HVAC ESCO Basic Test Review
A liquid to suction heat exchanger is often used to
A. Decrease Vapor Superheat
B. Increase liquid subcooling
C. Decrease head pressure
D. Increase Flash gas in the suction line - *answers *B. Increase liquid subcooling
The term, refrigerant conditions refer to which of the following
A. Saturated ,superheat, or subcooling refrigerant
B. Pressurized refrigerant only
C. A system in a complete vacuum
D. the outdoor ambient air temperature - *answers *A. Saturated, superheat, or
subcooling
The component in the refrigeration system used to catch and prevent liquid from
entering the compressor is called the
A. Liquid receiver
B. The accumulator
C. The oil separator
D. The filter dryer - *answers *B. The Accumulator
An air conditioning system or heat pump must have
A. 550-600 cubic feet of air per minute across the evaporator coil
B. 500-550 cubic feet of air per minute across the evaporator coil
C. 400-450 cubic feet of air per minute across the evaporator coil
D. Less than 400 cubic feet of air per minute across the evaporator coil - *answers *C.
400-450 cubic feet of air per minute across the evaporator coil
The refrigerant charge in a TXV remote bulb or power element must
A. Be changed when the filter dryer is changed
B. Have similar characteristics to the refrigerant in the system
C. Be discharged before it is effective
D. Have pressure similar to R-134A - *answers *B. Have similar characteristics to the
refrigerant in the system
The remote bulb of a TXV should be fastened to the
A. Outlet of the TXV, about 6 inches
B. Inlet of the TXV about 6 inches
C. Outlet of the condenser, and on the superheat line
D. Outlet of the evaporator - *answers *D. Outlet of the evaporator
which of the following is TRUE, of a solenoid value in a pump down system?
A. It is located after the metering device
B. It is located before the metering device
C. It is located after the evaporator
D. It is used instead of a metering device - *answers *B. It is located before the
metering device
, HVAC ESCO Basic Test Review
The evaporator temperature on an air conditioning system should be
A. 40 to 50 degrees F
B. No more than 32 degrees F
C. More than 50 degrees F
D. 20 to 30 degrees F - *answers *A. 40 to 50 degrees F
The second best way to charge a capillary tube system is
A. Use the superheat charging table or curve
B. Listen to the sounds the compressor makes
C. Charge the unit and watch for sweating or frost on the suction line
D. Add refrigerant until the evaporator gets cold - *answers *A. Use superheat charging
table or curve
A partially clogged capillary tube can cause
A. Low head pressure
B. A starved condenser
C. A starved evaporator
D. A flooded evaporator - *answers *C. A starved evaporator
The purpose of a liquid pressure amplification (LPA) is to
A. Increase the superheat only
B. Increase the liquid pressure only
C. Help prevent flashing and increase subcooling
D. Increase the liquid pressure and subcooling - *answers *Help prevent flashing and
increase subcooling
the pressure at which the refrigerant changes state, from vapor to a liquid is the
A. Evaporator pressure
B. Superheated pressure
C. back pressure
D. Condensing pressure - *answers *D. Condensing Pressure
The basic components of a refrigerant system are
A. Compressor, discharge line, receiver, metering device, evaporator, and suction line
B. Filter dryer, receiver, and high and low sides
C. Condenser, discharge line, receiver, metering device, and suction line
D. Compressor, metering device, and refrigerant - *answers *A. Compressor,
Discharge line, Receiver, Metering device, evaporator, and Suction Line
A pressure gauge place anywhere from the metering device to the compressor will read
A. The low side or evaporating pressure
B. The head pressure
C. the Total high Pressure
D. The subcooling - *answers *A. The low side or evaporating pressure
A liquid to suction heat exchanger is often used to
A. Decrease Vapor Superheat
B. Increase liquid subcooling
C. Decrease head pressure
D. Increase Flash gas in the suction line - *answers *B. Increase liquid subcooling
The term, refrigerant conditions refer to which of the following
A. Saturated ,superheat, or subcooling refrigerant
B. Pressurized refrigerant only
C. A system in a complete vacuum
D. the outdoor ambient air temperature - *answers *A. Saturated, superheat, or
subcooling
The component in the refrigeration system used to catch and prevent liquid from
entering the compressor is called the
A. Liquid receiver
B. The accumulator
C. The oil separator
D. The filter dryer - *answers *B. The Accumulator
An air conditioning system or heat pump must have
A. 550-600 cubic feet of air per minute across the evaporator coil
B. 500-550 cubic feet of air per minute across the evaporator coil
C. 400-450 cubic feet of air per minute across the evaporator coil
D. Less than 400 cubic feet of air per minute across the evaporator coil - *answers *C.
400-450 cubic feet of air per minute across the evaporator coil
The refrigerant charge in a TXV remote bulb or power element must
A. Be changed when the filter dryer is changed
B. Have similar characteristics to the refrigerant in the system
C. Be discharged before it is effective
D. Have pressure similar to R-134A - *answers *B. Have similar characteristics to the
refrigerant in the system
The remote bulb of a TXV should be fastened to the
A. Outlet of the TXV, about 6 inches
B. Inlet of the TXV about 6 inches
C. Outlet of the condenser, and on the superheat line
D. Outlet of the evaporator - *answers *D. Outlet of the evaporator
which of the following is TRUE, of a solenoid value in a pump down system?
A. It is located after the metering device
B. It is located before the metering device
C. It is located after the evaporator
D. It is used instead of a metering device - *answers *B. It is located before the
metering device
, HVAC ESCO Basic Test Review
The evaporator temperature on an air conditioning system should be
A. 40 to 50 degrees F
B. No more than 32 degrees F
C. More than 50 degrees F
D. 20 to 30 degrees F - *answers *A. 40 to 50 degrees F
The second best way to charge a capillary tube system is
A. Use the superheat charging table or curve
B. Listen to the sounds the compressor makes
C. Charge the unit and watch for sweating or frost on the suction line
D. Add refrigerant until the evaporator gets cold - *answers *A. Use superheat charging
table or curve
A partially clogged capillary tube can cause
A. Low head pressure
B. A starved condenser
C. A starved evaporator
D. A flooded evaporator - *answers *C. A starved evaporator
The purpose of a liquid pressure amplification (LPA) is to
A. Increase the superheat only
B. Increase the liquid pressure only
C. Help prevent flashing and increase subcooling
D. Increase the liquid pressure and subcooling - *answers *Help prevent flashing and
increase subcooling
the pressure at which the refrigerant changes state, from vapor to a liquid is the
A. Evaporator pressure
B. Superheated pressure
C. back pressure
D. Condensing pressure - *answers *D. Condensing Pressure
The basic components of a refrigerant system are
A. Compressor, discharge line, receiver, metering device, evaporator, and suction line
B. Filter dryer, receiver, and high and low sides
C. Condenser, discharge line, receiver, metering device, and suction line
D. Compressor, metering device, and refrigerant - *answers *A. Compressor,
Discharge line, Receiver, Metering device, evaporator, and Suction Line
A pressure gauge place anywhere from the metering device to the compressor will read
A. The low side or evaporating pressure
B. The head pressure
C. the Total high Pressure
D. The subcooling - *answers *A. The low side or evaporating pressure
