Refrigerant Machine Operator Test #3

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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. 
    YOU ARE USING COPPER TUBING TO REPLACE A PART OF A REFRIGERATION SYSTEM.  WHAT IS USED TO BEND THE TUBING? 
    • A. 

      PIPE HICKEY

    • B. 

      SPRING TYPE TUBE BENDER

    • C. 

      VISE

    • D. 

      PINCH BAR

  • 2. 
    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

  • 3. 
    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

  • 4. 
    WHY IS GLYCOL A BETTER BRINE THAN SODIUM CHLORIDE?
    • A. 

      MORE CONDUCTIVE

    • B. 

      COST LESS

    • C. 

      NO CORROSION

    • D. 

      HIGHER FREEZING POINT

  • 5. 
    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

  • 6. 
    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

  • 7. 
    WHICH OF THE FOLLOWING ELECTRICAL COMPONENTS HAVE THE ABILITY TO STORE ELECTRICITY AND ARE SOMETIMES USED TO START MOTORS?
    • A. 

      RESISTOR

    • B. 

      RECTIFIER

    • C. 

      GENERATOR

    • D. 

      CAPACITOR

  • 8. 
    WHICH OF THE FOLLOWING BEST DESCRIBES THE NEED FOR USING A CASCADE SYSTEM?
    • A. 

      TO INCREASE THE SYSTEMS COMPRESSION RATIO

    • B. 

      TO DECREASE THE SYSTEMS COMPRESSION RATIO

    • C. 

      TO OBTAIN LOW EVAPORATOR TEMPERATURES

    • D. 

      TO PRODUCE ICE

  • 9. 
    WHICH IS BEST TO USE WHEN SOLDERING COPPER, IRON OR STEEL?
    • A. 

      BRAZING ALLOYS

    • B. 

      ANY LOW TEMPERATURE SOLDER

    • C. 

      50-50 TIN LEAD

    • D. 

      SILVER SOLDER

  • 10. 
    WHERE DO NON-CONDENSABLE VAPORS AND MOISTURE COLLECT?
    • A. 

      LIQUID LINE

    • B. 

      CONDENSER

    • C. 

      EVAPORATOR

    • D. 

      FILTER DRIER

  • 11. 
    WHEN YOU ARE FINISHED LEAK TESTING WITH NITROGEN AND R-22, THEN THE NEXT STEP WOULD BE:
    • A. 

      VENT REFRIGERANT AND NITROGEN TO OPEN AIR

    • B. 

      REMOVE REFRIGERANT AND NITROGEN AT RECOVERY MACHINE

    • C. 

      ADD REFRIGERANT

    • D. 

      ADD REFRIGERANT IF NEEDED AND PUT SYSTEM BACK ONLINE

  • 12. 
    WHEN WATER TURNS TO ICE, WHAT TAKES PLACE?
    • A. 

      SUPERHEAT

    • B. 

      HEAT OF FUSION

    • C. 

      HEAT OF EVAPORATION

    • D. 

      SUBCOOLING

  • 13. 
    WHEN READING THE HP OF A THREE PHASE MOTOR USING A CLAMP ON AMMETER YOU WOULD:
    • A. 

      TAKE MEASUREMENT ON ALL 3 PHASES

    • B. 

      TAKE MEASUREMENT ON ONE PHASE ONLY

    • C. 

      AMMETER ONLY READS AMPS

    • D. 

      TAKE VOLTAGE MEASUREMENT

  • 14. 
    WHEN OIL LEAVES THE SUMP IN A CENTRIFUGAL REFRIGERATION SYSTEM, WHERE DOES THE OIL GO?
    • A. 

      TRAVELS WITH THE REFRIGERANT TO COOL THE REFRIGERATION SYSTEM

    • B. 

      TRAVELS BACK TO THE OIL SUMP

    • C. 

      IS COMPATIBLE WITH REFRIGERANT AND WILL TRAVEL THROUGH SYSTEM AND RETURN TO THE OIL SUMP

    • D. 

      TRAVELS THROUGH THE SYSTEM AND IS DRAINED OUT OF THE SUMP BY A PETCOCK VALVE

  • 15. 
    WHEN IS A CENTRIFUGAL WATER PUMP CONSIDERED A "LIFT PUMP"?
    • A. 

      WHEN THE SUCTION INLET OF THE WATER SOURCE IS BELOW THE PUMP LEVEL

    • B. 

      WHEN THE DISCHARGE IS 120' ABOVE

    • C. 

      WHEN THE WATER IS LIFTED BY PUMP

    • D. 

      WHEN THE PUMP WEIGHS LESS THAN 50 LBS.

  • 16. 
    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

  • 17. 
    WHAT WOULD BEST DESCRIBE THE REFRIGERANT IN THE LAST EVAPORATOR COIL?
    • A. 

      VAPOR

    • B. 

      SATURATED VAPOR

    • C. 

      SUPERHEATED VAPOR

    • D. 

      DRY VAPOR

  • 18. 
    WHAT TYPE OF BEARING IS USED FOR TURBINE ROTOR SHAFT?
    • A. 

      NEEDLE BEARING

    • B. 

      SLEEVE BEARING

    • C. 

      BALL BEARING

    • D. 

      KINGSBURY BEARING

  • 19. 
    WHAT IS USED TO TRACK SPEED IN A STEAM TURBINE?
    • A. 

      TACHOMETER

    • B. 

      SPEEDOMETER

    • C. 

      PEDOMETER

    • D. 

      TRACKOMETER

  • 20. 
    WHAT IS THE TOTAL MAXIMUM AMOUNT OF REFRIGERANT YOU CAN STORE IN THE MACHINERY ROOM APART FROM YOUR REFRIGERANT IN YOUR MACHINE?
    • A. 

      100 LBS

    • B. 

      150 LBS

    • C. 

      300 LBS

    • D. 

      5 DRUMS

  • 21. 
    WHAT IS THE REASON TO PUT TWO LOW SIDE FLOATS IN PARALLEL?
    • A. 

      YOU CAN MAKE A REPAIR WITHOUT INTERRUPTING THE OTHER

    • B. 

      EACH ONE FEEDS ITS OWN EVAPORATOR

    • C. 

      IF ONE CLOGS, FLOW WILL CONTINUE THROUGH THE SECOND

    • D. 

      WHEN THE LOAD DECREASES IT WILL FEED FASTER

  • 22. 
    WHAT IS THE PURPOSE OF THE GLAND STEAM?
    • A. 

      CREATE POSITIVE PRESSURE

    • B. 

      ELIMINATE LEAKAGE AT THE END OF THE SHAFT

    • C. 

      TO HEAT THE GLANDS

    • D. 

      BOTH A AND B ARE CORRECT

  • 23. 
    WHAT IS THE PRESSURE OF R-22 AT 41°F?
    • A. 

      38 PSIG

    • B. 

      70 PSIG

    • C. 

      18.5" Hg

    • D. 

      81

  • 24. 
    WHAT IS THE ORDER OF COMPONENTS ON THE LIQUID LINE OF A RECIPROCATING SYSTEM FROM THE KING VALVE?
    • A. 

      FILTER DRIER, SOLENOID VALVE, SIGHT GLASS, TEV TO EVAPORATOR

    • B. 

      SOLENOID VALVE, FILTER DRIER, SIGHT GLASS, TEV TO EVAPORATOR

    • C. 

      SIGHT GLASS, SOLENOID VALVE, FILTER DRIER, TEV TO EVAPORATOR

    • D. 

      TEV, SIGHT GLASS, SOLENOID VALVE, FILTER DRIER TO EVAPORATOR

  • 25. 
    WHAT IS THE MINIMUM HEIGHT LEVEL INSIDE THE MACHINERY ROOM EXHAUST?
    • A. 

      LESS THAN 5'

    • B. 

      MORE THAN 5'

    • C. 

      25'

    • D. 

      50'

  • 26. 
    WHAT IS THE MAIN DISADVANTAGE OF THE SUCTION LINE FILTER DRIER COMPARED TO THE LIQUID LINE FILTER DRIER?
    • A. 

      SUCTION LINE FILTER DRIER IS HARDER TO CHANGE THAN THE LIQUID LINE FILTER DRIER

    • B. 

      IS LESS EFFICIENT THAN THE LIQUID LINE FILTER DRIER DUE TO DENSITY OF REFRIGERANT

    • C. 

      SUCTION LINE FILTER DRIER IS TOO BIG AND BULKY

    • D. 

      IF IT GETS CLOGGED THE SUCTION LINE FILTER DRIER REDUCES MORE OF THE CAPACITY OF THE COMPRESSOR THAN THE LIQUID LINE FILTER DRIER

  • 27. 
    WHAT IS THE AUXILIARY OIL PUMP USED FOR?
    • A. 

      STARTING UP

    • B. 

      LUBRICATING THE MAIN PUMP BEARINGS

    • C. 

      ONLY USED WHEN MAIN PUMP IS MALFUCTIONING

    • D. 

      USED IN RECPRROCATING MACHINES

  • 28. 
    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

  • 29. 
    WHAT IS A STEAM JET ON A SURFACE CONDENSER USED FOR?
    • A. 

      TO CREATE HIGH PRESSURE TO MAINTAIN HIGH STEAM VELOCITY

    • B. 

      TO MAINTAIN STEAM LEVEL INSIDE CONDENSER

    • C. 

      TO CREATE PROPER EXHAUST VACUUM

    • D. 

      ALL OF THE ABOVE

  • 30. 
    WHAT IS A MAJOR ADVANTAGE OF HAVING A TWO STAGE CENTRIFUGAL COMPRESSOR WITH IMPELLERS BACK TO BACK?
    • A. 

      LOWER THRUST LOAD ON BEARINGS

    • B. 

      ONE OF THE IMPELLERS CAN BE STOPPED TO ADJUST TO THE LOAD CONDITIONS

    • C. 

      YOU CAN USE DIFFERENT EVAPORATORS TO FEED DIFFERENT REFRIGERANTS TO EACH

    • D. 

      THEY CAN BE OPERATED AT A LOWER SPEED THAN THE SINGLE STAGE

  • 31. 
    WHAT INFORMATION MUST BE STAMPED ON A FUSIBLE PLUG?
    • A. 

      TYPE OF REFRIGERANT IT CAN BE USED WITH

    • B. 

      MELTING POINT OF ALLOY

    • C. 

      RELEASE PRESSURE

    • D. 

      RESET PRESSURE

  • 32. 
    WHAT DOES A FILTER DRIER DO? 
    • A. 

      REMOVES PARTICLES

    • B. 

      REMOVES MOISTURE

    • C. 

      REMOVES ACID

    • D. 

      ALL OF THE ABOVE

  • 33. 
    WHAT CONTROLS A SOLENOID VALVE ON MOTOR?
    • A. 

      WATTS

    • B. 

      VOLTS

    • C. 

      HORSE POWER

    • D. 

      AMPS

  • 34. 
    WHAT ARE WEARING RINGS USED FOR?
    • A. 

      TO PREVENT THE WEARING ON THE IMPELLER OR CASING

    • B. 

      TO DECREASE THE TOLERANCE BETWEEN THE IMPELLER AND CASING

    • C. 

      TO INCREASE EFFICIENCY

    • D. 

      ALL OF THE ABOVE

  • 35. 
    WHAT ARE THE RECOVERY REQUIREMENTS FOR LOW PRESSURE APPLIANCES
    • A. 

      25" Hg

    • B. 

      0 PSI

    • C. 

      10" Hg

    • D. 

      5" Hg

  • 36. 
    WATER WHEN MIXED WITH REFRIGERANT IN A RECIPROCATING SYSTEM WILL:
    • A. 

      LUBRICATE THE SYSTEM

    • B. 

      FORM ACIDS AND SLUDGE

    • C. 

      CAUSE NON-CONDENSEABLES TO FORM

    • D. 

      FREEZE UP IN CONDENSER

  • 37. 
    VENTILATION IN THE MACHINE ROOM DEPENDS ON THE:
    • A. 

      AMOUNT OF FLAMMABLE REFRIGERANT

    • B. 

      AMOUNT OF REFRIGERANT STORED IN THE CONTAINER

    • C. 

      AMOUNT OF REFRIGERANT IN THE MACHINE

    • D. 

      THE TOTAL AMOUNT OF REFRIGERANT IN THE MACHINERY ROOM

  • 38. 
    TO RAISE 10 LBS. OF WATER 1°F, HOW ANY BTUs DO YOU NEED?
    • A. 

      1

    • B. 

      5

    • C. 

      20

    • D. 

      10

  • 39. 
    TO PREVENT AGAINST STRUCTURAL COLLAPSE IN PIPE WORK, WHEN INSTALLING BENDED COPPER TUBING:
    • A. 

      USE ANNEALED COPPER

    • B. 

      USE A SPRING BENDER

    • C. 

      USE A LARGE RADIUS

    • D. 

      USE BRAZED ELBOWS

  • 40. 
    THE UNIT USED TO MEASURE THE AMOUNT OF ELECTRONS FLOWING PAST A CERTAIN POINT IN AN ELECTRICAL CIRCUIT IS CALLED:
    • A. 

      OHM

    • B. 

      AMPERE

    • C. 

      VOLT

    • D. 

      WATT

    • E. 

      NONE OF THE ABOVE

  • 41. 
    THE TYPE OF REFRIGERANT IN THE FEELER BULB ON A SYSTEM WOULD BE:
    • A. 

      SAME AS REFRIGERANT IN SYSTEM

    • B. 

      HIGHLY FLAMMABLE / HIGHLY TOXIC

    • C. 

      NON FLAMMABLE / NON TOXIC

    • D. 

      WOULD BE DIFFERENT TYPE OF REFRIGERANT THAN THE ONE IN THE SYSTEM

  • 42. 
    THE TRUE POWER CONSUMED BY AN INDUCTION MOTOR CAN BEST BE DESCRIBED BY THE FOLLOWING FORMULA:
    • A. 

      CURRENT x VOLTAGE x POWER FACTOR

    • B. 

      CURRENT x VOLTAGE

    • C. 

      VOLTAGE x RESISTANCE

    • D. 

      CURRENT x RESISTANCE

  • 43. 
    THE SUCTION SERVICE VALVE ON A RECIPROCATING MACHINE IS FRONT SEATED.  YOU HAVE EVACUATED DOWN TO 25" Hg.  YOU SHUT VACUUM  PUMP OFF AND LOW SIDE PRESSURE RISES IMMEDIATELY.  WHAT IS THE CAUSE?
    • A. 

      FAULTY SUCTION SERVICE VALVE

    • B. 

      FAULTY (SUCTION) COMPRESSOR VALVE

    • C. 

      FAULTY DISCHARGE VALVE

    • D. 

      FAULTY LIQUID LINE STOP VALVE

  • 44. 
    THE STRENGTH OF THE STRONG LIQUOR IN AN ABSORPTION SYSTEM DECREASES AS THE: 
    • A. 

      EXPANSION VALVE IS OPENED

    • B. 

      CONDENSER PRESSURE DECREASES

    • C. 

      EVAPORATOR LOAD INCREASES

    • D. 

      EVAPORATOR LOAD DECREASES

  • 45. 
    THE RMO WANTS TO GET A TEMPERATURE READING FROM THE SUCTION LINE, BUT THERE ARE NO GAUGES:
    • A. 

      THE RMO CAN TOUCH THE LINE AND USE HIS EXPERIENCE TO ESTIMATE WHAT THE TEMPERATURE IS

    • B. 

      BUY A THERMOMETER AND STICK IT ON THE SUCTION LINE WITH PUTTY

    • C. 

      GET TWO THERMOMETERS AND GET THE AVERAGE READINGS

    • D. 

      TOUCH THE THERMOMETER ON THE SUCTION LINE AND GET A READING

  • 46. 
    THE PUMP SEAL PREVENTS WATER FROM LEAKING ON A CENTRIFUGAL WATER PUMP WHEN UNDER POSITIVE PRESSURE.  WHAT OTHER FUNCTION MAY IT HAVE?
    • A. 

      TO ALLOW WATER TO LEAK OFF WHEN USING MECHANICAL SEAL TYPE

    • B. 

      SHOWS THAT WATER IS INSIDE WHEN IT IS DRIPPING

    • C. 

      PREVENTS AIR FROM ENTERING WHEN IT IS UNDER NEGATIVE PRESSURE

    • D. 

      STEAM CREATES POSITIVE PRESSURE TO PREVENT STEAM LEAKAGE

  • 47. 
    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

  • 48. 
    THE OVERSPEED TRIP IS:
    • A. 

      A DEVICE THAT WILL SLOW THE MACHINE DOWN IN THE EVENT OF EXCESSIVE SPEED

    • B. 

      A GIMPLE SAFETY VALVE TO STOP THE TURBINE IN THE EVENT OF THE RPMs REACHING OVER THE MAXIMUM SPEED

    • C. 

      A DEVICE TO DE-ENERGIZE MOTOR STARTER TO SHUT MOTOR DOWN IN THE EVENT OF RPMs REACHING OVER THE MAXIMUM SPEED

    • D. 

      MECHANISM TO SIGNAL MACHINE TO INCREASE SPEED

  • 49. 
    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

  • 50. 
    THE ELECTRIC POWER DELIVERED TO A LIQUID LINE SOLENOID VALVE IS MEASURE IN:
    • A. 

      OHMS

    • B. 

      VOLTAGE

    • C. 

      AMPS

    • D. 

      WATTS

  • 51. 
    THE CENTER PORT OF THE GAUGE MANIFOLD IS CONNECTED TO?
    • A. 

      RECOVERY MACHINE

    • B. 

      CHARGING CYLINDER

    • C. 

      VACUUM PUMP

    • D. 

      ALL OF THE ABOVE

  • 52. 
    • 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

  • 53. 
    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

  • 54. 
    REGARDLESS OF THE SAFETY CLASSIFICATION OF THE REFRIGERANT IN USE, IN THE EVENT OF REFRIGERANT ESCAPE, THE RMO SHOULD BE AWARE OF:
    • A. 

      A REFRIGERANT FIRE

    • B. 

      REFRIGERANT POISONING

    • C. 

      OXYGEN DEPRIVATION

    • D. 

      ATMOSPHERIC SUPERHEATING

  • 55. 
    REFRIGERANT OIL QUALITY IS MEASURED IN VISCOSITY, THE LEAST DESIRABLE QUALITY IN THE OIL WOULD BE:
    • A. 

      HIGH VISCOSITY

    • B. 

      SOUR TASTE

    • C. 

      LOW VISCOSITY

    • D. 

      NONE OF THE ABOVE

  • 56. 
    QUICK CONNECT FITTINGS ARE CONSIDERED AS:
    • A. 

      LOW LOSS FITTINGS

    • B. 

      SOLDERED FITTINGS

    • C. 

      FLARE FITTINGS

    • D. 

      AUTOMATIC LOSS FITTINGS

  • 57. 
    ON THE HIGH SIDE OF THE SYSTEM, LIQUID STOP VALVES SHOULD BE PLACED:
    • A. 

      IN FRONT AND AFTER THE BULL'S EYE SIGHT GLASS

    • B. 

      ON THE SUCTION LINE AND DISCHARGE LINE AFTER THE COMPRESSOR

    • C. 

      IN FRONT OF AND AFTER THE MUFFLER

    • D. 

      ALL OF THE ABOVE

  • 58. 
    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

  • 59. 
    ON A CENTRIFUGAL WATER PUMP THE CONDITIONS ARE CORRECTLY PRIMED WHEN:
    • A. 

      IT IS FULL OF WATER AND ALL AIR HAS BEEN PURGED OUT

    • B. 

      WATER IS LEAKING FROM THE PACKING

    • C. 

      THE PACKING WILL MAINTAIN THE WATER IN THE PUMP

    • D. 

      NO REFRIGERANT IS LEAKING

  • 60. 
    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

  • 61. 
    IN AN AMMONIA ABSORPTION SYSTEM THE ANALYZER IS LOCATED BETWEEN THE:
    • A. 

      GENERATOR AND RECTIFIER

    • B. 

      ABSORBER AND EVAPORATOR

    • C. 

      RECTIFIER AND CONDENSER

    • D. 

      CONDENSER AND RECEIVER

  • 62. 
    IN ADDITION TO EVAPORATOR PRESSURE, WHAT OTHER FORCE DETERMINES THE FLOW THROUGH AN AUTOMATIC EXPANSION VALVE?
    • A. 

      SPRING PRESSURE

    • B. 

      CONDENSER PRESSURE

    • C. 

      CUT-IN PRESSURE

    • D. 

      DESIGN PRESSURE

  • 63. 
    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

  • 64. 
    IF YOU HAVE A 3 LINE CABLE SUPPLYING ENERGY TO YOUR EQUIPMENT, AND ONLY TWO LINES HAVE FUSES, THE UNFUSED LINE WOULD BE?
    • A. 

      CONNECT THE EXTRA LINE TO MAKE 3 PHASE

    • B. 

      2 UNFUSED WIRES DO NOT NEED TO BE INSULATED

    • C. 

      THE NEUTRAL LINE OF A 120/240 CIRCUIT

    • D. 

      THIS WOULD PRESENT AN UNSAFE CONDITION

  • 65. 
    IF YOU ARE USING A RECOVERY MACHINE TO RECOVER REFRIGERANT FROM THE SYSTEM WITHOUT USING THE SYSTEM COMPRESSOR, WHAT KIND OF RECOVERY MACHINE IS THAT?
    • A. 

      SELF CONTAINED

    • B. 

      SELF DEPENDENT

    • C. 

      CENTRIFUGAL RECOVERY MACHINE

    • D. 

      NONE OF THE ABOVE

  • 66. 
    IF THE UNLOADER FAILS TO OPERATE WHEN NEEDED, WHAT WOULD HAPPEN?
    • A. 

      EVAPORATOR PRESSURE WILL REMAIN UNAFFECTED

    • B. 

      EVAPORATOR TEMPERATURE WILL GO DOWN

    • C. 

      COMPRESSOR WILL SHORT CYCLE

    • D. 

      COMPRESSOR WOULD VIBRATE

  • 67. 
    IF THE CHEMICAL TREATMENT WOULD BE TEMPORARILY UNAVAILABLE, YOU WOULD:
    • A. 

      WEEKLY DRAIN THE TOWER AND SCRAPE CLEAN EVERYTHING

    • B. 

      WEEKLY CHANGE ALL CONDENSER WATER

    • C. 

      CHANGE FROM CITY WATER TO DISTILLED WATER

    • D. 

      CHANGE THE BLEEDING SETTING OF THE TOWER WATER SO MORE BLEEDING WILL TAKE PLACE

  • 68. 
    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

  • 69. 
    IF 10 BTUs IS TRANSFERRED TO 10 LBS. OF WATER, THE INCREASE IN TEMPERATURE IS CLOSEST TO:
    • A. 

      10°F

    • B. 

      10°C

    • C. 

      1°F

    • D. 

      1°C

  • 70. 
    HOW MANY BTUs ARE ABSORBED IN 5 TONS OF ICE?
    • A. 

      188,000

    • B. 

      2,200,000

    • C. 

      1,440,000

    • D. 

      NONE

  • 71. 
    HOW LONG DOES IT TAKE TO WARM UP A STEAM TURBINE?
    • A. 

      15-20 MINUTES

    • B. 

      30-40 MINUTES

    • C. 

      NO LESS THAN 60 MINUTES

    • D. 

      DOESN'T NEED WARM UP

  • 72. 
    HOW IS A WATTMETER USED?
    • A. 

      BY USING 4 LEADS, AND TAKING 1 READING

    • B. 

      BY TAKING 3 READINGS

    • C. 

      BY USING OHMMETER

    • D. 

      ALL OF THE ABOVE

  • 73. 
    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

  • 74. 
    HOW DOES A RECIPROCATING COMPRESSOR VARY CAPACITY?
    • A. 

      CYLINDER UNLOADERS

    • B. 

      HOT GAS BYPASS

    • C. 

      MOTOR SPEED VARIATIONS

    • D. 

      ALL OF THE ABOVE

  • 75. 
    HOW DO YOU KEEP PROPER WATER LEVEL IN THE HOT WELL?
    • A. 

      SLOW TURBINE DOWN

    • B. 

      ALTERNATE SPEED OF TURBINE

    • C. 

      VERY FLOW OF CONDENSER WATER

    • D. 

      WITH OVERBOARD AND RECYCLING VALVE

  • 76. 
    HOW DO YOU INCREASE THE PRESSURE OF A CENTRIFUGAL COMPRESSOR?
    • A. 

      VARIABLE GUIDE VANES

    • B. 

      INCREASE SUB COOL LEVEL

    • C. 

      INCREASE SPEED OF MOTOR

    • D. 

      ALL OF THE ABOVE

  • 77. 
    HOW DO YOU CONTROL CAPACITY OF A CENTRIFUGAL COMPRESSOR WITH VARIABLE GUIDE VANES?
    • A. 

      INCREASE SUB-COOLING

    • B. 

      INCREASE THE SPEED OF THE MOTOR

    • C. 

      VARY THE PASSAGES OF THE VANES

    • D. 

      PISTON VALVE CLEARANCE

  • 78. 
    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

  • 79. 
    CONVERT 20 PSIG TO Hg ABSOLUTE
    • A. 

      30

    • B. 

      70

    • C. 

      80

    • D. 

      90

  • 80. 
    CENTRIFUGAL COMPRESSORS USE WHAT KIND OF REFRIGERANT?
    • A. 

      CFCs

    • B. 

      HIGH PRESSURE REFRIGERANT

    • C. 

      LOW PRESSURE REFRIGERANT

    • D. 

      ALL THE ABOVE

  • 81. 
    BEFORE USING A VOLTMETER, THE TECHNICIAN SHOULD ALWAYS:
    • A. 

      ZERO THE OHM ADJUSTMENT

    • B. 

      TOUCH THE TWO LEADS TOGETHER TO ENSURE CONTINUITY

    • C. 

      SET THE RANGE SELECTOR TO A SETTING HIGHER THAN THE VOLTAGE EXPECTED TO BE READ

    • D. 

      TURN THE POWER OFF

    • E. 

      NONE OF THE ABOVE

  • 82. 
    AXVs MAINTAIN CONSTANT EVAPORATOR PRESSURE, THEY ALSO:
    • A. 

      CLOSE WHEN THE LOAD INCREASES

    • B. 

      ARE USED WHEN THERE IS A WIDE RANGE IN LOAD

    • C. 

      ARE AFFECTED BY CONDENSER HEAD PRESSURE

    • D. 

      REQUIRE OTHER SAFETY DEVICES WHEN BEING USED IN EVAPORATORS THAT CHILL WATER

  • 83. 
    ASIDE FROM VENTING REFRIGERANT FROM YOUR HOSE CONNECTIONS, THE ONLY OTHER TIME YOU MAY DISCHARGE REFRIGERANT WOULD BE?
    • A. 

      WHEN A FIRE DEPT ENGINEER IS PRESENT

    • B. 

      NEVER

    • C. 

      AFTER THE FIRE DEPT ENGINEER LEAVES THE ROOM

    • D. 

      TO CHECK IF THERE IS REFRIGERANT IN THE SYSTEM

  • 84. 
    AS AN RMO YOU ENTER A SYSTEM OF A RECIPROCATING REFRIGERATION UNIT.  THIS SYSTEM HAS A 150 LB. REFRIGERANT CHARGE, YOU WOULD EXPECT TO FIND STOP VALVES:
    • A. 

      ON THE INLET SUPPLY AND DISCHARGE LINE

    • B. 

      BEFORE AND AFTER LIQUID BULL'S EYE SIGHT GLASS

    • C. 

      ON THE INLET LINE OF THE CONDENSER RECEIVER

    • D. 

      ON THE INLET TO EACH COMPRESSOR

  • 85. 
    AN OPERATOR HAS BEEN ASSIGNED TO RUN A CENTRIFUGAL COMPRESSOR. THE CAPACITY CONTROL IS MOST LIKELY ACHIEVED BY:
    • A. 

      INCREASING SPEED OF IMPELLER

    • B. 

      ADJUSTING THE SIZE OF THE VANE PASSAGES

    • C. 

      DECREASING THE SPEED OF THE IMPELLER

    • D. 

      SOLENOID UNLOADERS

  • 86. 
    AN OPEN TYPE COMPRESSOR IS KEEPING THE REFRIGERANT FROM ESCAPING BY TIGHTENING A SEAL MADE OF:
    • A. 

      RUBBER

    • B. 

      GRAPHITE LOADED FIBER

    • C. 

      CARBON AND METAL

    • D. 

      FORTIFIED PLASTIC

  • 87. 
    AN ELECTRICAL WIRING SCHEMATIC WOULD SHOW:
    • A. 

      THE PATH OF ELECTRICITY IN THE CIRCUIT

    • B. 

      THE DIAGRAM OF A SWITCH

    • C. 

      A POINT TO POINT PICTURE OF ALL THE WIRING IN THE CIRCUIT

    • D. 

      ONLY DC WIRING

  • 88. 
    AFTER THE COMPRESSOR YOU HAVE THE OIL SEPARATOR, WHICH:
    • A. 

      IN GENERAL RETURNS THE OIL TO THE CRANKCASE

    • B. 

      FILTERS THE OIL AND RETURNS THE OIL TO THE CRANKCASE

    • C. 

      REMOVES THE WATER FROM THE OIL

    • D. 

      DISTRIBUTES OIL TO THE EVAPORATOR

  • 89. 
    AFTER OIL CIRCULATES IN A CENTRIFUGAL MACHINE, WHERE DOES THE OIL SETTLE AND HOW DO YOU EXTRACT IT OUT?
    • A. 

      COMPRESSOR CRANKCASE AND DRAIN

    • B. 

      OIL SUMP AND DRAIN FROM OIL VALVE

    • C. 

      CONDENSER BOTTOM AND LIQUID SERVICE VALVE

    • D. 

      EVAPORATOR AND EXTRACT FROM DRAIN VALVE

  • 90. 
    AFTER LEAK DETECTING WITH MOISTURE OF NITROGEN AND A TRACE OF R-22, THE RMO:
    • A. 

      HAS TO RECOVER ONLY THE R-22

    • B. 

      CAN VENT THE MIXTURE TO THE ATMOSPHERE

    • C. 

      RECOVER BOTH INTO THE SAME CONTAINER

    • D. 

      RECOVER BOTH, BUT IN SEPARATE CYLINDERS

  • 91. 
    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

  • 92. 
    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

  • 93. 
    A RECIPROCATING COMPRESSOR SHAFT SEAL IS MADE UP OF:
    • A. 

      PLASTIC

    • B. 

      RUBBER

    • C. 

      GRAPHITE FIBER HEMP

    • D. 

      METAL

  • 94. 
    A MOTOR PULLEY HAS A DIAMETER OF 3" AND RUNS AT 1,400 RPMs.  THE FAN PULLEY HAS A DIAMETER OF 5¼", AT HOW MANY REVOLUTIONS PER MINUTE DOES THE FAN PULLEY REVOLVE?
    • A. 

      800 RPMs

    • B. 

      1600 RPMs

    • C. 

      200 RPMs

    • D. 

      1800 RPMs

  • 95. 
    A HALIDE TORCH IS TO BE USED OUTSIDE ON A ROOFTOP TO CHECK FOR LEAKS ON A REFRIGERATION UNIT.  WHY SHOULD YOU NOT GENERALLY USE THIS DEVICE OUTSIDE?
    • A. 

      RAIN CAN GET IN AND AFFECT ITS PERFORMANCE

    • B. 

      WIND CAN AFFECT THE FLAME SIZE

    • C. 

      YOU WILL NOT BE ABLE TO DETECT THE CHANGE IN COLOR DUE TO THE BRIGHTNESS OUTSIDE

    • D. 

      OXYGEN OUTSIDE MAY CAUSE EXPLOSION

  • 96. 
    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

  • 97. 
    A CENTRIFUGAL PUMP OPERATES AT 92 FEET HEAD.  WHAT WOULD BE THE CORRESPONDING PRESSURE IN PSIG BE CLOSEST TO?
    • A. 

      180

    • B. 

      20

    • C. 

      40

    • D. 

      90

  • 98. 
    A "LIFT PUMP"
    • A. 

      ACTUALLY LIFTS WATER TO THE PUMP SUCTION

    • B. 

      IS LOCATED ABOVE THE SUCTION PIPE FEEDING IT

    • C. 

      IS A PUMP THAT IS RELATIVELY LIGHT IN WEIGHT AND CAN BE LIFTED

    • D. 

      IS A SAFETY PUMP USED TO PROTECT SYSTEM

  • 99. 
    500 BTUs ARE REMOVED FROM 50 LBS. OF WATER AT 60°F, WHAT IS THE FINAL WATER TEMPERATURE?
    • A. 

      40°F

    • B. 

      50°F

    • C. 

      60°F

    • D. 

      70°F

  • 100. 
    1000 BTUs OF HEAT IS ADDED TO 100 LBS. OF WATER.  HOW MANY DEGREES DID THE TEMPERATURE OF WATER INCREASE?
    • A. 

      10°C

    • B. 

      10°F

    • C. 

      1°C

    • D. 

      1°F