ESCO Air Conditioning Exam with All Correct & 100%
Verified Answers |Latest Update| Already Graded A+
Heat which causes a change in temperature of a substance is called ✔Correct Answer-Sensible
heat
Heat added to a substance without a rise in temperature ✔Correct Answer-Latent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called ✔Correct
Answer-Superheat
Scroll compressor move refrigerant by ✔Correct Answer-Involute Spirals
The movement of heat by way of fluid is called ✔Correct Answer-Convection
The movement of heat by direct contact is ✔Correct Answer-Conduction
The standard unit for measuring the quantity of heat in a substance is ✔Correct Answer-BTUs
Refrigerant gives up heat when ✔Correct Answer-It condenses
Why must refrigerant in the suction line be slightly warmer than the saturation temperature?
✔Correct Answer-Prevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be ✔Correct Answer-Low pressure / Low
temperature vapor
The state of the refrigerant entering the condenser is ✔Correct Answer-High pressure / Highly
superheated vapor
The evaporator ✔Correct Answer-Transfers heat from the refrigerated space to the refrigerant
Which of the following is not a thermodynamic property of refrigerants ✔Correct Answer-
Flammability
The sequential order of steps in the vapor compressions process are ✔Correct Answer-
Compression, Condensation, Expansion, Vaporization
If a 30 pound cylinder of reclaimed R 410 a refrigerant has been stored overnight at 70° the pressure
in the cylinder should be approximately ✔Correct Answer-201 psig
Fan airflow pressures are usually measured in ✔Correct Answer-Inches of water column
0 pounds per square inch absolute is ✔Correct Answer-A pressure which cannot be further
reduced
0 pounds per square inch gauge is ✔Correct Answer-The same as atmospheric pressure
, The temperature at which moisture will start to condense from the air is called ✔Correct Answer-
Dew point temperature
A compound pressure gauge measures ✔Correct Answer-Pressure and vacuum
Mechanical shaft seal is necessary on a ✔Correct Answer-Open drive compressor
Liquid slugging is ✔Correct Answer-Liquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor ✔Correct Answer-Has an effect on compressor
capacity
Which of the following types of air conditioning compressor is most energy-efficient ✔Correct
Answer-Scroll
Which of the following represent the right order for the functions of a condenser ✔Correct
Answer-De-superheat, Condenses, Subcools
Refrigerant R 134a vapor enters the condenser at 124 psi G, 100°F. it leaves as a liquid from the
condenser subcooled 20°F and the pressure will be approximately ✔Correct Answer-87 psig
There are three basic types of condensers, air-cooled, water-cooled and the _____________ cooled
✔Correct Answer-Evaporative
10 pounds of refrigerant passing through a water cooled condenser will lose 20 BTUs of heat per
pound. If 10 pounds of water passes through the condenser with an entering temperature of 80°F
the temperature of the water leaving the condenser is ✔Correct Answer-100°F
The heat removed from the refrigerant by the condenser is ✔Correct Answer-Both sensible and
latent heat.
An energy recovery ventilator is ✔Correct Answer-an air to air heat exchanger to recover heat
When testing the efficiency of an air-cooled condenser, the refrigerant condensing temperature
should be approximately ________ higher than the entering air temperature ✔Correct Answer-
30°F
When testing the efficiency of a water-cooled condenser, the refrigerant condensing temperature
should be approximately _________ higher than the leaving water temperature ✔Correct
Answer-10°F
The first function condenser must perform is to ✔Correct Answer-De-superheat
A thermostatic expansion valve is designed to maintain ✔Correct Answer-Constant evaporator
superheat
The automatic expansion valve is designed to maintain ✔Correct Answer-Constant evaporator
pressure
Verified Answers |Latest Update| Already Graded A+
Heat which causes a change in temperature of a substance is called ✔Correct Answer-Sensible
heat
Heat added to a substance without a rise in temperature ✔Correct Answer-Latent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called ✔Correct
Answer-Superheat
Scroll compressor move refrigerant by ✔Correct Answer-Involute Spirals
The movement of heat by way of fluid is called ✔Correct Answer-Convection
The movement of heat by direct contact is ✔Correct Answer-Conduction
The standard unit for measuring the quantity of heat in a substance is ✔Correct Answer-BTUs
Refrigerant gives up heat when ✔Correct Answer-It condenses
Why must refrigerant in the suction line be slightly warmer than the saturation temperature?
✔Correct Answer-Prevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be ✔Correct Answer-Low pressure / Low
temperature vapor
The state of the refrigerant entering the condenser is ✔Correct Answer-High pressure / Highly
superheated vapor
The evaporator ✔Correct Answer-Transfers heat from the refrigerated space to the refrigerant
Which of the following is not a thermodynamic property of refrigerants ✔Correct Answer-
Flammability
The sequential order of steps in the vapor compressions process are ✔Correct Answer-
Compression, Condensation, Expansion, Vaporization
If a 30 pound cylinder of reclaimed R 410 a refrigerant has been stored overnight at 70° the pressure
in the cylinder should be approximately ✔Correct Answer-201 psig
Fan airflow pressures are usually measured in ✔Correct Answer-Inches of water column
0 pounds per square inch absolute is ✔Correct Answer-A pressure which cannot be further
reduced
0 pounds per square inch gauge is ✔Correct Answer-The same as atmospheric pressure
, The temperature at which moisture will start to condense from the air is called ✔Correct Answer-
Dew point temperature
A compound pressure gauge measures ✔Correct Answer-Pressure and vacuum
Mechanical shaft seal is necessary on a ✔Correct Answer-Open drive compressor
Liquid slugging is ✔Correct Answer-Liquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor ✔Correct Answer-Has an effect on compressor
capacity
Which of the following types of air conditioning compressor is most energy-efficient ✔Correct
Answer-Scroll
Which of the following represent the right order for the functions of a condenser ✔Correct
Answer-De-superheat, Condenses, Subcools
Refrigerant R 134a vapor enters the condenser at 124 psi G, 100°F. it leaves as a liquid from the
condenser subcooled 20°F and the pressure will be approximately ✔Correct Answer-87 psig
There are three basic types of condensers, air-cooled, water-cooled and the _____________ cooled
✔Correct Answer-Evaporative
10 pounds of refrigerant passing through a water cooled condenser will lose 20 BTUs of heat per
pound. If 10 pounds of water passes through the condenser with an entering temperature of 80°F
the temperature of the water leaving the condenser is ✔Correct Answer-100°F
The heat removed from the refrigerant by the condenser is ✔Correct Answer-Both sensible and
latent heat.
An energy recovery ventilator is ✔Correct Answer-an air to air heat exchanger to recover heat
When testing the efficiency of an air-cooled condenser, the refrigerant condensing temperature
should be approximately ________ higher than the entering air temperature ✔Correct Answer-
30°F
When testing the efficiency of a water-cooled condenser, the refrigerant condensing temperature
should be approximately _________ higher than the leaving water temperature ✔Correct
Answer-10°F
The first function condenser must perform is to ✔Correct Answer-De-superheat
A thermostatic expansion valve is designed to maintain ✔Correct Answer-Constant evaporator
superheat
The automatic expansion valve is designed to maintain ✔Correct Answer-Constant evaporator
pressure
