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