Refrigerant Machine Operator Practice Test #3 Flashcards
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:
ON THE INLET SUPPLY AND DISCHARGE LINE
BEFORE AND AFTER LIQUID BULL’S EYE SIGHT GLASS
ON THE INLET LINE OF THE CONDENSER RECEIVER
ON THE INLET TO EACH COMPRESSOR
ON THE INLET LINE OF THE CONDENSER RECEIVER
HOW DO YOU INCREASE THE PRESSURE OF A CENTRIFUGAL COMPRESSOR?
VARIABLE GUIDE VANES
INCREASE SUB COOL LEVEL
INCREASE SPEED OF MOTOR
ALL OF THE ABOVE
INCREASE SPEED OF MOTOR
THE STRENGTH OF THE STRONG LIQUOR IN AN ABSORPTION SYSTEM DECREASES AS THE:
EXPANSION VALVE IS OPENED
CONDENSER PRESSURE DECREASES
EVAPORATOR LOAD INCREASES
EVAPORATOR LOAD DECREASES
EVAPORATOR LOAD DECREASES
WHAT IS A STEAM JET ON A SURFACE CONDENSER USED FOR?
TO CREATE HIGH PRESSURE TO MAINTAIN HIGH STEAM VELOCITY
TO MAINTAIN STEAM LEVEL INSIDE CONDENSER
TO CREATE PROPER EXHAUST VACUUM
ALL OF THE ABOVE
TO CREATE PROPER EXHAUST VACUUM
AXVs MAINTAIN CONSTANT EVAPORATOR PRESSURE, THEY ALSO:
CLOSE WHEN THE LOAD INCREASES
ARE USED WHEN THERE IS A WIDE RANGE IN LOAD
ARE AFFECTED BY CONDENSER HEAD PRESSURE
REQUIRE OTHER SAFETY DEVICES WHEN BEING USED IN EVAPORATORS THAT CHILL WATER
CLOSE WHEN THE LOAD INCREASES
IF THE UNLOADER FAILS TO OPERATE WHEN NEEDED, WHAT WOULD HAPPEN?
EVAPORATOR PRESSURE WILL REMAIN UNAFFECTED
EVAPORATOR TEMPERATURE WILL GO DOWN
COMPRESSOR WILL SHORT CYCLE
COMPRESSOR WOULD VIBRATE
EVAPORATOR TEMPERATURE WILL GO DOWN
A CENTRIFUGAL PUMP OPERATES AT 92 FEET HEAD. WHAT WOULD BE THE CORRESPONDING PRESSURE IN PSIG BE CLOSEST TO?
180
20
40
90
40
2.31 feet of head to psi
THE ELECTRIC POWER DELIVERED TO A LIQUID LINE SOLENOID VALVE IS MEASURE IN:
OHMS
VOLTAGE
AMPS
WATTS
WATTS
Watts is the unit of power, or rate which energy is transferred or consumed
ON THE HIGH SIDE OF THE SYSTEM, LIQUID STOP VALVES SHOULD BE PLACED:
IN FRONT AND AFTER THE BULL’S EYE SIGHT GLASS
ON THE SUCTION LINE AND DISCHARGE LINE AFTER THE COMPRESSOR
IN FRONT OF AND AFTER THE MUFFLER
ALL OF THE ABOVE
IN FRONT AND AFTER THE BULL’S EYE SIGHT GLASS
A WATER REGULATING VALVE IS CONNECTED TO THE OUTLET OF THE CONDENSER. WHAT IS THIS VALVE DESIGNED TO DO?
MAINTAIN A CONDENSER PRESSURE WITHIN PRESET LIMITS
MAINTAIN A CONSTANT WATER PRESSURE
MAINTAIN A CONSTANT WATER TEMPERATURE
MAINTAIN A CONSTANT CONDENSER PRESSURE
MAINTAIN A CONSTANT CONDENSER PRESSURE
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:
WORKS WELL ON VARIABLE LOADS
ALLOWS REFRIGERANT ON RISE IN PRESSURE
NEEDS TEMPERATURE CONTROL TO PROTECT EVAPORATOR FROM FREEZING UP FROM COLD WATER
ON WATER TYPE EVAPORATOR, FREEZING WILL NOT OCCUR
ON WATER TYPE EVAPORATOR, FREEZING WILL NOT OCCUR
WHEN READING THE HP OF A THREE PHASE MOTOR USING A CLAMP ON AMMETER YOU WOULD:
TAKE MEASUREMENT ON ALL 3 PHASES
TAKE MEASUREMENT ON ONE PHASE ONLY
AMMETER ONLY READS AMPS
TAKE VOLTAGE MEASUREMENT
AMMETER ONLY READS AMPS
IN AN AMMONIA ABSORPTION SYSTEM THE ANALYZER IS LOCATED BETWEEN THE:
GENERATOR AND RECTIFIER
ABSORBER AND EVAPORATOR
RECTIFIER AND CONDENSER
CONDENSER AND RECEIVER
GENERATOR AND RECTIFIER
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?
40
30
20
10
10
The pressure of water going through a shell and tube condenser is proportional to the square of its velocity. If the original velocity was 40 and the original pressure was halved, the new velocity can be calculated by taking the square root of the original velocity and multiplying it by the square root of the original pressure. In this case, the square root of 40 is 6.32, and the square root of 0.5 (halved pressure) is 0.71. Multiplying these two values together gives a new velocity of approximately 4.49, which is closest to 10. Therefore, the new velocity would be 10.
A SAFETY HEAD IS:
PRESSURE RELIEF VALVE INSIDE THE COMPRESSOR
PRESSURE RELIEF VALVE AT TOP OF THE HEAD
VALVE PLATE BEING HELD DOWN BY A SPRING
HIGH SIDE PRESSURE IN SYSTEM BELOW DESIGN PRESSURE
VALVE PLATE BEING HELD DOWN BY A SPRING
THE TYPE OF REFRIGERANT IN THE FEELER BULB ON A SYSTEM WOULD BE:
SAME AS REFRIGERANT IN SYSTEM
HIGHLY FLAMMABLE / HIGHLY TOXIC
NON FLAMMABLE / NON TOXIC
WOULD BE DIFFERENT TYPE OF REFRIGERANT THAN THE ONE IN THE SYSTEM
NON FLAMMABLE / NON TOXIC
WHAT IS A MAJOR ADVANTAGE OF HAVING A TWO STAGE CENTRIFUGAL COMPRESSOR WITH IMPELLERS BACK TO BACK?
LOWER THRUST LOAD ON BEARINGS
ONE OF THE IMPELLERS CAN BE STOPPED TO ADJUST TO THE LOAD CONDITIONS
YOU CAN USE DIFFERENT EVAPORATORS TO FEED DIFFERENT REFRIGERANTS TO EACH
THEY CAN BE OPERATED AT A LOWER SPEED THAN THE SINGLE STAGE
THEY CAN BE OPERATED AT A LOWER SPEED THAN THE SINGLE STAGE
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?
800 RPMs
1600 RPMs
200 RPMs
1800 RPMs
800 RPMs
The speed of rotation of a pulley is inversely proportional to its diameter. In this case, the motor pulley has a smaller diameter than the fan pulley, so it will rotate faster. The ratio of the diameters is 3/5.25 (3 divided by 5.25), which is approximately 0.571. Since the motor pulley rotates at 1,400 RPMs, the fan pulley will rotate at 0.571 times that speed, which is approximately 800 RPMs.
HOW DO YOU KEEP PROPER WATER LEVEL IN THE HOT WELL?
SLOW TURBINE DOWN
ALTERNATE SPEED OF TURBINE
VERY FLOW OF CONDENSER WATER
WITH OVERBOARD AND RECYCLING VALVE
WITH OVERBOARD AND RECYCLING VALVE
TO PREVENT AGAINST STRUCTURAL COLLAPSE IN PIPE WORK, WHEN INSTALLING BENDED COPPER TUBING:
USE ANNEALED COPPER
USE A SPRING BENDER
USE A LARGE RADIUS
USE BRAZED ELBOWS
USE A LARGE RADIUS
FOR SYSTEMS CONTAINING 50 LBS OF REFRIGERANT, STOP VALVES ARE REQUIRED:
AT INLET OF EACH COMPRESSOR
AT INLET OF LIQUID RECEIVER
BEFORE AND AFTER SIGHT GLASS
NOT REQUIRED
AT INLET OF EACH COMPRESSOR
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?
FAULTY SUCTION SERVICE VALVE
FAULTY (SUCTION) COMPRESSOR VALVE
FAULTY DISCHARGE VALVE
FAULTY LIQUID LINE STOP VALVE
FAULTY (SUCTION) COMPRESSOR VALVE
WHAT IS THE MINIMUM HEIGHT LEVEL INSIDE THE MACHINERY ROOM EXHAUST?
LESS THAN 5’
MORE THAN 5’
25’
50’
LESS THAN 5’
AN ELECTRICAL WIRING SCHEMATIC WOULD SHOW:
THE PATH OF ELECTRICITY IN THE CIRCUIT
THE DIAGRAM OF A SWITCH
A POINT TO POINT PICTURE OF ALL THE WIRING IN THE CIRCUIT
ONLY DC WIRING
THE PATH OF ELECTRICITY IN THE CIRCUIT
HOW IS A WATTMETER USED?
BY USING 4 LEADS, AND TAKING 1 READING
BY TAKING 3 READINGS
BY USING OHMMETER
ALL OF THE ABOVE
BY USING 4 LEADS, AND TAKING 1 READING
IN ADDITION TO EVAPORATOR PRESSURE, WHAT OTHER FORCE DETERMINES THE FLOW THROUGH AN AUTOMATIC EXPANSION VALVE?
SPRING PRESSURE
CONDENSER PRESSURE
CUT-IN PRESSURE
DESIGN PRESSURE
SPRING PRESSURE
AN OPERATOR HAS BEEN ASSIGNED TO RUN A CENTRIFUGAL COMPRESSOR. THE CAPACITY CONTROL IS MOST LIKELY ACHIEVED BY:
INCREASING SPEED OF IMPELLER
ADJUSTING THE SIZE OF THE VANE PASSAGES
DECREASING THE SPEED OF THE IMPELLER
SOLENOID UNLOADERS
ADJUSTING THE SIZE OF THE VANE PASSAGES
THE OVERSPEED TRIP IS:
A DEVICE THAT WILL SLOW THE MACHINE DOWN IN THE EVENT OF EXCESSIVE SPEED
A GIMPLE SAFETY VALVE TO STOP THE TURBINE IN THE EVENT OF THE RPMs REACHING OVER THE MAXIMUM SPEED
A DEVICE TO DE-ENERGIZE MOTOR STARTER TO SHUT MOTOR DOWN IN THE EVENT OF RPMs REACHING OVER THE MAXIMUM SPEED
MECHANISM TO SIGNAL MACHINE TO INCREASE SPEED
A GIMPLE SAFETY VALVE TO STOP THE TURBINE IN THE EVENT OF THE RPMs REACHING OVER THE MAXIMUM SPEED
AFTER THE COMPRESSOR YOU HAVE THE OIL SEPARATOR, WHICH:
IN GENERAL RETURNS THE OIL TO THE CRANKCASE
FILTERS THE OIL AND RETURNS THE OIL TO THE CRANKCASE
REMOVES THE WATER FROM THE OIL
DISTRIBUTES OIL TO THE EVAPORATOR
IN GENERAL RETURNS THE OIL TO THE CRANKCASE
WHAT CONTROLS A SOLENOID VALVE ON MOTOR?
WATTS
VOLTS
HORSE POWER
AMPS
VOLTS
Volts control a solenoid valve on a motor. Solenoid valves are electromechanical devices that use an electrical current to control the flow of fluid or gas. The voltage applied to the solenoid coil determines the strength of the magnetic field generated, which in turn controls the opening and closing of the valve.
VENTILATION IN THE MACHINE ROOM DEPENDS ON THE:
AMOUNT OF FLAMMABLE REFRIGERANT
AMOUNT OF REFRIGERANT STORED IN THE CONTAINER
AMOUNT OF REFRIGERANT IN THE MACHINE
THE TOTAL AMOUNT OF REFRIGERANT IN THE MACHINERY ROOM
AMOUNT OF REFRIGERANT IN THE MACHINE
HOW DOES A RECIPROCATING COMPRESSOR VARY CAPACITY?
CYLINDER UNLOADERS
HOT GAS BYPASS
MOTOR SPEED VARIATIONS
ALL OF THE ABOVE
ALL OF THE ABOVE
HOW DO YOU CONTROL CAPACITY OF A CENTRIFUGAL COMPRESSOR WITH VARIABLE GUIDE VANES?
INCREASE SUB-COOLING
INCREASE THE SPEED OF THE MOTOR
VARY THE PASSAGES OF THE VANES
PISTON VALVE CLEARANCE
VARY THE PASSAGES OF THE VANES
What is the primary function of the receiver in a refrigeration system?
To absorb heat from the refrigerant
To store the refrigerant after condensation
To increase the pressure of the refrigerant
To maintain the refrigerant at a constant temperature
To store the refrigerant after condensation
CONVERT 20 PSIG TO Hg ABSOLUTE
30
70
80
90
70
1 psig = 2.036 Hg. 70 is the closest to 40.36 without going over I guess
A “LIFT PUMP”
ACTUALLY LIFTS WATER TO THE PUMP SUCTION
IS LOCATED ABOVE THE SUCTION PIPE FEEDING IT
IS A PUMP THAT IS RELATIVELY LIGHT IN WEIGHT AND CAN BE LIFTED
IS A SAFETY PUMP USED TO PROTECT SYSTEM
ACTUALLY LIFTS WATER TO THE PUMP SUCTION
IF THE CHEMICAL TREATMENT WOULD BE TEMPORARILY UNAVAILABLE, YOU WOULD:
WEEKLY DRAIN THE TOWER AND SCRAPE CLEAN EVERYTHING
WEEKLY CHANGE ALL CONDENSER WATER
CHANGE FROM CITY WATER TO DISTILLED WATER
CHANGE THE BLEEDING SETTING OF THE TOWER WATER SO MORE BLEEDING WILL TAKE PLACE
CHANGE THE BLEEDING SETTING OF THE TOWER WATER SO MORE BLEEDING WILL TAKE PLACE
500 BTUs ARE REMOVED FROM 50 LBS. OF WATER AT 60°F, WHAT IS THE FINAL WATER TEMPERATURE?
40°F
50°F
60°F
70°F
50°F
500 BTU’s of heat is equal to 10F. 500 btus removed is equal to 10 degrees removed
THE UNIT USED TO MEASURE THE AMOUNT OF ELECTRONS FLOWING PAST A CERTAIN POINT IN AN ELECTRICAL CIRCUIT IS CALLED:
OHM
AMPERE
VOLT
WATT
NONE OF THE ABOVE
AMPERE
WHAT ARE THE RECOVERY REQUIREMENTS FOR LOW PRESSURE APPLIANCES
25” Hg
0 PSI
10” Hg
5” Hg
25” Hg
WHERE DO NON-CONDENSABLE VAPORS AND MOISTURE COLLECT?
LIQUID LINE
CONDENSER
EVAPORATOR
FILTER DRIER
CONDENSER
WHAT ARE WEARING RINGS USED FOR?
TO PREVENT THE WEARING ON THE IMPELLER OR CASING
TO DECREASE THE TOLERANCE BETWEEN THE IMPELLER AND CASING
TO INCREASE EFFICIENCY
ALL OF THE ABOVE
ALL OF THE ABOVE
AFTER OIL CIRCULATES IN A CENTRIFUGAL MACHINE, WHERE DOES THE OIL SETTLE AND HOW DO YOU EXTRACT IT OUT?
COMPRESSOR CRANKCASE AND DRAIN
OIL SUMP AND DRAIN FROM OIL VALVE
CONDENSER BOTTOM AND LIQUID SERVICE VALVE
EVAPORATOR AND EXTRACT FROM DRAIN VALVE
OIL SUMP AND DRAIN FROM OIL VALVE
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
5
10
20
50
20
HOW MANY BTUs ARE ABSORBED IN 5 TONS OF ICE?
188,000
2,200,000
1,440,000
NONE
1,440,000
Ice has a specific heat capacity of 0.5 BTU/lb F and it takes 144 BTU’s to melt 1 lb of ice
REFRIGERANT OIL QUALITY IS MEASURED IN VISCOSITY, THE LEAST DESIRABLE QUALITY IN THE OIL WOULD BE:
HIGH VISCOSITY
SOUR TASTE
LOW VISCOSITY
NONE OF THE ABOVE
LOW VISCOSITY
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?
SELF CONTAINED
SELF DEPENDENT
CENTRIFUGAL RECOVERY MACHINE
NONE OF THE ABOVE
SELF CONTAINED
HOW DOES A SOLENOID VALVE WORK?
OPEN A PLUNGER AND ALLOW REFRIGERANT IN
OPEN SPRING VALVE AND ALLOW REFRIGERANT IN
MANUALLY OPEN AND ALLOW REFRIGERANT IN
MANUALLY CLOSE AND PREVENT REFRIGERANT IN
OPEN A PLUNGER AND ALLOW REFRIGERANT IN
THE AMOUNT OF VENTILATION FOR REFRIGERANT REMOVAL PURPOSES IN A MACHINE ROOM SHALL BE SIZED ACCORDING TO:
TOTAL AMOUNT OF REFRIGERANTS IN UNITS
AMOUNT OF THE MOST FLAMMABLE REFRIGERANT
AMOUNT OF REFRIGERANT IN LARGEST MACHINE
TOTAL AMOUNT OF REFRIGERANT IN UNITS AND STORED IN MACHINE ROOM
AMOUNT OF REFRIGERANT IN LARGEST MACHINE
WHICH OF THE FOLLOWING BEST DESCRIBES THE NEED FOR USING A CASCADE SYSTEM?
TO INCREASE THE SYSTEMS COMPRESSION RATIO
TO DECREASE THE SYSTEMS COMPRESSION RATIO
TO OBTAIN LOW EVAPORATOR TEMPERATURES
TO PRODUCE ICE
TO OBTAIN LOW EVAPORATOR TEMPERATURES
WHICH IS BEST TO USE WHEN SOLDERING COPPER, IRON OR STEEL?
BRAZING ALLOYS
ANY LOW TEMPERATURE SOLDER
50-50 TIN LEAD
SILVER SOLDER
SILVER SOLDER
WHAT IS THE REASON TO PUT TWO LOW SIDE FLOATS IN PARALLEL?
YOU CAN MAKE A REPAIR WITHOUT INTERRUPTING THE OTHER
EACH ONE FEEDS ITS OWN EVAPORATOR
IF ONE CLOGS, FLOW WILL CONTINUE THROUGH THE SECOND
WHEN THE LOAD DECREASES IT WILL FEED FASTER
EACH ONE FEEDS ITS OWN EVAPORATOR
WHAT IS THE PRESSURE OF R-22 AT 41°F?
38 PSIG
70 PSIG
18.5” Hg
81
70 PSIG
The pressure of R-22 at 41°F is 70 PSIG. This indicates that the refrigerant R-22 is at a pressure of 70 pounds per square inch gauge at a temperature of 41°F.
ASIDE FROM VENTING REFRIGERANT FROM YOUR HOSE CONNECTIONS, THE ONLY OTHER TIME YOU MAY DISCHARGE REFRIGERANT WOULD BE?
WHEN A FIRE DEPT ENGINEER IS PRESENT
NEVER
AFTER THE FIRE DEPT ENGINEER LEAVES THE ROOM
TO CHECK IF THERE IS REFRIGERANT IN THE SYSTEM
NEVER
IF REFRIGERANT OIL IS MEASURED TO HAVE A VISCOSITY AND THE VISCOSITY NUMBER IS LOW, WHAT DOES THAT MEAN?
DOESN’T FLOW
FLOWS EASILY, SMOOTHLY
FLOW IS SLOW
RESTRICTED FLOW
FLOWS EASILY, SMOOTHLY
CENTRIFUGAL COMPRESSORS USE WHAT KIND OF REFRIGERANT?
CFCs
HIGH PRESSURE REFRIGERANT
LOW PRESSURE REFRIGERANT
ALL THE ABOVE
ALL THE ABOVE
WATER WHEN MIXED WITH REFRIGERANT IN A RECIPROCATING SYSTEM WILL:
LUBRICATE THE SYSTEM
FORM ACIDS AND SLUDGE
CAUSE NON-CONDENSEABLES TO FORM
FREEZE UP IN CONDENSER
FORM ACIDS AND SLUDGE
QUICK CONNECT FITTINGS ARE CONSIDERED AS:
LOW LOSS FITTINGS
SOLDERED FITTINGS
FLARE FITTINGS
AUTOMATIC LOSS FITTINGS
LOW LOSS FITTINGS
WHAT IS THE ORDER OF COMPONENTS ON THE LIQUID LINE OF A RECIPROCATING SYSTEM FROM THE KING VALVE?
FILTER DRIER, SOLENOID VALVE, SIGHT GLASS, TEV TO EVAPORATOR
SOLENOID VALVE, FILTER DRIER, SIGHT GLASS, TEV TO EVAPORATOR
SIGHT GLASS, SOLENOID VALVE, FILTER DRIER, TEV TO EVAPORATOR
TEV, SIGHT GLASS, SOLENOID VALVE, FILTER DRIER TO EVAPORATOR
FILTER DRIER, SOLENOID VALVE, SIGHT GLASS, TEV TO EVAPORATOR
WHEN IS A CENTRIFUGAL WATER PUMP CONSIDERED A “LIFT PUMP”?
WHEN THE SUCTION INLET OF THE WATER SOURCE IS BELOW THE PUMP LEVEL
WHEN THE DISCHARGE IS 120’ ABOVE
WHEN THE WATER IS LIFTED BY PUMP
WHEN THE PUMP WEIGHS LESS THAN 50 LBS.
WHEN THE SUCTION INLET OF THE WATER SOURCE IS BELOW THE PUMP LEVEL
WHAT IS THE PURPOSE OF THE GLAND STEAM?
CREATE POSITIVE PRESSURE
ELIMINATE LEAKAGE AT THE END OF THE SHAFT
TO HEAT THE GLANDS
BOTH A AND B ARE CORRECT
BOTH A AND B ARE CORRECT
WHEN OIL LEAVES THE SUMP IN A CENTRIFUGAL REFRIGERATION SYSTEM, WHERE DOES THE OIL GO?
TRAVELS WITH THE REFRIGERANT TO COOL THE REFRIGERATION SYSTEM
TRAVELS BACK TO THE OIL SUMP
IS COMPATIBLE WITH REFRIGERANT AND WILL TRAVEL THROUGH SYSTEM AND RETURN TO THE OIL SUMP
TRAVELS THROUGH THE SYSTEM AND IS DRAINED OUT OF THE SUMP BY A PETCOCK VALVE
TRAVELS BACK TO THE OIL SUMP
THE RMO WANTS TO GET A TEMPERATURE READING FROM THE SUCTION LINE, BUT THERE ARE NO GAUGES:
THE RMO CAN TOUCH THE LINE AND USE HIS EXPERIENCE TO ESTIMATE WHAT THE TEMPERATURE IS
BUY A THERMOMETER AND STICK IT ON THE SUCTION LINE WITH PUTTY
GET TWO THERMOMETERS AND GET THE AVERAGE READINGS
TOUCH THE THERMOMETER ON THE SUCTION LINE AND GET A READING
BUY A THERMOMETER AND STICK IT ON THE SUCTION LINE WITH PUTTY
WHAT IS THE AUXILIARY OIL PUMP USED FOR?
STARTING UP
LUBRICATING THE MAIN PUMP BEARINGS
ONLY USED WHEN MAIN PUMP IS MALFUCTIONING
USED IN RECPRROCATING MACHINES
STARTING UP
IF YOU NEED TO ADD ANOTHER PUMP ONLINE, HOW DO YOU DO IT?
OPEN SUCTION SIDE VALVE AND PUT DISCHARGE IN THE THROTTLE POSITION
OPEN SUCTION, CLOSE DISCHARGE
CLOSE SUCTION, OPEN DISCHARGE
OPEN SUCTION AND SLOWLY FULLY OPEN DISCHARGE
OPEN SUCTION SIDE VALVE AND PUT DISCHARGE IN THE THROTTLE POSITION
WHAT TYPE OF BEARING IS USED FOR TURBINE ROTOR SHAFT?
NEEDLE BEARING
SLEEVE BEARING
BALL BEARING
KINGSBURY BEARING
KINGSBURY BEARING
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?
RAIN CAN GET IN AND AFFECT ITS PERFORMANCE
WIND CAN AFFECT THE FLAME SIZE
YOU WILL NOT BE ABLE TO DETECT THE CHANGE IN COLOR DUE TO THE BRIGHTNESS OUTSIDE
OXYGEN OUTSIDE MAY CAUSE EXPLOSION
YOU WILL NOT BE ABLE TO DETECT THE CHANGE IN COLOR DUE TO THE BRIGHTNESS OUTSIDE
THE PUMP SEAL PREVENTS WATER FROM LEAKING ON A CENTRIFUGAL WATER PUMP WHEN UNDER POSITIVE PRESSURE. WHAT OTHER FUNCTION MAY IT HAVE?
TO ALLOW WATER TO LEAK OFF WHEN USING MECHANICAL SEAL TYPE
SHOWS THAT WATER IS INSIDE WHEN IT IS DRIPPING
PREVENTS AIR FROM ENTERING WHEN IT IS UNDER NEGATIVE PRESSURE
STEAM CREATES POSITIVE PRESSURE TO PREVENT STEAM LEAKAGE
PREVENTS AIR FROM ENTERING WHEN IT IS UNDER NEGATIVE PRESSURE
ON A VALVE PLATE, WHERE ARE THE SUCTION AND DISCHARGE VALVES LOCATED?
SUCTION ON TOP, DISCHARGE ON BOTTOM
SUCTION ON BOTTOM, DISCHARGE ON TOP
SUCTION AND DISCHARGE ON TOP
SUCTION AND DISCHARGE ON BOTTOM
SUCTION ON BOTTOM, DISCHARGE ON TOP
BEFORE USING A VOLTMETER, THE TECHNICIAN SHOULD ALWAYS:
ZERO THE OHM ADJUSTMENT
TOUCH THE TWO LEADS TOGETHER TO ENSURE CONTINUITY
SET THE RANGE SELECTOR TO A SETTING HIGHER THAN THE VOLTAGE EXPECTED TO BE READ
TURN THE POWER OFF
NONE OF THE ABOVE
SET THE RANGE SELECTOR TO A SETTING HIGHER THAN THE VOLTAGE EXPECTED TO BE READ
1000 BTUs OF HEAT IS ADDED TO 100 LBS. OF WATER. HOW MANY DEGREES DID THE TEMPERATURE OF WATER INCREASE?
10°C
10°F
1°C
1°F
10°F
When 1000 BTUs of heat is added to 100 lbs. of water, the temperature of the water increases by 10°F.
THE CENTER PORT OF THE GAUGE MANIFOLD IS CONNECTED TO?
RECOVERY MACHINE
CHARGING CYLINDER
VACUUM PUMP
ALL OF THE ABOVE
ALL OF THE ABOVE
HOW LONG DOES IT TAKE TO WARM UP A STEAM TURBINE?
15-20 MINUTES
30-40 MINUTES
NO LESS THAN 60 MINUTES
DOESN’T NEED WARM UP
15-20 MINUTES
WHEN A THERMOSTATIC EXPANSION VALVE IS OPERATING PROPERLY, THE END OF THE COIL WILL CONTAIN
SATURATED VAPOR
SUPERHEATED VAPOR
LOW TEMPERATURE LIQUID
HOT VAPOR
SUPERHEATED VAPOR
IF 10 BTUs IS TRANSFERRED TO 10 LBS. OF WATER, THE INCREASE IN TEMPERATURE IS CLOSEST TO:
10°F
10°C
1°F
1°C
1°F
TO RAISE 10 LBS. OF WATER 1°F, HOW ANY BTUs DO YOU NEED?
1
5
20
10
10
To raise 10 lbs of water 1 degree F you need 10 BTUs
LIQUID LEVEL GAUGES (EXCEPT BULL’S EYE TYPE) SHALL HAVE SHUT OFF VALVES:
MANUAL ONLY
AUTOMATIC ONLY
VALVES NOT NEEDED
MANUAL AND AUTOMATIC
MANUAL AND AUTOMATIC
WHEN YOU ARE FINISHED LEAK TESTING WITH NITROGEN AND R-22, THEN THE NEXT STEP WOULD BE:
VENT REFRIGERANT AND NITROGEN TO OPEN AIR
REMOVE REFRIGERANT AND NITROGEN AT RECOVERY MACHINE
ADD REFRIGERANT
ADD REFRIGERANT IF NEEDED AND PUT SYSTEM BACK ONLINE
VENT REFRIGERANT AND NITROGEN TO OPEN AIR
WHAT WOULD BEST DESCRIBE THE REFRIGERANT IN THE LAST EVAPORATOR COIL?
VAPOR
SATURATED VAPOR
SUPERHEATED VAPOR
DRY VAPOR
SUPERHEATED VAPOR
WHAT IS A SUPERHEATED VAPOR?
VERY HIGH TEMPERATURE GAS MIXED WITH LIQUID
DRY VAPOR
DRY VAPOR AT ITS BOILING POINT
DRY VAPOR ABOVE ITS BOILING POINT
DRY VAPOR ABOVE ITS BOILING POINT
A RECIPROCATING COMPRESSOR SHAFT SEAL IS MADE UP OF:
PLASTIC
RUBBER
GRAPHITE FIBER HEMP
METAL
METAL
WHAT IS THE MAIN DISADVANTAGE OF THE SUCTION LINE FILTER DRIER COMPARED TO THE LIQUID LINE FILTER DRIER?
SUCTION LINE FILTER DRIER IS HARDER TO CHANGE THAN THE LIQUID LINE FILTER DRIER
IS LESS EFFICIENT THAN THE LIQUID LINE FILTER DRIER DUE TO DENSITY OF REFRIGERANT
SUCTION LINE FILTER DRIER IS TOO BIG AND BULKY
IF IT GETS CLOGGED THE SUCTION LINE FILTER DRIER REDUCES MORE OF THE CAPACITY OF THE COMPRESSOR THAN THE LIQUID LINE FILTER DRIER
IF IT GETS CLOGGED THE SUCTION LINE FILTER DRIER REDUCES MORE OF THE CAPACITY OF THE COMPRESSOR THAN THE LIQUID LINE FILTER DRIER
ON A CENTRIFUGAL WATER PUMP THE CONDITIONS ARE CORRECTLY PRIMED WHEN:
IT IS FULL OF WATER AND ALL AIR HAS BEEN PURGED OUT
WATER IS LEAKING FROM THE PACKING
THE PACKING WILL MAINTAIN THE WATER IN THE PUMP
NO REFRIGERANT IS LEAKING
IT IS FULL OF WATER AND ALL AIR HAS BEEN PURGED OUT
WHY CAN’T YOU USE A FLARE FITTING 3/4” OR LARGER?
CAN’T FLARE THAT LARGE
CAN’T TIGHTEN TO GET A GOOD SEAL
AGAINST THE LAW
EASIER TO SWEAT
CAN’T TIGHTEN TO GET A GOOD SEAL
AN OPEN TYPE COMPRESSOR IS KEEPING THE REFRIGERANT FROM ESCAPING BY TIGHTENING A SEAL MADE OF:
RUBBER
GRAPHITE LOADED FIBER
CARBON AND METAL
FORTIFIED PLASTIC
CARBON AND METAL
AFTER LEAK DETECTING WITH MOISTURE OF NITROGEN AND A TRACE OF R-22, THE RMO:
HAS TO RECOVER ONLY THE R-22
CAN VENT THE MIXTURE TO THE ATMOSPHERE
RECOVER BOTH INTO THE SAME CONTAINER
RECOVER BOTH, BUT IN SEPARATE CYLINDERS
CAN VENT THE MIXTURE TO THE ATMOSPHERE
IF YOU HAVE A 3 LINE CABLE SUPPLYING ENERGY TO YOUR EQUIPMENT, AND ONLY TWO LINES HAVE FUSES, THE UNFUSED LINE WOULD BE?
CONNECT THE EXTRA LINE TO MAKE 3 PHASE
2 UNFUSED WIRES DO NOT NEED TO BE INSULATED
THE NEUTRAL LINE OF A 120/240 CIRCUIT
THIS WOULD PRESENT AN UNSAFE CONDITION
THE NEUTRAL LINE OF A 120/240 CIRCUIT
WHAT IS THE TOTAL MAXIMUM AMOUNT OF REFRIGERANT YOU CAN STORE IN THE MACHINERY ROOM APART FROM YOUR REFRIGERANT IN YOUR MACHINE?
100 LBS
150 LBS
300 LBS
5 DRUMS
300 LBS
WHAT INFORMATION MUST BE STAMPED ON A FUSIBLE PLUG?
TYPE OF REFRIGERANT IT CAN BE USED WITH
MELTING POINT OF ALLOY
RELEASE PRESSURE
RESET PRESSURE
MELTING POINT OF ALLOY
WHEN WATER TURNS TO ICE, WHAT TAKES PLACE?
SUPERHEAT
HEAT OF FUSION
HEAT OF EVAPORATION
SUBCOOLING
HEAT OF FUSION
WHICH OF THE FOLLOWING ELECTRICAL COMPONENTS HAVE THE ABILITY TO STORE ELECTRICITY AND ARE SOMETIMES USED TO START MOTORS?
RESISTOR
RECTIFIER
GENERATOR
CAPACITOR
CAPACITOR
WHY IS GLYCOL A BETTER BRINE THAN SODIUM CHLORIDE?
MORE CONDUCTIVE
COST LESS
NO CORROSION
HIGHER FREEZING POINT
NO CORROSION
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?
SIGHTGLASS
THERMOSTAT
LOW PRESSURE CUT OUT, PRESSURE SWITCH
REFRIGERANT CHARGE
LOW PRESSURE CUT OUT, PRESSURE SWITCH
WHAT IS USED TO TRACK SPEED IN A STEAM TURBINE?
TACHOMETER
SPEEDOMETER
PEDOMETER
TRACKOMETER
TACHOMETER
YOU ARE USING COPPER TUBING TO REPLACE A PART OF A REFRIGERATION SYSTEM. WHAT IS USED TO BEND THE TUBING?
PIPE HICKEY
SPRING TYPE TUBE BENDER
VISE
PINCH BAR
SPRING TYPE TUBE BENDER
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?
GATE VALVE
BUTTERFLY VALVE OR PLUG VALVE
TWO WAY VALVE
THREE WAY VALVE
THREE WAY VALVE
THE TRUE POWER CONSUMED BY AN INDUCTION MOTOR CAN BEST BE DESCRIBED BY THE FOLLOWING FORMULA:
CURRENT x VOLTAGE x POWER FACTOR
CURRENT x VOLTAGE
VOLTAGE x RESISTANCE
CURRENT x RESISTANCE
CURRENT x VOLTAGE x POWER FACTOR
WHAT DOES A FILTER DRIER DO?
REMOVES PARTICLES
REMOVES MOISTURE
REMOVES ACID
ALL OF THE ABOVE
ALL OF THE ABOVE
A COMPRESSOR THAT USES A SHAFT WITH A MECHANICAL SEAL, WHAT IS THE VALVE PLATE MADE OF?
METAL/CARBON
PLASTIC
RUBBER
SILICON
METAL/CARBON
REGARDLESS OF THE SAFETY CLASSIFICATION OF THE REFRIGERANT IN USE, IN THE EVENT OF REFRIGERANT ESCAPE, THE RMO SHOULD BE AWARE OF:
A REFRIGERANT FIRE
REFRIGERANT POISONING
OXYGEN DEPRIVATION
ATMOSPHERIC SUPERHEATING
OXYGEN DEPRIVATION
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