Refrigerated Machine Operate Exam
Questions with Latest Update
OF THE FOLLOWING CHARACTERISTICS OF REFRIGERANT, THE ONE THAT
BEST DESCRIBES REFRIGERANT 22 IS: - Answer-ODORLESS WHEN MIXED WITH
AIR
BECAUSE OF THE LATENT HEAT LOAD, REFRIGERATION MACHINE OPERATOR
WAS INSTRUCTED TO START THE RECIPROCATING PLANT FOR AIR
CONDITIONING. OF THE FOLLOWING ACCORDING TO RECOMMENDED
PRACTICE, THE FIRST THING TO DO IS - Answer-TURN ON CHILLED WATER
PUMP, CONDENSER WATER PUMPS AND COOLING TOWER FANS
THE MOST IMPORTANT REASON TO USE 2 COMPRESSORS IN A CASCADE
SYSTEM IS TO: - Answer-ACCOMPLISH LOWER TEMPERATURE
THE ADVANTAGE OF FORCED DRAFT OVER NATURAL DRAFT COOLING TOWER
IS: - Answer-THE POSSIBILITY OF LOWER WATER OUT TEMP,
THERE IS NO DEPENDENCE ON NATURAL WIND VELOCITY AND USE OF A
SMALLER TOWER SIZE
THE MECHANISM SITTING ABOVE THE EVAPORATOR IS KNOWN AS - Answer-
PURGE UNIT
THE RUPTURE DISK IS ALWAYS PIPED INTO THE - Answer-LOW SIDE
WHAT IS 29.92" HG IN KPA - Answer-101.3
CONCERNING LEAKAGE, WHICH STATEMENT IS MOST CORRECT? - Answer-
GATE VALVES CAUSES MORE LEAKAGE
WHAT SHAFT SEAL PREVENTS VAPOR FROM LEAKING OUT OF COMPRESSOR?
- Answer-STUFFING BOX
A FUSIBLE PLUG MELTS AT - Answer-280°F
WHEN WILL THE BTUs ABSORBED BY THE CONDENSING WATER BE THE
GREATEST? - Answer-HIGH CONDENSER TEMPERATURE, LOW CONDENSER
WATER TEMPERATURE
FLOODED EVAPORATORS HAVE HIGH HEAT TRANSFER PER SQUARE FOOT,
WHAT MAY BE A DISADVANTAGE? - Answer-REQUIRES A HIGHER CHARGE
, SHELL AND TUBE CONDENSERS HAVE THE ADVANTAGE OF: - Answer-
REMOVING HEADS FOR CLEANING THE WATER SIDES OF THE TUBES AND THE
REFRIGERANT CONNECTIONS DOES NOT HAVE TO BE DISRUPTED
SHELL AND COIL CONDENSERS HAVE THE ADVANTAGE OF: - Answer-HAS LESS
CHANCE OF DEVELOPING LEAKS
HOW MANY BTUs WOULD BE REMOVED IN A 30 TON SYSTEM? - Answer-360,000
PER HOUR
IF YOU HAVE 62 PSI AT 35°F AND 70 PSI AT 45°F, WHAT WOULD 38°F BE? -
Answer-64.4
COPPER IS USED IN REFRIGERATION SYSTEMS, LIKE IN HEAT EXCHANGERS,
BECAUSE? - Answer-HIGH THERMAL CONDUCTIVITY
THE ACCESSORIES ON THE LIQUID LINE ARE IN WHAT ORDER? - Answer-
RECEIVER, DRIER, SOLENOID VALVE, AND SIGHT-GLASS
A CONDENSER IS 20' LONG AND 6' IN DIAMETER, WHAT IS THE VOLUME IN
GALLONS IF 7.48 GALLONS IS 1 CU/FT? - Answer-4227
IF THE LOW PRESSURE CUTOUT CYCLES THE COMPRESSOR OFF, WHAT
STARTS THE COMPRESSOR AGAIN? - Answer-LOW PRESSURE CUT OUT
REMOVING THE INSULATION ON THE SUCTION LINE, WITH THE ENGINE
TEMPERATURE AT 85°F, WHAT WILL OCCUR? - Answer-EXCESSIVE SUPERHEAT
IF YOU WERE RUNNING THREE COMPRESSORS, WHICH BEST DESCRIBES THE
STATE OF REFRIGERANT LEAVING THE THIRD EVAPORATOR COIL? - Answer-
SUPERHEATED VAPOR
AN ELECTRIC MOTOR THAT IS RATED AT 3 HP WILL? - Answer-USE THREE
PHASE
IN A 3 STAGE CENTRIFUGAL CHILLER, WHAT HAPPENS TO THE PRESSURE AS
IT REACHES THE FINAL STAGE? - Answer-INCREASES
WITH AN INDUCED DRAFT COOLING TOWER, WHAT IS THE LOWEST
TEMPERATURE ATTAINABLE FOR A COOLING TOWER? - Answer-DRY BULB
HIGHER THAN WET BULB
WHEN A COMPRESSOR IS RUNNING FINE AT FULL FLOW AND YOU THROTTLE
DOWN FLOW CAUSING THE COMPRESSOR TO STOP RUNNING NORMAL
(SHORT CYCLE), WHY WOULD THIS HAPPEN? - Answer-LOW PRESSURE CUT
OUT
Questions with Latest Update
OF THE FOLLOWING CHARACTERISTICS OF REFRIGERANT, THE ONE THAT
BEST DESCRIBES REFRIGERANT 22 IS: - Answer-ODORLESS WHEN MIXED WITH
AIR
BECAUSE OF THE LATENT HEAT LOAD, REFRIGERATION MACHINE OPERATOR
WAS INSTRUCTED TO START THE RECIPROCATING PLANT FOR AIR
CONDITIONING. OF THE FOLLOWING ACCORDING TO RECOMMENDED
PRACTICE, THE FIRST THING TO DO IS - Answer-TURN ON CHILLED WATER
PUMP, CONDENSER WATER PUMPS AND COOLING TOWER FANS
THE MOST IMPORTANT REASON TO USE 2 COMPRESSORS IN A CASCADE
SYSTEM IS TO: - Answer-ACCOMPLISH LOWER TEMPERATURE
THE ADVANTAGE OF FORCED DRAFT OVER NATURAL DRAFT COOLING TOWER
IS: - Answer-THE POSSIBILITY OF LOWER WATER OUT TEMP,
THERE IS NO DEPENDENCE ON NATURAL WIND VELOCITY AND USE OF A
SMALLER TOWER SIZE
THE MECHANISM SITTING ABOVE THE EVAPORATOR IS KNOWN AS - Answer-
PURGE UNIT
THE RUPTURE DISK IS ALWAYS PIPED INTO THE - Answer-LOW SIDE
WHAT IS 29.92" HG IN KPA - Answer-101.3
CONCERNING LEAKAGE, WHICH STATEMENT IS MOST CORRECT? - Answer-
GATE VALVES CAUSES MORE LEAKAGE
WHAT SHAFT SEAL PREVENTS VAPOR FROM LEAKING OUT OF COMPRESSOR?
- Answer-STUFFING BOX
A FUSIBLE PLUG MELTS AT - Answer-280°F
WHEN WILL THE BTUs ABSORBED BY THE CONDENSING WATER BE THE
GREATEST? - Answer-HIGH CONDENSER TEMPERATURE, LOW CONDENSER
WATER TEMPERATURE
FLOODED EVAPORATORS HAVE HIGH HEAT TRANSFER PER SQUARE FOOT,
WHAT MAY BE A DISADVANTAGE? - Answer-REQUIRES A HIGHER CHARGE
, SHELL AND TUBE CONDENSERS HAVE THE ADVANTAGE OF: - Answer-
REMOVING HEADS FOR CLEANING THE WATER SIDES OF THE TUBES AND THE
REFRIGERANT CONNECTIONS DOES NOT HAVE TO BE DISRUPTED
SHELL AND COIL CONDENSERS HAVE THE ADVANTAGE OF: - Answer-HAS LESS
CHANCE OF DEVELOPING LEAKS
HOW MANY BTUs WOULD BE REMOVED IN A 30 TON SYSTEM? - Answer-360,000
PER HOUR
IF YOU HAVE 62 PSI AT 35°F AND 70 PSI AT 45°F, WHAT WOULD 38°F BE? -
Answer-64.4
COPPER IS USED IN REFRIGERATION SYSTEMS, LIKE IN HEAT EXCHANGERS,
BECAUSE? - Answer-HIGH THERMAL CONDUCTIVITY
THE ACCESSORIES ON THE LIQUID LINE ARE IN WHAT ORDER? - Answer-
RECEIVER, DRIER, SOLENOID VALVE, AND SIGHT-GLASS
A CONDENSER IS 20' LONG AND 6' IN DIAMETER, WHAT IS THE VOLUME IN
GALLONS IF 7.48 GALLONS IS 1 CU/FT? - Answer-4227
IF THE LOW PRESSURE CUTOUT CYCLES THE COMPRESSOR OFF, WHAT
STARTS THE COMPRESSOR AGAIN? - Answer-LOW PRESSURE CUT OUT
REMOVING THE INSULATION ON THE SUCTION LINE, WITH THE ENGINE
TEMPERATURE AT 85°F, WHAT WILL OCCUR? - Answer-EXCESSIVE SUPERHEAT
IF YOU WERE RUNNING THREE COMPRESSORS, WHICH BEST DESCRIBES THE
STATE OF REFRIGERANT LEAVING THE THIRD EVAPORATOR COIL? - Answer-
SUPERHEATED VAPOR
AN ELECTRIC MOTOR THAT IS RATED AT 3 HP WILL? - Answer-USE THREE
PHASE
IN A 3 STAGE CENTRIFUGAL CHILLER, WHAT HAPPENS TO THE PRESSURE AS
IT REACHES THE FINAL STAGE? - Answer-INCREASES
WITH AN INDUCED DRAFT COOLING TOWER, WHAT IS THE LOWEST
TEMPERATURE ATTAINABLE FOR A COOLING TOWER? - Answer-DRY BULB
HIGHER THAN WET BULB
WHEN A COMPRESSOR IS RUNNING FINE AT FULL FLOW AND YOU THROTTLE
DOWN FLOW CAUSING THE COMPRESSOR TO STOP RUNNING NORMAL
(SHORT CYCLE), WHY WOULD THIS HAPPEN? - Answer-LOW PRESSURE CUT
OUT
