1
Air conditioning Certification practice questions with
Correct solutions 2024 latest updated 100%.
What is the movement of heat through space called? - Precise answer Radiation
A refrigerant release heat when - Precise answer It condenses
Why is it desirable for refrigerant in the suction line to be slightly superheated? - Precise answer
To insure liquid refrigerant does not enter the compressor
A 30 pound cylinder of reclaimed R-22 refrigerant has been stored over night at 70 degrees F.
What should be the approximate pressure in the cylinder? - Precise answer 121 psig
14.7 psia( pouds per square inch absolute) is - Precise answer Approximately 0 PSIG
What is the main fuction of an air condition condenser? - Precise answer To remove heat from
the refrigerant
Refrigerant R-134a vapor enters the condenser at 124 psig, 100 degrees F. It leaves the
condenser at 80 degreesF. What will be the approximate pressure? - Precise answer 124 psig
(the pressure should not change entering or leaving the condenser)
Which of the following CANNOT be used as a low ambient temperature control? - Precise
answer Crankcase regulating valve
When testing the efficiency of a (10 seer are lower) air cooled condenser, the refrigerant
condensing temperature should be no more than_______ higher than the entering air temperature
- Precise answer Approximately 30 degrees F
When testing the efficiency of a water cooled condenser, the refrigerant condensing temperature
should be no more _____ higher than the leaving water temperature. - Precise answer 10
degrees F
What does a temperature differential across a filter-drier indicate? - Precise answer Restricted
filter-drier
Which of the following symptoms would be indicative of an oil logged evaporator? - Precise
answer Reduce heat transfer through the walls of the coil
When using an electronic leak detecto, the sensor probe - Precise answer should be moved at
approximately 1 inch per second
Before a vapor / compression system is opened for service - Precise answer the refrigerant must
be recovered using approved equipment
, 2
What is the minimum vertical drop from the outlet of the condensate drain pan to the inlet of the
P trap when the evaporator is ahead of the blower? - Precise answer 3 inches
The temperature rise method of determining air volume CFM is mostly used with a/an; - Precise
answer electric resistive heat air handler
What is a sling psychrometer used to measure - Precise answer wet and dry bulb temperature
A compressor is operating with a discharge pressure of 235.3 psig and a suction pressure of 35.3
psig. What is the compression ratio (pumping ratio)? - Precise answer 5:1 (235.3+14.7=250)
and (35.3+14.7=50) so 250/5=5
What method does hot gas bypass refer to? - Precise answer Capacity control
IF a TEV sensing bulb has lost of its charge, What effect would this have on the air conditioning
system - Precise answer It would cause the low side pressure to decrease
An increase in water flow, when using a water cooled condenser, would - Precise answer
decrease the operating discharge pressure
The clearance space in reciprocating compressor - Precise answer has an effect on compressor
capacity
What is used to control the flow of water on a water-cooled condenser? - Precise answer A
water regulating valve
How should metallic vibration eliminators be installed on a system which uses a reciprocating
compressor? - Precise answer parallel to the compressor crankshaft
The total amount of heat contained in one pound of a substance calculated from an accepted
temperature base is called - Precise answer enthalpy
If non-condensables are trapped in a condenser, what symptoms will be present? - Precise
answer Increased heat build-up, high amperage and high discharge pressure.
Many multi-cylinder reciprocating compressor have a capacity control device called; - Precise
answer un-loaders
A pilot-operated pressure regulator uses_________ pressure to operate the valve. - Precise
answer suction gas
A low-side float metering device is used________. - Precise answer on a flooded evaporator
In a direct expansion (DX) evaporator system, refrigerant leaves the evaporator as ______. -
Precise answer superheated vapor
Air conditioning Certification practice questions with
Correct solutions 2024 latest updated 100%.
What is the movement of heat through space called? - Precise answer Radiation
A refrigerant release heat when - Precise answer It condenses
Why is it desirable for refrigerant in the suction line to be slightly superheated? - Precise answer
To insure liquid refrigerant does not enter the compressor
A 30 pound cylinder of reclaimed R-22 refrigerant has been stored over night at 70 degrees F.
What should be the approximate pressure in the cylinder? - Precise answer 121 psig
14.7 psia( pouds per square inch absolute) is - Precise answer Approximately 0 PSIG
What is the main fuction of an air condition condenser? - Precise answer To remove heat from
the refrigerant
Refrigerant R-134a vapor enters the condenser at 124 psig, 100 degrees F. It leaves the
condenser at 80 degreesF. What will be the approximate pressure? - Precise answer 124 psig
(the pressure should not change entering or leaving the condenser)
Which of the following CANNOT be used as a low ambient temperature control? - Precise
answer Crankcase regulating valve
When testing the efficiency of a (10 seer are lower) air cooled condenser, the refrigerant
condensing temperature should be no more than_______ higher than the entering air temperature
- Precise answer Approximately 30 degrees F
When testing the efficiency of a water cooled condenser, the refrigerant condensing temperature
should be no more _____ higher than the leaving water temperature. - Precise answer 10
degrees F
What does a temperature differential across a filter-drier indicate? - Precise answer Restricted
filter-drier
Which of the following symptoms would be indicative of an oil logged evaporator? - Precise
answer Reduce heat transfer through the walls of the coil
When using an electronic leak detecto, the sensor probe - Precise answer should be moved at
approximately 1 inch per second
Before a vapor / compression system is opened for service - Precise answer the refrigerant must
be recovered using approved equipment
, 2
What is the minimum vertical drop from the outlet of the condensate drain pan to the inlet of the
P trap when the evaporator is ahead of the blower? - Precise answer 3 inches
The temperature rise method of determining air volume CFM is mostly used with a/an; - Precise
answer electric resistive heat air handler
What is a sling psychrometer used to measure - Precise answer wet and dry bulb temperature
A compressor is operating with a discharge pressure of 235.3 psig and a suction pressure of 35.3
psig. What is the compression ratio (pumping ratio)? - Precise answer 5:1 (235.3+14.7=250)
and (35.3+14.7=50) so 250/5=5
What method does hot gas bypass refer to? - Precise answer Capacity control
IF a TEV sensing bulb has lost of its charge, What effect would this have on the air conditioning
system - Precise answer It would cause the low side pressure to decrease
An increase in water flow, when using a water cooled condenser, would - Precise answer
decrease the operating discharge pressure
The clearance space in reciprocating compressor - Precise answer has an effect on compressor
capacity
What is used to control the flow of water on a water-cooled condenser? - Precise answer A
water regulating valve
How should metallic vibration eliminators be installed on a system which uses a reciprocating
compressor? - Precise answer parallel to the compressor crankshaft
The total amount of heat contained in one pound of a substance calculated from an accepted
temperature base is called - Precise answer enthalpy
If non-condensables are trapped in a condenser, what symptoms will be present? - Precise
answer Increased heat build-up, high amperage and high discharge pressure.
Many multi-cylinder reciprocating compressor have a capacity control device called; - Precise
answer un-loaders
A pilot-operated pressure regulator uses_________ pressure to operate the valve. - Precise
answer suction gas
A low-side float metering device is used________. - Precise answer on a flooded evaporator
In a direct expansion (DX) evaporator system, refrigerant leaves the evaporator as ______. -
Precise answer superheated vapor
