HPSV FINAL EXAMS ANSWERS AND QUESTIONS SET
A+
✔✔Suction line low pressure controls are often used in heat pumps to protect the
compressor: - ✔✔D. If suction pressure drops too low and to detect a loss of charge
✔✔On a service call for a cooling problem with the heat pump the inspection finds a
liquid line that has condensation on it. What is the most likely cause? - ✔✔B. Liquid line
is restricted
✔✔The minimum circuit ampacity (MCA) listed on the data plate of a package to heat
pump is used to determine: - ✔✔C. The maximum fuse or a circuit breaker size
✔✔In a low-voltage circuit, a corroded wire to terminal connection ask in the circuit like
a: - ✔✔C. Additional resistor
✔✔In heating mode, a manifold gauge set is connected to the vapor and liquid line
service valves of a properly charge system. What would the expected pressure be? -
✔✔D. Vapor line will be higher and liquid line will be lower
✔✔Which of the following are temperatures used by electronica demand defrost
controls? - ✔✔A. Outdoor coil and outdoor air
✔✔What could cause a customer to complain that their single zoned home system in
cooling mode feels sticky or damp? - ✔✔C. Returns pulling in unconditioned air
✔✔An electronica room thermostat without remote sensors may have a feature that
allows: - ✔✔B. Controlling of multiple zones
✔✔What is the thermal balance point of a dual fuel heat pump? - ✔✔C. The outdoor
conditions at which the capacity of auxiliary heat alone matches the heating load
, ✔✔What is the relationship between inrush current and holding current of a relay coil? -
✔✔C. In rush current is always better than holding current
✔✔What measurements are needed to determine low side superheat? - ✔✔D. Suction
pressure and suction line temperature
✔✔Using a voltmeter, how does a technician determine voltage drop on the outdoor unit
of a heat pump? - ✔✔D. With the outdoor unit not operating and then with the outdoor
unit operating
✔✔A line voltage fuse is sized to: - ✔✔D. Protect from excessive voltage
✔✔What is the effect of 170 V supplied to way 208/230 V compressor? - ✔✔C. Current
increases and the motor may trip on overload
✔✔The technician suspects that an outdoor thermostat used to bring on auxiliary he
may be out of calibration. The thermostat is a close on fall type that is adjustable. One
method for checking the thermostats calibration is to: - ✔✔A. Manually rotate the shaft
until the thermostat closes and compare the dial setting to an accurate outdoor
temperature reading +10°F
✔✔what is a primary consideration when bending soft copper tubing into a bed of any
radius? - ✔✔C. The cross-sectional area of the tube must not be significantly reduced
✔✔A technician checks a package heat pump operating in cooling and find the following
conditions:
The unit has a piston type metering device on both the indoor and outdoor coils, outdoor
temperature 75°F, superheat 55°F
what is the diagnosis and corrective action? - ✔✔A. The unit is low on charge and
charge needs to be added
✔✔What is one consideration when securing a refrigerant line set to reduce indoor
operating sound? - ✔✔D. Isolating refrigerant lines from direct contact with structure
✔✔What describes the airflow path of an outdoor pull through coil? - ✔✔A. Air moves
from the outside to the inside of the coil
✔✔Heat pumps are typically sized for the conditions space based on the: - ✔✔C.
Cooling load
✔✔What type of blower is most commonly used in an indoor residential unit? - ✔✔B.
Forward curved centrifugal fan
A+
✔✔Suction line low pressure controls are often used in heat pumps to protect the
compressor: - ✔✔D. If suction pressure drops too low and to detect a loss of charge
✔✔On a service call for a cooling problem with the heat pump the inspection finds a
liquid line that has condensation on it. What is the most likely cause? - ✔✔B. Liquid line
is restricted
✔✔The minimum circuit ampacity (MCA) listed on the data plate of a package to heat
pump is used to determine: - ✔✔C. The maximum fuse or a circuit breaker size
✔✔In a low-voltage circuit, a corroded wire to terminal connection ask in the circuit like
a: - ✔✔C. Additional resistor
✔✔In heating mode, a manifold gauge set is connected to the vapor and liquid line
service valves of a properly charge system. What would the expected pressure be? -
✔✔D. Vapor line will be higher and liquid line will be lower
✔✔Which of the following are temperatures used by electronica demand defrost
controls? - ✔✔A. Outdoor coil and outdoor air
✔✔What could cause a customer to complain that their single zoned home system in
cooling mode feels sticky or damp? - ✔✔C. Returns pulling in unconditioned air
✔✔An electronica room thermostat without remote sensors may have a feature that
allows: - ✔✔B. Controlling of multiple zones
✔✔What is the thermal balance point of a dual fuel heat pump? - ✔✔C. The outdoor
conditions at which the capacity of auxiliary heat alone matches the heating load
, ✔✔What is the relationship between inrush current and holding current of a relay coil? -
✔✔C. In rush current is always better than holding current
✔✔What measurements are needed to determine low side superheat? - ✔✔D. Suction
pressure and suction line temperature
✔✔Using a voltmeter, how does a technician determine voltage drop on the outdoor unit
of a heat pump? - ✔✔D. With the outdoor unit not operating and then with the outdoor
unit operating
✔✔A line voltage fuse is sized to: - ✔✔D. Protect from excessive voltage
✔✔What is the effect of 170 V supplied to way 208/230 V compressor? - ✔✔C. Current
increases and the motor may trip on overload
✔✔The technician suspects that an outdoor thermostat used to bring on auxiliary he
may be out of calibration. The thermostat is a close on fall type that is adjustable. One
method for checking the thermostats calibration is to: - ✔✔A. Manually rotate the shaft
until the thermostat closes and compare the dial setting to an accurate outdoor
temperature reading +10°F
✔✔what is a primary consideration when bending soft copper tubing into a bed of any
radius? - ✔✔C. The cross-sectional area of the tube must not be significantly reduced
✔✔A technician checks a package heat pump operating in cooling and find the following
conditions:
The unit has a piston type metering device on both the indoor and outdoor coils, outdoor
temperature 75°F, superheat 55°F
what is the diagnosis and corrective action? - ✔✔A. The unit is low on charge and
charge needs to be added
✔✔What is one consideration when securing a refrigerant line set to reduce indoor
operating sound? - ✔✔D. Isolating refrigerant lines from direct contact with structure
✔✔What describes the airflow path of an outdoor pull through coil? - ✔✔A. Air moves
from the outside to the inside of the coil
✔✔Heat pumps are typically sized for the conditions space based on the: - ✔✔C.
Cooling load
✔✔What type of blower is most commonly used in an indoor residential unit? - ✔✔B.
Forward curved centrifugal fan
