TPC 431 Flashcards
REFRIGERATION IS THE PROCESS OF _______ THE AIR IN A DEFINED SPACE
LOWERING THE TEMPERATURE OF
THE TEMP. OF A MATERIAL DECREASES IF THE MATERIAL _______AND NOTHING ELSE HAPPENS THAT WOULD HAVE THE OPPOSITE EFFECT
CONTACTS A COOLER MATERIAL
THE 2 KINDS OF AIR CONDITIONING ARE
COMFORT AND PROCESS
ONE OF THE PHYSICAL STATES OF MATTER IS
GAS
YOU CAN CAUSE MATTER TO CHANGE ITS PHYSICAL STATE BY
ADDING OR REMOVING HEAT
THERMAL ENERGY THAT IS DIRECTLY RELATED TO THE TEMPERATURE OF A MATERIAL IS CALLED _________ HEAT.
SENSIBLE
A TEMPERATURE OF 45 IS ABOUT THE SAME AS ________C
7
HEAT CAN BE TRANSFERRED FROM ONE PLACE TO ANOTHER BY THE PROCESS OF
CONDUCTION
THE LATENT HEAT OF VAPORIZATION OF A SUBSTANCE IS THE AMOUNT OF HEAT THE SUBSTANCE ABSORBS AS IT
EVAPORATES
A REFRIGERATION SYSTEM HAS BEEN TURNED OFF FOR SEVERAL DAYS. IT CONTAINS BOTH LIQUID REFRIGERANT AND VAPOR. SUDDENLY A LINE CONTAINING THE REFRIGERANT BREAKS. WHAT HAPPENS INSIDE THE SYSTEM
THE LIQUID REFRIGERANT BOILS
FROM THE COMPRESSOR REFRIGERANT FLOWS TO THE
CONDENSOR
THE GRAPH BELOW IS THE PRESSURE-TEMPERATURE CHART FOR A REFRIGERANT. POINT ___REPRESENTS A CONDITION OF SUPERHEATING
1
COMPARED TO A DRY-EXPANSION EVAPORATOR A FLOODED EVAPORATOR OF THE SAME SIZE
IS MORE EFFICIENT
THE PURPOSE OF A COOLING MEDIUM IS TO
REMOVE HEAT FROM COMPRESSED REFRIGERANT VAPOR
AN AUTO EXPANSION VALVE IS A METERING DEVICE THAT MAINTAINS A CONSTANT PRESSURE IN THE
EVAPORATOR
THE PROPERTIES OF AIR THAT ARE IMPORTANT IN PSYCHROMETRICS INCLUDE
ENTHALPY
IN A SLING PSYCHROMETER THE WET BULB TEMP. IS USUALLY LOWER THAN THE DRY-BULB. IF THE DIFFERENCE IS VERY SMALL YOU KNOW THAT THE AIR IS QUITE
HUMID
AIR THAT IS SATURATED IS AIR THAT IS AT THE
DEWPOINT TEMP.
RELATIVE HUMIDITY CHANGES IF THE ______ CHANGES, BUT THE SPECIFIC HUMIDITY DOES NOT
DRY-BULB TEMP.
TO CALCULATE THE ENTHALPY OF A SAMPLE OF AIR YOU MUST INCLUDE
LATENT HEAT OF THE WATER VAPOR
IN ORDER TO REMOVE THE MOISTURE THAT ENTERS A REFRIGERATION SYSTEM DURING REPAIR, YOU MUST EVACUATE THE SYSTEM BY USING A ________ TO MAKE ALL THE MOISTURE VAPORIZE
VACUUM PUMP
ONE USEFUL METHOD OF DETECTING LEAKS IN A REFRIGERATION SYSTEM INVOLVES USING A _____ LEAK DETECTOR
ELECTRONIC
RELATIVE HUMIDITY CAN BE MEASURED DIRECTLY WITH A
HYGROMETER
WHICH OF THE FOLLOWING IS A CORRECT MATCH BETWEEN AN ELECTRICAL VALUE AND THE INSTRUMENT USED TO MEASURE IT
RESISTANCE;OHMMETER
IN THE LIST BELOW IDENTIFY THE LINE THAT CORRECTLY MATCHES ONE OF THE CLASSES OF WORK-AREA HAZARD TO AN EXAMPLE OF THAT CLASS OF HAZARD
CHEMICAL;CONTAINER OF REFRIGERANT
