HVAC Air Condition ESCO 2025 EXAM questions
with Correct Verified Answers
Heat which causes a change in temperature of a substance is called - ANS Sensible Heat
Heat added to a substance without a rise in temperature is called - ANS Latent Heat
Heat added to refrigerant in a vapor state after the evaporation process is called - ANS
Superheat
A scroll compressor moved refrigerant by means of - ANS Involute spirals
The movement of heat by way of fluid is called - ANS Convection
The movement of heat through a solid object is called - ANS Conduction
The standard unit for measuring the quantity of heat in a substance - ANS British
Thermal Unit
A refrigerant gives up heat when it - ANS Condenses
Why must refrigerant in the suction line be slightly warmer than the saturation
temperature? - ANS Prevent liquid slugging of compressor
It is desirable for refrigerant in the suction line to be slightly superheated in order to -
ANS Insure liquid refrigerant does not enter the compressor
, A mechanical shaft seal is necessary on - ANS Semi-hermetic compressor
Liquid slugging is - ANS Liquid refrigerant in the compressor clearance space
The clearance space in a reciprocating compressor - ANS Varies depending on
compressor speed
Which of the following types of air conditioning compressors is most energy efficient -
ANS Centrifugal
Which of the following represent the right order for the functions of a condenser? - ANS
De-superheat, condenses, sub-cools
Refrigerant R-134a vapor enters the compressor at 124 psig, 100°f. It leaves as a liquid
from the condenser sub-cooled 20°f, and the pressure will approximately - ANS 18.4 psig
There are 3 basic types of condensers, the air cooled, the water cooled, and the
_______ cooled - ANS Evaporative
10 lbs. of refrigerant passing through a water cooled condenser will lose 20 BTU's of
heat per lb. If 10 lbs. of water passes through the condenser with an entering
temperature of 80°f. The temperature of the water leaving the condenser is - ANS 100°f
The heat removed from the refrigerant by the condenser is - ANS Both sensible and
latent heat
An energy recovery ventilator is - ANS An air to air heat exchanger to recover heat
with Correct Verified Answers
Heat which causes a change in temperature of a substance is called - ANS Sensible Heat
Heat added to a substance without a rise in temperature is called - ANS Latent Heat
Heat added to refrigerant in a vapor state after the evaporation process is called - ANS
Superheat
A scroll compressor moved refrigerant by means of - ANS Involute spirals
The movement of heat by way of fluid is called - ANS Convection
The movement of heat through a solid object is called - ANS Conduction
The standard unit for measuring the quantity of heat in a substance - ANS British
Thermal Unit
A refrigerant gives up heat when it - ANS Condenses
Why must refrigerant in the suction line be slightly warmer than the saturation
temperature? - ANS Prevent liquid slugging of compressor
It is desirable for refrigerant in the suction line to be slightly superheated in order to -
ANS Insure liquid refrigerant does not enter the compressor
, A mechanical shaft seal is necessary on - ANS Semi-hermetic compressor
Liquid slugging is - ANS Liquid refrigerant in the compressor clearance space
The clearance space in a reciprocating compressor - ANS Varies depending on
compressor speed
Which of the following types of air conditioning compressors is most energy efficient -
ANS Centrifugal
Which of the following represent the right order for the functions of a condenser? - ANS
De-superheat, condenses, sub-cools
Refrigerant R-134a vapor enters the compressor at 124 psig, 100°f. It leaves as a liquid
from the condenser sub-cooled 20°f, and the pressure will approximately - ANS 18.4 psig
There are 3 basic types of condensers, the air cooled, the water cooled, and the
_______ cooled - ANS Evaporative
10 lbs. of refrigerant passing through a water cooled condenser will lose 20 BTU's of
heat per lb. If 10 lbs. of water passes through the condenser with an entering
temperature of 80°f. The temperature of the water leaving the condenser is - ANS 100°f
The heat removed from the refrigerant by the condenser is - ANS Both sensible and
latent heat
An energy recovery ventilator is - ANS An air to air heat exchanger to recover heat
