Refrigerant Machine Operator Test #3
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(27).png "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.
- 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
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