NATE AIR CONDITIONING AND HEAT PUMP 2025/2026
QUESTIONS WITH ANSWERS GRADED A+
✔✔A technician is working on a heat pump with a capacitor start-capacitor run
compressor. On initial startup, the compressor hums momentarily and then shuts down
on internal overload... - ✔✔The problem is too great a pressure difference on the
compressor
✔✔A step down transformer has a rating of 40 VA. Its primary voltage is 120V with a
secondary voltage of 24V. This transformer must not be connected to a load above a
maximum current draw of... - ✔✔1.7 amps
✔✔A bright red or orange glow from the resistance element in an duct heater... -
✔✔Indicates that the flow of air is insufficient
✔✔The outdoor fan on a heat pump stops during... - ✔✔Defrost to minimize defrost time
✔✔A capacitor start-capacitor run (CSCR) motor has and open run capacitor so it may
start... - ✔✔But it draws a higher than normal running current
✔✔Bent vanes on a direct drive blower wheel in an air handler can cause... - ✔✔Loss in
airflow, excessive motor wear, and Increased noise
✔✔A split system heat pump is using thermostatic expansion valves. The system
performs properly in heating but in cooling the compressor pumps down... - ✔✔Which
could mean the main power element of the indoor expansion valve has lost its charge
✔✔Conditions that can cause a reduction from design capacity in a heat pump are an...
- ✔✔Undersized vapor line
✔✔A symptom that a technician would expect on a heat pump system in the cooling
mode if the check valve is leaking internally is... - ✔✔Flooding of the indoor coil
✔✔A voltage reading across a closed contact in a 24V control circuit indicates... -
✔✔Pitted or dirty contacts
✔✔The first two checks typically made on an electronic check are... - ✔✔Presence of
proper input signals and proper output signals
✔✔In a low voltage circuit, a corroded wire-to-terminal connection acts in the circuit
like... - ✔✔An additional resistor
, ✔✔The continuity of a fuse should be tested by... - ✔✔Checking resistance with the
power off
✔✔The first check made for most electrical troubleshooting is... - ✔✔Voltage check of
the supply line
✔✔To properly check an energized compressor circuit... - ✔✔The technician should use
a VOM set for volts
✔✔The following conditions exist in a circuit that supplies power to three parallel loads
-One load is resistive
-One load is capacitive
-One load is inductive - ✔✔The total current in the circuit when operating will be the
sum of the currents through each load
✔✔The technician is using an analog multimeter to check a run capacitor. With the
meter set to ohms, the needle swings toward zero and then slowly rises toward infinity...
- ✔✔This tells the technician that the capacitor charges and discharges
✔✔If the technician believes that a hermetic compressor has a permanently open
internal protector... - ✔✔The technician should test the compressor while it is cool
✔✔A control string is defined as two or more switch contacts connected in a circuit, or
set of circuits, to control a load. In order to troubleshoot a load controlled by a control
string... - ✔✔The technician must first check for proper voltage applied across the load
✔✔The technician suspects that an outdoor thermostat used to bring on auxiliary heat
may out of calibration. The thermostat is a CLOSE ON FALL type that is adjustable.
One method for checking the thermostat calibration is to... - ✔✔Manually rotate the
shaft until the thermostat until the thermostat closes and then compare the dial setting
to an accurate outdoor temp. reading plus 10F
✔✔When changing out the evaporator coil the installer mjust be certain to... - ✔✔Plumb
the cabinet so its sides are vertical
✔✔The recommended maximum external static pressure used for heating and cooling
equipment with blowers for 5 ton of cooling or less is... - ✔✔0.1 inWC
✔✔When a balancing check of a newly installed duct system the... - ✔✔Dampers
should be open completely in all rooms
✔✔Operating sound is a consideration in the location of a condensing unit because... -
✔✔Excessive noise could be disruptive to the customer
QUESTIONS WITH ANSWERS GRADED A+
✔✔A technician is working on a heat pump with a capacitor start-capacitor run
compressor. On initial startup, the compressor hums momentarily and then shuts down
on internal overload... - ✔✔The problem is too great a pressure difference on the
compressor
✔✔A step down transformer has a rating of 40 VA. Its primary voltage is 120V with a
secondary voltage of 24V. This transformer must not be connected to a load above a
maximum current draw of... - ✔✔1.7 amps
✔✔A bright red or orange glow from the resistance element in an duct heater... -
✔✔Indicates that the flow of air is insufficient
✔✔The outdoor fan on a heat pump stops during... - ✔✔Defrost to minimize defrost time
✔✔A capacitor start-capacitor run (CSCR) motor has and open run capacitor so it may
start... - ✔✔But it draws a higher than normal running current
✔✔Bent vanes on a direct drive blower wheel in an air handler can cause... - ✔✔Loss in
airflow, excessive motor wear, and Increased noise
✔✔A split system heat pump is using thermostatic expansion valves. The system
performs properly in heating but in cooling the compressor pumps down... - ✔✔Which
could mean the main power element of the indoor expansion valve has lost its charge
✔✔Conditions that can cause a reduction from design capacity in a heat pump are an...
- ✔✔Undersized vapor line
✔✔A symptom that a technician would expect on a heat pump system in the cooling
mode if the check valve is leaking internally is... - ✔✔Flooding of the indoor coil
✔✔A voltage reading across a closed contact in a 24V control circuit indicates... -
✔✔Pitted or dirty contacts
✔✔The first two checks typically made on an electronic check are... - ✔✔Presence of
proper input signals and proper output signals
✔✔In a low voltage circuit, a corroded wire-to-terminal connection acts in the circuit
like... - ✔✔An additional resistor
, ✔✔The continuity of a fuse should be tested by... - ✔✔Checking resistance with the
power off
✔✔The first check made for most electrical troubleshooting is... - ✔✔Voltage check of
the supply line
✔✔To properly check an energized compressor circuit... - ✔✔The technician should use
a VOM set for volts
✔✔The following conditions exist in a circuit that supplies power to three parallel loads
-One load is resistive
-One load is capacitive
-One load is inductive - ✔✔The total current in the circuit when operating will be the
sum of the currents through each load
✔✔The technician is using an analog multimeter to check a run capacitor. With the
meter set to ohms, the needle swings toward zero and then slowly rises toward infinity...
- ✔✔This tells the technician that the capacitor charges and discharges
✔✔If the technician believes that a hermetic compressor has a permanently open
internal protector... - ✔✔The technician should test the compressor while it is cool
✔✔A control string is defined as two or more switch contacts connected in a circuit, or
set of circuits, to control a load. In order to troubleshoot a load controlled by a control
string... - ✔✔The technician must first check for proper voltage applied across the load
✔✔The technician suspects that an outdoor thermostat used to bring on auxiliary heat
may out of calibration. The thermostat is a CLOSE ON FALL type that is adjustable.
One method for checking the thermostat calibration is to... - ✔✔Manually rotate the
shaft until the thermostat until the thermostat closes and then compare the dial setting
to an accurate outdoor temp. reading plus 10F
✔✔When changing out the evaporator coil the installer mjust be certain to... - ✔✔Plumb
the cabinet so its sides are vertical
✔✔The recommended maximum external static pressure used for heating and cooling
equipment with blowers for 5 ton of cooling or less is... - ✔✔0.1 inWC
✔✔When a balancing check of a newly installed duct system the... - ✔✔Dampers
should be open completely in all rooms
✔✔Operating sound is a consideration in the location of a condensing unit because... -
✔✔Excessive noise could be disruptive to the customer
