HVAC STAR LATEST EXAM 2026
WITH ORGANIZED QUESTIONS
FULLY SOLVED EXPERT VERIFIED
STEP BY STEP EXPLANATIONS AND
REVIEW GUIDE ALREADY GRADED
A+ AND 100% PASS GUARANTEE
(BRAND NEW EDITION!!!!)
The refrigerant line that connects the condenser to the metering
device is ___________ line. - THE CORRECT ANSWER-liquid
In a three-phase system, the voltage imbalance between any
two legs may not vary by more than: - THE CORRECT ANSWER-2%
A lamp source has a voltage of 110 volts and a current of 0.9
amperes. What is the resistance of the lamp? - THE CORRECT
ANSWER-122.2ohms
Lithium-Bromide is used in absorption systems as: - THE CORRECT
ANSWER-a salt solution
an absorbent (attractant)
a solution that creates a pressure difference
(((all of the above))))
,The amount of heat removed to lower the temperature of 15 lbs
of water from 48 degrees F to 39 degrees F is: - THE CORRECT
ANSWER-135 Btu.
Heat flows downhill. This means: - THE CORRECT ANSWER-it
naturally flows from warmer to colder substance.
When water is introduced into the end of a chiller it is
contained in: - THE CORRECT ANSWER-water boxes
Atmospheric pressure at sea level is: - THE CORRECT ANSWER-14.7 psi
Refrigerant leaves the compressor through the ___________
line. - THE CORRECT ANSWER-discharge line
What is the maximum allowable current imbalance rating in a
three-phase supply? - THE CORRECT ANSWER-10%
A dual-element fuse has: - THE CORRECT ANSWER-a thermal cutout
and a normal fuse link
Electricity results from the movement of tiny negatively
charged particles called - THE CORRECT ANSWER-electrons
A hermetic motor should never be energized or tested with a
megger when in a deep vacuum because - THE CORRECT ANSWER-the
,dielectric strength of the motor's insulation would be greatly
reduced.
Lock-out relays are used in air conditioning systems to: - THE
CORRECT ANSWER-prevent compressor short-cycling
With a change in temperature, a thermistor will change - THE
CORRECT ANSWER-resistance
The average house line pressure for Natural Gas is - THE CORRECT
ANSWER-7" W.C.
A bellows is used: - THE CORRECT ANSWER-in both pressure and
temperature controllers
In the hot-gas bypass control method, the system component
which is bypassed is: - THE CORRECT ANSWER-the condenser.
One type of pressure sensing device uses a flattened metal tube,
which is bent into a part circle with one end fixed in place and
connected to a system to be measured. The other end of the
tube is closed and free to move. An increase in pressure tends to
straighten the tube. The movement of the free end of the tube is
connected to a dial that reads pressure. This type of gage is
called a - THE CORRECT ANSWER-bourdon tube
For maximum safety of equipment, overload relays should be: -
THE CORRECT ANSWER-manual reset type
, In a CSR motor with 10 microfarad run capacitor and a 110
microfarad start capacitor, the total capacitance will be
___________. - THE CORRECT ANSWER-120 microfarads.
What is the maximum safe amperage draw of the secondary
winding of a 60 VA transformer output of 12 volts? - THE CORRECT
ANSWER-5 amps.
Fuses in motor branch-circuits primarily provide: - THE CORRECT
ANSWER-motor short-circuit protection
The heating capacity of an air-to-air heat pump: - THE CORRECT
ANSWER-decreases as outdoor air gets colder
Capacity control on a helical-rotary (screw) compressor is
obtained using - THE CORRECT ANSWER-a sliding valve.
Outdoor reset of hot water temperature for heating gives: - THE
CORRECT ANSWER-hottest water during the coldest weather
Closed transition starting means: - THE CORRECT ANSWER-the motor
is never disconnected from the line during starting
In order to protect a load, safety limit devices are most often
wired - THE CORRECT ANSWER-in series
Suction line filter-driers are usually equipped with gage
connections so that pressure drops can be determined. Why? -
WITH ORGANIZED QUESTIONS
FULLY SOLVED EXPERT VERIFIED
STEP BY STEP EXPLANATIONS AND
REVIEW GUIDE ALREADY GRADED
A+ AND 100% PASS GUARANTEE
(BRAND NEW EDITION!!!!)
The refrigerant line that connects the condenser to the metering
device is ___________ line. - THE CORRECT ANSWER-liquid
In a three-phase system, the voltage imbalance between any
two legs may not vary by more than: - THE CORRECT ANSWER-2%
A lamp source has a voltage of 110 volts and a current of 0.9
amperes. What is the resistance of the lamp? - THE CORRECT
ANSWER-122.2ohms
Lithium-Bromide is used in absorption systems as: - THE CORRECT
ANSWER-a salt solution
an absorbent (attractant)
a solution that creates a pressure difference
(((all of the above))))
,The amount of heat removed to lower the temperature of 15 lbs
of water from 48 degrees F to 39 degrees F is: - THE CORRECT
ANSWER-135 Btu.
Heat flows downhill. This means: - THE CORRECT ANSWER-it
naturally flows from warmer to colder substance.
When water is introduced into the end of a chiller it is
contained in: - THE CORRECT ANSWER-water boxes
Atmospheric pressure at sea level is: - THE CORRECT ANSWER-14.7 psi
Refrigerant leaves the compressor through the ___________
line. - THE CORRECT ANSWER-discharge line
What is the maximum allowable current imbalance rating in a
three-phase supply? - THE CORRECT ANSWER-10%
A dual-element fuse has: - THE CORRECT ANSWER-a thermal cutout
and a normal fuse link
Electricity results from the movement of tiny negatively
charged particles called - THE CORRECT ANSWER-electrons
A hermetic motor should never be energized or tested with a
megger when in a deep vacuum because - THE CORRECT ANSWER-the
,dielectric strength of the motor's insulation would be greatly
reduced.
Lock-out relays are used in air conditioning systems to: - THE
CORRECT ANSWER-prevent compressor short-cycling
With a change in temperature, a thermistor will change - THE
CORRECT ANSWER-resistance
The average house line pressure for Natural Gas is - THE CORRECT
ANSWER-7" W.C.
A bellows is used: - THE CORRECT ANSWER-in both pressure and
temperature controllers
In the hot-gas bypass control method, the system component
which is bypassed is: - THE CORRECT ANSWER-the condenser.
One type of pressure sensing device uses a flattened metal tube,
which is bent into a part circle with one end fixed in place and
connected to a system to be measured. The other end of the
tube is closed and free to move. An increase in pressure tends to
straighten the tube. The movement of the free end of the tube is
connected to a dial that reads pressure. This type of gage is
called a - THE CORRECT ANSWER-bourdon tube
For maximum safety of equipment, overload relays should be: -
THE CORRECT ANSWER-manual reset type
, In a CSR motor with 10 microfarad run capacitor and a 110
microfarad start capacitor, the total capacitance will be
___________. - THE CORRECT ANSWER-120 microfarads.
What is the maximum safe amperage draw of the secondary
winding of a 60 VA transformer output of 12 volts? - THE CORRECT
ANSWER-5 amps.
Fuses in motor branch-circuits primarily provide: - THE CORRECT
ANSWER-motor short-circuit protection
The heating capacity of an air-to-air heat pump: - THE CORRECT
ANSWER-decreases as outdoor air gets colder
Capacity control on a helical-rotary (screw) compressor is
obtained using - THE CORRECT ANSWER-a sliding valve.
Outdoor reset of hot water temperature for heating gives: - THE
CORRECT ANSWER-hottest water during the coldest weather
Closed transition starting means: - THE CORRECT ANSWER-the motor
is never disconnected from the line during starting
In order to protect a load, safety limit devices are most often
wired - THE CORRECT ANSWER-in series
Suction line filter-driers are usually equipped with gage
connections so that pressure drops can be determined. Why? -
