MKC STUDY GUIDE WITH
VERIFIED ANSWERS
WHICH REFRIGERATION SYSTEM COMPONENTS SERVE TO MAKE IT POSSIBLE TO REUSE THE SAME
REFRIGERANT OVER AND OVER AGAIN✔ans COMPRESSOR AND CONDENSER
IN THE DESIGN OF THE HERMETIC COMPRESSORS, A MAJOR PROBLEM IS THE✔ans COOLING OF THE
ELECTRIC MOTOR
IN A REFRIGERATION SYSTEM, THE DEHYDRATOR IS PRIMARILY INTENDED FOR USE IN THE ____
SYSTEM✔ans CHARGING
IN A REFRIGERATION PLANT, WHERE DOES THE REFRIGERATING EFFECT TAKE PLACE✔ans EVAPORATOR
WHAT IS THE MOST COMMON PIPING MATERIAL USED IN MODERN SHIPBOARD AIR CONDITIONING
PLANTS✔ans COPPER PIPING
IN WATER COOLED CONDENSERS, IF HEAVY DEPOSITS OF FOREIGN MATTER ARE PRESENT, YOU SHOULD
USE WHAT TO REMOVE IT✔ans AN AIR OR WATER LANCE, ENSURING THAT NYLON OR OTHER FIBER
BRISTLES ARE USED
WHAT MUST BE USED TO CLEAN REFRIGERATOR DOOR GASKETS✔ans SOAPY WATER
THE OPERATING LOG SERVES AS A GUIDE TO THE✔ans CONDITION OF THE PLANT
WHAT IS THE SMALLEST PARTICLE OF MATTER✔ans ATOM
HEAT THAT CAN BE FELT OR MEASURED IS REFERRED TO AS✔ans SENSIBLE HEAT
,THE REFRIGERANT IS UNDER HIGH PRESSURE IN A REFRIGERANT SYSTEM WHERE✔ans BETWEEN THE
COMPRESSOR AND METERING DEVICE
A CHANGE OF STATE FROM A SOLID TO A VAPOR WITHOUT PASSING THROUGH THE LIQUID STATE IS
CALLED✔ans SUBLIMATION
WHEN FLARING A PIECE OF COPPER TUBING, HOW FAR SHOULD THE TUBING EXTEND ABOVE THE FLARE
BLOCK✔ans APPROXIMATELY 1/3 ABOVE THE HEIGHT OF THE FLARE
THE CORRECT OXYACETYLENE FLAME FOR BRAZING IS CALLED✔ans A NEUTRAL FLAME
WHAT TYPE OF SOLDERING IS THE ONLY TYPE RECOMMENDED FOR USE IN REFRIGERANT SYSTEMS✔ans
HARD SOLDERING, ALSO KNOWN AS SILVER SOLDERING. SOFT SOLDERING IS EXPRESSLY NOT
RECOMMENDED FOR USE IN REFRIGERANT SYSTEMS
WHAT IS THE MAXIMUM SYSTEM PRESSURE ALLOWED WHEN USING SILVER (HARD) SOLDERING✔ans
3000 PSI
THE COMPONENT OF THE REFRIGERANT SYSTEM WHERE HEAT IS REMOVED FROM THE PRODUCT BEING
COOLED, IE. WATER OR AIR IS CALLED✔ans THE EVAPORATOR
WHAT IS THE BASIC PURPOSE OF THE THERMOSTATIC EXPANSION VALVE✔ans TO MAINTAIN AN AMPLE
SUPPLY OF REFRIGERANT IN THE EVAPORATOR, WITHOUT ALLOWING LIQUID REFRIGERANT TO PASS
INTO THE COMPRESSOR
WHEN REFRIGERANT COMES INTO CONTACT WITH THE HALIDE LEAK DETECTOR, WHAT COLOR DOES
THE FLAME TURN✔ans BLUISH GREEN OR VIOLET IN COLOR
REFRIGERANT CYLINDERS SHOULD NEVER BE FILLED TO MORE THAN ______% OF THE CYLINDER
VOLUME✔ans 80%
REFRIGERANT CYLINDERS SHOULD NOT BE STORED ABOVE WHAT TEMPERATURE✔ans 130 DEGREES F
,WHERE WOULD YOU MOST LIKELY FIND A CAPILLARY TUBE IN PLACE OF A THERMOSTATIC EXPANSION
VALVE✔ans IN A SYSTEM WHERE THE LOAD IS FAIRLY CONSTANT SUCH AS REFRIGERATORS, FREEZERS
AND SMALL AIR CONDITIONERS
WHAT DO YOU DO WHEN A PERSON IS OVERCOME BY REFRIGERANT✔ans MOVE HIM IMMEDIATELY TO
A WELL VENTILATED AREA AND TREAT HIM FOR SUFFOCATION
IF YOU ARE CHARGING A REFRIGERANT SYSTEM ON THE SUCTION SIDE, HOW SHOULD THE
REFRIGERANT BE ADDED✔ans YOU SHOULD MAINTAIN THE CYLINDER IN AN UPRIGHT POSITION SO
THAT THE REFRIGERANT IS CHARGED AS A GAS
ON LARGE SUCTION LINES (7/8 INCH OD AND LARGER) THE THERMOSTATIC EXPANSION VALVE
THERMAL BULB SHOULD BE LOCATED WHERE✔ans IN A 4 O'CLOCK OR 8 O'CLOCK POSITION
REFRIGERANT IS IN A LIQUID STATE BETWEEN WHAT TWO A/C COMPONENTS✔ans CONDENSOR AND
THERMAL EXPANSION VALVE
WHAT IS THE BEST DESIGN FOR VACUUM PUMP HOSES✔ans AS SHORT IN LENGTH AND AS WIDE IN
DIAMETER AS POSSIBLE
WHAT ARE THE STEPS FOR TESTING AN A/C SYSTEM THAT HAS BEEN REPAIRED✔ans PRESSURIZE WITH
NITROGEN, THEN APPLY A VACUUM
WHAT IS THE MAXIMUM TEMP TO HOT FLUSH A PIPING SYSTEM?✔ans 100 F
WHAT WILL TAKE PLACE IF AN EVAPORATOR IS OPERATED IN AN OVERLOADED CONDITION?✔ans
INCREASED SCALE BUILD UP
WHAT IS THE PRIMARY PURPOSE OF THE CHILL SHOCKING OF THE TUBE NEST OF AN EVAPORATOR✔ans
TO COMBAT SCALE FORMATION
, MAGNETIC WATER TREATMENT IN BOILERS ELIMINATES THE NEED FOR✔ans ACTIVE SCALE REMOVAL
THE MOST FREQUENT CAUSE OF UNSTEADY VACUUM IN AN EVAPORATOR IS✔ans LACK OF STEAM
PRESSURE
WHAT COLOR SMOKE WOULD BE PRODUCED IN A BOILER WHEN TOO MUCH AIR IS INTRODUCED✔ans
WHITE
WHAT IS THE PURPOSE OF THE BAFFLES AND VANES IN THE EVAPORATOR SHELL✔ans TO SEPARATE THE
WATER PARTICLES FROM THE VAPOR
AFTER ENTERING THE FIRST EFFECT SHELL, SOME OF THE FEED WATER IS EVAPORATED. THE REST OF
THE FEED WATER (BRINE) IS FORCED INTO THE SECOND EFFECT SHELL BY✔ans FIRST EFFECT SHELL
PRESSURE
HOW OFTEN SHOULD AUXILIARY BOILER WATER GAGES BE BLOWN DOWN✔ans ONCE A WATCH
IN A FLASH TYPE DISTILLING PLANT, SALT WATER LEAKING INTO THE DISTILLATE OR CONDENSATE AT
ANY VARIOUS TUBE BUNDLE WILL IMMEDIATELY BE INDICATED BY✔ans AN ALARM
ON A FLASH TYPE DISTILLING PLANT (EVAPORATOR) THE MAXIMUM GRAINS PER GALLON OF
SALT/IMPURITIES ALLOWED TO PASS THROUGH THE SALINITY CELL IS✔ans .25 GPG OR BELOW
IF THE SALINITY CELL MONITOR ON AN EVAPORATOR DETECTS A SALINITY OR IMPURITY LEVEL ABOVE
.25 GRAINS PER GALLON, WHAT HAPPENS✔ans THE THREE WAY VALVE TRIPS ROUTING THE DISTILLATE
OVERBOARD AND THE ALARM SOUNDS
WHAT FITTING IS THE MOST IMPORTANT OF THE BOILER FITTINGS✔ans SAFETY VALVE
WITH WHAT DO YOU "TREAT" EVAPORATOR WATER?✔ans HAGEVAP OR AMEROYAL
VERIFIED ANSWERS
WHICH REFRIGERATION SYSTEM COMPONENTS SERVE TO MAKE IT POSSIBLE TO REUSE THE SAME
REFRIGERANT OVER AND OVER AGAIN✔ans COMPRESSOR AND CONDENSER
IN THE DESIGN OF THE HERMETIC COMPRESSORS, A MAJOR PROBLEM IS THE✔ans COOLING OF THE
ELECTRIC MOTOR
IN A REFRIGERATION SYSTEM, THE DEHYDRATOR IS PRIMARILY INTENDED FOR USE IN THE ____
SYSTEM✔ans CHARGING
IN A REFRIGERATION PLANT, WHERE DOES THE REFRIGERATING EFFECT TAKE PLACE✔ans EVAPORATOR
WHAT IS THE MOST COMMON PIPING MATERIAL USED IN MODERN SHIPBOARD AIR CONDITIONING
PLANTS✔ans COPPER PIPING
IN WATER COOLED CONDENSERS, IF HEAVY DEPOSITS OF FOREIGN MATTER ARE PRESENT, YOU SHOULD
USE WHAT TO REMOVE IT✔ans AN AIR OR WATER LANCE, ENSURING THAT NYLON OR OTHER FIBER
BRISTLES ARE USED
WHAT MUST BE USED TO CLEAN REFRIGERATOR DOOR GASKETS✔ans SOAPY WATER
THE OPERATING LOG SERVES AS A GUIDE TO THE✔ans CONDITION OF THE PLANT
WHAT IS THE SMALLEST PARTICLE OF MATTER✔ans ATOM
HEAT THAT CAN BE FELT OR MEASURED IS REFERRED TO AS✔ans SENSIBLE HEAT
,THE REFRIGERANT IS UNDER HIGH PRESSURE IN A REFRIGERANT SYSTEM WHERE✔ans BETWEEN THE
COMPRESSOR AND METERING DEVICE
A CHANGE OF STATE FROM A SOLID TO A VAPOR WITHOUT PASSING THROUGH THE LIQUID STATE IS
CALLED✔ans SUBLIMATION
WHEN FLARING A PIECE OF COPPER TUBING, HOW FAR SHOULD THE TUBING EXTEND ABOVE THE FLARE
BLOCK✔ans APPROXIMATELY 1/3 ABOVE THE HEIGHT OF THE FLARE
THE CORRECT OXYACETYLENE FLAME FOR BRAZING IS CALLED✔ans A NEUTRAL FLAME
WHAT TYPE OF SOLDERING IS THE ONLY TYPE RECOMMENDED FOR USE IN REFRIGERANT SYSTEMS✔ans
HARD SOLDERING, ALSO KNOWN AS SILVER SOLDERING. SOFT SOLDERING IS EXPRESSLY NOT
RECOMMENDED FOR USE IN REFRIGERANT SYSTEMS
WHAT IS THE MAXIMUM SYSTEM PRESSURE ALLOWED WHEN USING SILVER (HARD) SOLDERING✔ans
3000 PSI
THE COMPONENT OF THE REFRIGERANT SYSTEM WHERE HEAT IS REMOVED FROM THE PRODUCT BEING
COOLED, IE. WATER OR AIR IS CALLED✔ans THE EVAPORATOR
WHAT IS THE BASIC PURPOSE OF THE THERMOSTATIC EXPANSION VALVE✔ans TO MAINTAIN AN AMPLE
SUPPLY OF REFRIGERANT IN THE EVAPORATOR, WITHOUT ALLOWING LIQUID REFRIGERANT TO PASS
INTO THE COMPRESSOR
WHEN REFRIGERANT COMES INTO CONTACT WITH THE HALIDE LEAK DETECTOR, WHAT COLOR DOES
THE FLAME TURN✔ans BLUISH GREEN OR VIOLET IN COLOR
REFRIGERANT CYLINDERS SHOULD NEVER BE FILLED TO MORE THAN ______% OF THE CYLINDER
VOLUME✔ans 80%
REFRIGERANT CYLINDERS SHOULD NOT BE STORED ABOVE WHAT TEMPERATURE✔ans 130 DEGREES F
,WHERE WOULD YOU MOST LIKELY FIND A CAPILLARY TUBE IN PLACE OF A THERMOSTATIC EXPANSION
VALVE✔ans IN A SYSTEM WHERE THE LOAD IS FAIRLY CONSTANT SUCH AS REFRIGERATORS, FREEZERS
AND SMALL AIR CONDITIONERS
WHAT DO YOU DO WHEN A PERSON IS OVERCOME BY REFRIGERANT✔ans MOVE HIM IMMEDIATELY TO
A WELL VENTILATED AREA AND TREAT HIM FOR SUFFOCATION
IF YOU ARE CHARGING A REFRIGERANT SYSTEM ON THE SUCTION SIDE, HOW SHOULD THE
REFRIGERANT BE ADDED✔ans YOU SHOULD MAINTAIN THE CYLINDER IN AN UPRIGHT POSITION SO
THAT THE REFRIGERANT IS CHARGED AS A GAS
ON LARGE SUCTION LINES (7/8 INCH OD AND LARGER) THE THERMOSTATIC EXPANSION VALVE
THERMAL BULB SHOULD BE LOCATED WHERE✔ans IN A 4 O'CLOCK OR 8 O'CLOCK POSITION
REFRIGERANT IS IN A LIQUID STATE BETWEEN WHAT TWO A/C COMPONENTS✔ans CONDENSOR AND
THERMAL EXPANSION VALVE
WHAT IS THE BEST DESIGN FOR VACUUM PUMP HOSES✔ans AS SHORT IN LENGTH AND AS WIDE IN
DIAMETER AS POSSIBLE
WHAT ARE THE STEPS FOR TESTING AN A/C SYSTEM THAT HAS BEEN REPAIRED✔ans PRESSURIZE WITH
NITROGEN, THEN APPLY A VACUUM
WHAT IS THE MAXIMUM TEMP TO HOT FLUSH A PIPING SYSTEM?✔ans 100 F
WHAT WILL TAKE PLACE IF AN EVAPORATOR IS OPERATED IN AN OVERLOADED CONDITION?✔ans
INCREASED SCALE BUILD UP
WHAT IS THE PRIMARY PURPOSE OF THE CHILL SHOCKING OF THE TUBE NEST OF AN EVAPORATOR✔ans
TO COMBAT SCALE FORMATION
, MAGNETIC WATER TREATMENT IN BOILERS ELIMINATES THE NEED FOR✔ans ACTIVE SCALE REMOVAL
THE MOST FREQUENT CAUSE OF UNSTEADY VACUUM IN AN EVAPORATOR IS✔ans LACK OF STEAM
PRESSURE
WHAT COLOR SMOKE WOULD BE PRODUCED IN A BOILER WHEN TOO MUCH AIR IS INTRODUCED✔ans
WHITE
WHAT IS THE PURPOSE OF THE BAFFLES AND VANES IN THE EVAPORATOR SHELL✔ans TO SEPARATE THE
WATER PARTICLES FROM THE VAPOR
AFTER ENTERING THE FIRST EFFECT SHELL, SOME OF THE FEED WATER IS EVAPORATED. THE REST OF
THE FEED WATER (BRINE) IS FORCED INTO THE SECOND EFFECT SHELL BY✔ans FIRST EFFECT SHELL
PRESSURE
HOW OFTEN SHOULD AUXILIARY BOILER WATER GAGES BE BLOWN DOWN✔ans ONCE A WATCH
IN A FLASH TYPE DISTILLING PLANT, SALT WATER LEAKING INTO THE DISTILLATE OR CONDENSATE AT
ANY VARIOUS TUBE BUNDLE WILL IMMEDIATELY BE INDICATED BY✔ans AN ALARM
ON A FLASH TYPE DISTILLING PLANT (EVAPORATOR) THE MAXIMUM GRAINS PER GALLON OF
SALT/IMPURITIES ALLOWED TO PASS THROUGH THE SALINITY CELL IS✔ans .25 GPG OR BELOW
IF THE SALINITY CELL MONITOR ON AN EVAPORATOR DETECTS A SALINITY OR IMPURITY LEVEL ABOVE
.25 GRAINS PER GALLON, WHAT HAPPENS✔ans THE THREE WAY VALVE TRIPS ROUTING THE DISTILLATE
OVERBOARD AND THE ALARM SOUNDS
WHAT FITTING IS THE MOST IMPORTANT OF THE BOILER FITTINGS✔ans SAFETY VALVE
WITH WHAT DO YOU "TREAT" EVAPORATOR WATER?✔ans HAGEVAP OR AMEROYAL
