Refrigerant Machine Operator Test #2

100 Questions | Total Attempts: 8473

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Refrigerant Machine Operator Test #2

Incase you are a refrigerant machine operator and are in need of brushing up your knowledge and comprehension of this job then this is the quiz for you. It is designed to gauge how much you know.


Questions and Answers
  • 1. 
    OF THE FOLLOWING CHARACTERISTICS OF REFRIGERANT, THE ONE THAT BEST DESCRIBES REFRIGERANT 22 IS:
    • A. 

      ODORLESS WHEN MIXED WITH AIR

    • B. 

      AN ETHER LIKE ODOR WHEN MIXED WITH AIR

    • C. 

      EXPLOSIVE WHEN MIXED WITH AIR

    • D. 

      BOILS AT HIGHER TEMP THAT R-12

  • 2. 
    BECAUSE OF THE LATENT HEAT LOAD, REFRIGERATION MACHINE OPERATOR WAS INSTRUCTED TO START THE RECIPROCATING PLANT FOR AIR CONDITIONING.  OF THE FOLLOWING ACCORDING TO RECOMMENDED PRACTICE, THE FIRST THING TO DO IS
    • A. 

      TURN ON CHILLED WATER PUMPS AND OPEN THE BYPASS TO LIGHTER LOAD

    • B. 

      INSTALL LARGER FUSE TO TAKE THE INITIAL LOAD, AND THEN TURN ON THE COOLING TOWER FANS

    • C. 

      TURN ON CHILLED WATER PUMP, CONDENSER WATER PUMPS AND COOLING TOWER FANS

    • D. 

      SET THE THERMOSTAT A FEW DEGREES HIGHER

  • 3. 
    THE MOST IMPORTANT REASON TO USE 2 COMPRESSORS IN A CASCADE SYSTEM IS TO:
    • A. 

      ACCOMPLISH LOWER TEMPERATURE

    • B. 

      PERMIT THE USE OF INEXPENSIVE LUBRICATING OIL

    • C. 

      AVOID THE NEED FOR VERY HIGH COMPRESSION RATIOS

    • D. 

      DIVIDE THE COOLING LOAD BETWEEN 2 COMPRESSORS

  • 4. 
    THE ADVANTAGE OF FORCED DRAFT OVER NATURAL DRAFT COOLING TOWER IS:
    • A. 

      THE POSSIBILITY OF LOWER WATER OUT TEMP

    • B. 

      THERE IS NO DEPENDENCE ON NATURAL WIND VELOCITY

    • C. 

      USE OF A SMALLER TOWER SIZE

    • D. 

      ALL OF THE ABOVE

  • 5. 
    WHAT IS 29.92" HG IN KPA
    • A. 

      101.3

    • B. 

      101.28

    • C. 

      101.26

    • D. 

      103.2

  • 6. 
    THE MECHANISM SITTING ABOVE THE EVAPORATOR IS KNOWN AS
    • A. 

      ECONOMIZER

    • B. 

      PURGE UNIT

    • C. 

      AIR BLEED

    • D. 

      PRESSURE RELIEF VALVE

  • 7. 
    THE RUPTURE DISK IS ALWAYS PIPED INTO THE
    • A. 

      HIGH SIDE

    • B. 

      LOW SIDE

    • C. 

      EITHER SIDE OF SYSTEM

    • D. 

      NEITHER SIDE SYSTEM

  • 8. 
    CONCERNING LEAKAGE, WHICH STATEMENT IS MOST CORRECT?
    • A. 

      GATE VALVE CAUSES LESS LEAKAGE

    • B. 

      GLOBE VALVES CAUSES MORE LEAKAGE

    • C. 

      ALL VALVES ARE THE SAME

    • D. 

      GATE VALVES CAUSES MORE LEAKAGE

  • 9. 
    WHAT SHAFT SEAL PREVENTS VAPOR FROM LEAKING OUT OF COMPRESSOR?
    • A. 

      STUFFING BOX

    • B. 

      ELECTRO-MECHANICAL SEAL

    • C. 

      MECHANICAL SEAL

    • D. 

      ALL OF THE ABOVE

  • 10. 
    A FUSIBLE PLUG MELTS AT
    • A. 

      450°F

    • B. 

      280°F

    • C. 

      212°F

    • D. 

      800°F

  • 11. 
    WHEN WILL THE BTUs ABSORBED BY THE CONDENSING WATER BE THE GREATEST?
    • A. 

      LOW CONDENSER TEMPERATURE, LOW CONDENSER WATER TEMPERATURE

    • B. 

      HIGH CONDENSER TEMPERATURE, HIGH CONDENSER WATER TEMPERATURE

    • C. 

      HIGH CONDENSER TEMPERATURE, LOW CONDENSER WATER TEMPERATURE

    • D. 

      LOW CONDENSER TEMPERATURE, HIGH CONDENSER WATER TEMPERATURE

  • 12. 
    FLOODED EVAPORATORS HAVE HIGH HEAT TRANSFER PER SQUARE FOOT, WHAT MAY BE A DISADVANTAGE?
    • A. 

      REQUIRES A SMALLER CHARGE

    • B. 

      REQUIRES A HIGHER CHARGE

    • C. 

      REQUIRES A USE OF A TXV FOR PROPER FEED

    • D. 

      WATER HAS TO BE DRAINED DAILY

  • 13. 
    SHELL AND TUBE CONDENSERS HAVE THE ADVANTAGE OF:
    • A. 

      REMOVING HEADS FOR CLEANING THE WATER SIDES OF THE TUBES

    • B. 

      THE REFRIGERANT CONNECTIONS DOES NOT HAVE TO BE DISRUPTED

    • C. 

      USING ACID FOR CLEANING

    • D. 

      BOTH A AND B ARE CORRECT

  • 14. 
    SHELL AND COIL CONDENSERS HAVE THE ADVANTAGE OF:
    • A. 

      REMOVING HEADS FOR CLEANING THE WATER SIDES OF THE TUBES

    • B. 

      THE REFRIGERANT CONNECTIONS DO NOT HAVE TO BE DISRUPTED

    • C. 

      HAS LESS CHANCE OF DEVELOPING LEAKS

    • D. 

      BOTH A AND B ARE CORRECT

  • 15. 
    HOW MANY BTUs WOULD BE REMOVED IN A 30 TON SYSTEM?
    • A. 

      12,000 PER HOUR

    • B. 

      360,000 PER MINUTE

    • C. 

      12,000 PER MINUTE

    • D. 

      360,000 PER HOUR

  • 16. 
    IF YOU HAVE 62 PSI AT 35°F AND 70 PSI AT 45°F, WHAT WOULD 38°F BE?
    • A. 

      66

    • B. 

      64.4

    • C. 

      65

    • D. 

      62

  • 17. 
    COPPER USED IN REFRIGERATION SYSTEMS, LIKE IN HEAT EXCHANGERS, BECAUSE?
    • A. 

      EASY FABRICATION

    • B. 

      EASY DURABILITY

    • C. 

      HIGH THERMAL CONDUCTIVITY

    • D. 

      FLEXIBILITY

  • 18. 
    THE ACCESSORIES ON THE LIQUID LINE ARE IN WHAT ORDER?
    • A. 

      SOLENOID VALVE, DRIER, AND SIGHT-GLASS

    • B. 

      RECEIVER, DRIER, SOLENOID VALVE, AND SIGHT-GLASS

    • C. 

      MUFFLER, DRIER, SIGHT-GLASS AND SOLENOID VALVE

    • D. 

      ACCUMULATOR, MUFFLER, DRIER, SIGHT-GLASS

  • 19. 
    A CONDENSER IS 20' LONG AND 6' IN DIAMETER, WHAT IS THE VOLUME IN GALLONS IF 7.48 GALLONS IS 1 CU/FT?
    • A. 

      565

    • B. 

      4227

    • C. 

      1808

    • D. 

      1205

  • 20. 
    WHAT IS THIS USED FOR?
    • A. 

      RECYCLING

    • B. 

      RECOVERY

    • C. 

      RECLAIMING

    • D. 

      PURGING

  • 21. 
    IF THE LOW PRESSURE CUTOUT CYCLES THE COMPRESSOR OFF, WHAT STARTS THE COMPRESSOR AGAIN?
    • A. 

      SOLENOID VALVE

    • B. 

      HIGH PRESSURE CUT OUT

    • C. 

      LOW PRESSURE CUT OUT

    • D. 

      THERMOSTAT

  • 22. 
    REMOVING THE INSULATION ON THE SUCTION LINE, WITH THE ENGINE TEMPERATURE AT 85°F, WHAT WILL OCCUR?
    • A. 

      FLOODED EVAPORATOR

    • B. 

      STARVED EVAPORATOR

    • C. 

      EXCESSIVE SUPERHEAT

    • D. 

      LOW SUPERHEAT

  • 23. 
    IF YOU WERE RUNNING THREE COMPRESSORS, WHICH BEST DESCRIBES THE STATE OF REFRIGERANT LEAVING THE THIRD EVAPORATOR COIL?
    • A. 

      MOSTLY LIQUID, SOME VAPOR

    • B. 

      MOSTLY VAPOR, SOME LIQUID

    • C. 

      SUPERHEATED VAPOR

    • D. 

      HIGHLY SUPERHEATED VAPOR

  • 24. 
    WHAT TYPE OF PUMP IS THIS?
    • A. 

      CENTRIFUGAL CHILLED WATER PUMP

    • B. 

      RECIPROCATING CONDENSER WATER PUMP

    • C. 

      RECIPROCATING CHILLED WATER PUMP

    • D. 

      CENTRIFUGAL CONDENSER WATER PUMP

  • 25. 
    AN ELECTRIC MOTOR THAT IS RATED AT 3 HP WILL?
    • A. 

      USE THREE PHASE

    • B. 

      NEED A CAPACITOR

    • C. 

      USE SINGLE PHASE

    • D. 

      WILL RUN WITH REDUCED POWER OUTPUT

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