Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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?

  • 88
  • 96
  • 38
  • 58

2: A High-Probability System

  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that a leak of refrigerant from a failed connection will enter an unoccupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space

3: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and solution will crystallize
  • The machine will cool excessively as the solution evaporates
  • The machine will cool excessively as the solution crystallizes.
  • The machine will stop cooling and the solution will evaporate.

4: Suction line oil traps should be installed when the condenser is

  • more than 100' away from the evaporator
  • on the third floor roof and the evaporator is in the basement
  • located outside the operates in temperatures below 35F
  • in the basement and the evaporator is on the third floor

5: Low pressure chiller systems use what type of compressor?

  • Screw
  • Reciprocating
  • Scroll
  • Centrifugal

6: Brazed joints melt at temperatures above

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

7: The proper location for an oil separator is between the

  • evaporator and compressor
  • receiver and metering device
  • condenser and receiver
  • compressor and condenser

8: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

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

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

10: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low pressure chillers do not have purge units
  • increased capacity
  • low suction pressure
  • high head pressure

11: All electrical work done on refrigeration systems must comply with

  • NEC and Massachusetts Modifications
  • ASHREA-15 Section 9.2.1
  • OSHA
  • Department of Energy

12: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Stop valve
  • Muffler
  • Foot valve
  • Moisture indicator

13: One ton of refrigeration is defined as ______ btu/minute.

  • 12,000
  • 720,000
  • 200
  • 60

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

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

15: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 800F
  • 700F
  • 600F
  • 1000F

16: What is the state of the refrigerant leaving the evaporator?

  • low temperature superheated vapor
  • a high temperature subcooled liquid
  • a low temperature subcooled liquid
  • a high temperature superheated vapor

17: Booster compressors connect to the ____ side of the compressor

  • vapor
  • low side
  • oil side
  • liquid

18: 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
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • high and low pressure controls

19: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

20: Which refrigerant replaced R-12?

  • R-22
  • R-410A
  • R-134A
  • R-407A

21: Megaohm meters can detect a ground in the

  • up to 10,000 ohms
  • up to 1,000,000 ohms
  • up to 1,000 ohms
  • 10,000,000 ohms or higher

22: What is a Category "M" fluid?

  • 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 typical refrigerant used on newer air conditioning and heat pump systems
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
  • Any fluid that exceeds 150 psig and has design temperatures over 366F

23: On a TXV, the purpose of an external equalizer is to?

  • allow a greater adjustment spam
  • Increase the pressure on the top of the power head diaphragm
  • balance the evaporator load
  • compensate for a pressure drop across the evaporator coil

24: A moisture indicator must

  • be filled with liquid
  • be sight side up
  • change color when exposed to moisture
  • be yellow

25: Volts x amps equals

  • Inductance
  • Watts
  • Impedance
  • Ohms Law