Refrigerant Machine Operator Test #3

100 Questions | Total Attempts: 7864

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Refrigerant Machine Operator Test #3

A refrigerant machine operator is an important person for the transportation of items that need a specified degree of temperature. Are you one of them or just interested? If so, take up the test and all the best.


Questions and Answers
  • 1. 
    LIQUID LEVEL GAUGES (EXCEPT BULL'S EYE TYPE) SHALL HAVE SHUT OFF VALVES:
    • A. 

      MANUAL ONLY

    • B. 

      AUTOMATIC ONLY

    • C. 

      VALVES NOT NEEDED

    • D. 

      MANUAL AND AUTOMATIC

  • 2. 
    CONVERT 20 PSIG TO Hg ABSOLUTE
    • A. 

      30

    • B. 

      70

    • C. 

      80

    • D. 

      90

  • 3. 
    WHY CAN'T YOU USE A FLARE FITTING 3/4" OR LARGER?
    • A. 

      CAN'T FLARE THAT LARGE

    • B. 

      CAN'T TIGHTEN TO GET A GOOD SEAL

    • C. 

      AGAINST THE LAW

    • D. 

      EASIER TO SWEAT

  • 4. 
    FOR SYSTEMS CONTAINING 50 LBS OF REFRIGERANT, STOP VALVES ARE REQUIRED:
    • A. 

      AT INLET OF EACH COMPRESSOR

    • B. 

      AT INLET OF LIQUID RECEIVER

    • C. 

      BEFORE AND AFTER SIGHT GLASS

    • D. 

      NOT REQUIRED

  • 5. 
    THE AMOUNT OF VENTILATION FOR REFRIGERANT REMOVAL PURPOSES IN A MACHINE ROOM SHALL BE SIZED ACCORDING TO:
    • A. 

      TOTAL AMOUNT OF REFRIGERANTS IN UNITS

    • B. 

      AMOUNT OF THE MOST FLAMMABLE REFRIGERANT

    • C. 

      AMOUNT OF REFRIGERANT IN LARGEST MACHINE

    • D. 

      TOTAL AMOUNT OF REFRIGERANT IN UNITS AND STORED IN MACHINE ROOM

  • 6. 
    THE OUTLET FROM A FAN OR AIR DUCT USED TO VENTILATE REFRIGERANTS MUST BE AT LEAST _____ FEET FROM ANY AIR INTAKE OR EXHAUST OR ANY OPENINGS IN AN ADJOINING BUILDING
    • A. 

      5

    • B. 

      10

    • C. 

      20

    • D. 

      50

  • 7. 
    YOU ARE A RMO AND YOU WANT TO WORK ON THE MACHINES PRESSURE RELIEF VALVE ON A DUAL PRESSURE RELIEF VALVE SYSTEM.  WHAT VALVE WOULD YOU INSTALL TO WORK ON ONE PRESSURE RELIEF VALVE WHILE ALLOWING THE OTHER ONE TO OPERATE IN THE SYSTEM?
    • A. 

      GATE VALVE

    • B. 

      BUTTERFLY VALVE OR PLUG VALVE

    • C. 

      TWO WAY VALVE

    • D. 

      THREE WAY VALVE

  • 8. 
    A WATER REGULATING VALVE IS CONNECTED TO THE OUTLET OF THE CONDENSER.  WHAT IS THIS VALVE DESIGNED TO DO?
    • A. 

      MAINTAIN A CONDENSER PRESSURE WITHIN PRESET LIMITS

    • B. 

      MAINTAIN A CONSTANT WATER PRESSURE

    • C. 

      MAINTAIN A CONSTANT WATER TEMPERATURE

    • D. 

      MAINTAIN A CONSTANT CONDENSER PRESSURE

  • 9. 
    YOU ARE AN RMO AND YOU START THE MACHINE AND THE MACHINE DOESN'T START.  YOUR FUSES, CIRCUIT BREAKERS AND ELECTRICAL COMPONENTS ARE ALL GOOD.  WHAT WOULD YOU CHECK NEXT?
    • A. 

      SIGHTGLASS

    • B. 

      THERMOSTAT

    • C. 

      LOW PRESSURE CUT OUT, PRESSURE SWITCH

    • D. 

      REFRIGERANT CHARGE

  • 10. 
    WHAT IS A SUPERHEATED VAPOR?
    • A. 

      VERY HIGH TEMPERATURE GAS MIXED WITH LIQUID

    • B. 

      DRY VAPOR

    • C. 

      DRY VAPOR AT ITS BOILING POINT

    • D. 

      DRY VAPOR ABOVE ITS BOILING POINT

  • 11. 
    HOW DOES A SOLENOID VALVE WORK?
    • A. 

      OPEN A PLUNGER AND ALLOW REFRIGERANT IN

    • B. 

      OPEN SPRING VALVE AND ALLOW REFRIGERANT IN

    • C. 

      MANUALLY OPEN AND ALLOW REFRIGERANT IN

    • D. 

      MANUALLY CLOSE AND PREVENT REFRIGERANT IN

  • 12. 
    WHEN A THERMOSTATIC EXPANSION VALVE IS OPERATING PROPERLY, THE END OF THE COIL WILL CONTAIN
    • A. 

      SATURATED VAPOR

    • B. 

      SUPERHEATED VAPOR

    • C. 

      LOW TEMPERATURE LIQUID

    • D. 

      HOT VAPOR

  • 13. 
    A COMPRESSOR THAT USES A SHAFT WITH A MECHANICAL SEAL, WHAT IS THE VALVE PLATE MADE OF?
    • A. 

      METAL/CARBON

    • B. 

      PLASTIC

    • C. 

      RUBBER

    • D. 

      SILICON

  • 14. 
    ON A VALVE PLATE, WHERE ARE THE SUCTION AND DISCHARGE VALVES LOCATED?
    • A. 

      SUCTION ON TOP, DISCHARGE ON BOTTOM

    • B. 

      SUCTION ON BOTTOM, DISCHARGE ON TOP

    • C. 

      SUCTION AND DISCHARGE ON TOP

    • D. 

      SUCTION AND DISCHARGE ON BOTTOM

  • 15. 
    WHAT CONTROLS A SOLENOID VALVE ON MOTOR?
    • A. 

      WATTS

    • B. 

      VOLTS

    • C. 

      HORSE POWER

    • D. 

      AMPS

  • 16. 
    WHY IS GLYCOL A BETTER BRINE THAN SODIUM CHLORIDE?
    • A. 

      MORE CONDUCTIVE

    • B. 

      COST LESS

    • C. 

      NO CORROSION

    • D. 

      HIGHER FREEZING POINT

  • 17. 
    WHAT DOES A FILTER DRIER DO? 
    • A. 

      REMOVES PARTICLES

    • B. 

      REMOVES MOISTURE

    • C. 

      REMOVES ACID

    • D. 

      ALL OF THE ABOVE

  • 18. 
    HOW DOES A RECIPROCATING COMPRESSOR VARY CAPACITY?
    • A. 

      CYLINDER UNLOADERS

    • B. 

      HOT GAS BYPASS

    • C. 

      MOTOR SPEED VARIATIONS

    • D. 

      ALL OF THE ABOVE

  • 19. 
    A SAFETY HEAD IS:
    • A. 

      PRESSURE RELIEF VALVE INSIDE THE COMPRESSOR

    • B. 

      PRESSURE RELIEF VALVE AT TOP OF THE HEAD

    • C. 

      VALVE PLATE BEING HELD DOWN BY A SPRING

    • D. 

      HIGH SIDE PRESSURE IN SYSTEM BELOW DESIGN PRESSURE

  • 20. 
    WHEN WATER TURNS TO ICE, WHAT TAKES PLACE?
    • A. 

      SUPERHEAT

    • B. 

      HEAT OF FUSION

    • C. 

      HEAT OF EVAPORATION

    • D. 

      SUBCOOLING

  • 21. 
    WHY DO CASCADE SYSTEMS USE TWO COMPRESSORS?
    • A. 

      SPLIT THE COOLING LOAD

    • B. 

      TO ACCOMMODATE HIGH HEAD PRESSURES

    • C. 

      TO INCREASE THE COMPRESSION RATIO

    • D. 

      TO NEGATE THE EFFECT OF HIGH COMPRESSION RATIO

  • 22. 
    IF REFRIGERANT OIL IS MEASURED TO HAVE A VISCOSITY AND THE VISCOSITY NUMBER IS LOW, WHAT DOES THAT MEAN?
    • A. 

      DOESN'T FLOW

    • B. 

      FLOWS EASILY, SMOOTHLY

    • C. 

      FLOW IS SLOW

    • D. 

      RESTRICTED FLOW

  • 23. 
    IF YOU NEED TO ADD ANOTHER PUMP ONLINE, HOW DO YOU DO IT?
    • A. 

      OPEN SUCTION SIDE VALVE AND PUT DISCHARGE IN THE THROTTLE POSITION

    • B. 

      OPEN SUCTION, CLOSE DISCHARGE

    • C. 

      CLOSE SUCTION, OPEN DISCHARGE

    • D. 

      OPEN SUCTION AND SLOWLY FULLY OPEN DISCHARGE

  • 24. 
    THE AUTOMATIC EXPANSION VALVE (AEV) IS USED INSTEAD OF A TEV.  IT MAINTAINS A CONSTANT PRESSURE ON THE EVAPORATOR. ANOTHER FUNCTION IT MAY HAVE IS:
    • A. 

      WORKS WELL ON VARIABLE LOADS

    • B. 

      ALLOWS REFRIGERANT ON RISE IN PRESSURE

    • C. 

      NEEDS TEMPERATURE CONTROL TO PROTECT EVAPORATOR FROM FREEZING UP FROM COLD WATER

    • D. 

      ON WATER TYPE EVAPORATOR, FREEZING WILL NOT OCCUR

  • 25. 
    THE PRESSURE OF WATER GOING THROUGH A SHELL AND TUBE CONDENSER IS PROPORTIONAL TO THE SQUARE OF ITS VELOCITY.  IF ITS VELOCITY ORIGINALLY WAS 40 AND IT'S ORIGINAL PRESSURE WAS HALVED, WHAT WOULD THE VELOCITY BE?
    • A. 

      40

    • B. 

      30

    • C. 

      20

    • D. 

      10

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