrigerant chlorodifluoromethane?

  • R-134a
  • R-22
  • R-12
  • R-123

14: 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.
  • it shall not be operated below prescribed pressures
  • the form of certificate shall be authorized by the Department of Pubic safety

15: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Saturated temperature
  • Critical temperature
  • Wet bulb temperature
  • Dry bulb temperature

16: What is R-611?

  • Propane
  • Hydrochlorophine
  • Methyl Formate
  • Methyl Chloride

17: What is the boiling point of refrigerant governed by?

  • Compressor RPM's
  • P&T relationship
  • Evaporator temperature
  • Condenser sub-cooling

18: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

19: R-12 is

  • dichloromethane
  • dichlorofluoromethane
  • trichlorofluoromethane
  • dichlorodifluoromethane

20: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 2.2
  • 1.2
  • 1
  • 1.5

21: R-11 belongs to Group

  • B-1
  • A-1
  • A-2
  • B-3

22: Which creates more of a heat load?

  • 90% RH
  • 30% RH
  • 70% RH
  • 50% RH

23: A direct system

  • is one which encloses a separate body of evaporative refrigerant
  • is a self-contained complete factory made and tested system
  • is where the refrigerant comes in contact with the space refrigerated
  • is on where brine is cooled & circulated to the space refrigerated

24: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

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

25: What section governs pressure vessels?

  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34
  • OSHA
  • Section 8 ASHREA 15 ASME unfired