NATE Core QUESTIONS AND ANSWERS 100% ACCURATE.
Care should be taken before sawing a basement wall that was part of the original construction of
the home because those walls are typically load bearing. - True
What can happen if high concentrations of refrigerant vapor are inhaled? - Nausea, dizziness,
heart irregularities, and unconsciousness.
When should the damper on a bypass humidifier be open? - Winter
What should you use to cut capillary tubing? - A triangular or knife-edge file.
How would you connect a voltmeter to a circuit for taking voltage readings? - Connect the
voltmeter in parallel with the circuit being tested.
True or false?
Since electric motors can have two, four, or more poles, the fewer the number of poles, the faster
the motor turns? - True
True or false?
In a tapped multi-speed motor driving a supply blower, changing the connected tap changes the
CFM even under no blower load. - True
What is an example of a wet bulb thermometer? - A conventional thermometer with a moistened
cloth wick covering its sensor.
How is electrical current measured? - Amperes
According to health and safety regulations, how should the worker climb up or down a ladder? -
Always face the ladder.
What steps should a technician take to be certain the electrical meter can be used? - 1. Insert red
test lead into red common jack.
2. Insert black test lead into black MV jack.
3. Connect test probes across the circuit to be measured.
4. Read millivolt on the 0-50 scale.
According to Ohm's Law, when the voltage to an electric heating element is increased by 10%,
what does the current through the element increase by? - 10% (Current in a circuit is directly
proportional to the applied voltage, and inversely proportional to the circuit resistance)
What type of process is combustion? - Chemical
True or false?
, Hacksaws should never be used to cut copper tubing because saw chips can remain inside the
tubing. - True
What type of thermometer is used in a sling psychrometer? - Liquid filled thermometer
How is a pictorial schematic useful? - For quickly visualizing each component in a unit.
How can you compute relative humidity using a sling psychrometer? - By measuring wet bulb
and dry bulb temperatures.
True or false?
Motors above 5 hp that are used with belt driven fans are typically 240v/460v three phase. - True
As static pressure increases in a system with constant airflow, the blower motor amp draw
___________ with the static. - Increases
A technician works for a service company that is portrayed negatively in a news piece. The
technician is given the opportunity to meet with management to go over the information
presented. After hearing all the available facts, the technician decides the company committed no
wrong and should be supported. What character trait is being shown? - Perseverance
True or false?
Current flows in one direction in a DC circuit. - True
What federal agency has jurisdiction over the shipping and labeling of refrigerants? - DOT
(Department of Transportation)
A continuity check using an ohmmeter shows continuity by a reading of what? - Zero ohms or a
specific resistance.
True or false?
An analog VOM is an electrical meter that displays volts, ohms, or milliammeter on an analog
scale. - True
True or false?
A digital electrical multimeter marked "auto ranging" requires the technician to set the range of
the approximate value when set for volts, amps, or ohms. - False. It will automatically set itself
for the range needed.
What is the proper name for the input side of a transformer? - Primary side
What meter setting should a technician use to determine whether or not a set of contacts are open
in an energized circuit? - Volts
What condition must be met to make an agreement legally binding? - The agreement must be in
writing.
Care should be taken before sawing a basement wall that was part of the original construction of
the home because those walls are typically load bearing. - True
What can happen if high concentrations of refrigerant vapor are inhaled? - Nausea, dizziness,
heart irregularities, and unconsciousness.
When should the damper on a bypass humidifier be open? - Winter
What should you use to cut capillary tubing? - A triangular or knife-edge file.
How would you connect a voltmeter to a circuit for taking voltage readings? - Connect the
voltmeter in parallel with the circuit being tested.
True or false?
Since electric motors can have two, four, or more poles, the fewer the number of poles, the faster
the motor turns? - True
True or false?
In a tapped multi-speed motor driving a supply blower, changing the connected tap changes the
CFM even under no blower load. - True
What is an example of a wet bulb thermometer? - A conventional thermometer with a moistened
cloth wick covering its sensor.
How is electrical current measured? - Amperes
According to health and safety regulations, how should the worker climb up or down a ladder? -
Always face the ladder.
What steps should a technician take to be certain the electrical meter can be used? - 1. Insert red
test lead into red common jack.
2. Insert black test lead into black MV jack.
3. Connect test probes across the circuit to be measured.
4. Read millivolt on the 0-50 scale.
According to Ohm's Law, when the voltage to an electric heating element is increased by 10%,
what does the current through the element increase by? - 10% (Current in a circuit is directly
proportional to the applied voltage, and inversely proportional to the circuit resistance)
What type of process is combustion? - Chemical
True or false?
, Hacksaws should never be used to cut copper tubing because saw chips can remain inside the
tubing. - True
What type of thermometer is used in a sling psychrometer? - Liquid filled thermometer
How is a pictorial schematic useful? - For quickly visualizing each component in a unit.
How can you compute relative humidity using a sling psychrometer? - By measuring wet bulb
and dry bulb temperatures.
True or false?
Motors above 5 hp that are used with belt driven fans are typically 240v/460v three phase. - True
As static pressure increases in a system with constant airflow, the blower motor amp draw
___________ with the static. - Increases
A technician works for a service company that is portrayed negatively in a news piece. The
technician is given the opportunity to meet with management to go over the information
presented. After hearing all the available facts, the technician decides the company committed no
wrong and should be supported. What character trait is being shown? - Perseverance
True or false?
Current flows in one direction in a DC circuit. - True
What federal agency has jurisdiction over the shipping and labeling of refrigerants? - DOT
(Department of Transportation)
A continuity check using an ohmmeter shows continuity by a reading of what? - Zero ohms or a
specific resistance.
True or false?
An analog VOM is an electrical meter that displays volts, ohms, or milliammeter on an analog
scale. - True
True or false?
A digital electrical multimeter marked "auto ranging" requires the technician to set the range of
the approximate value when set for volts, amps, or ohms. - False. It will automatically set itself
for the range needed.
What is the proper name for the input side of a transformer? - Primary side
What meter setting should a technician use to determine whether or not a set of contacts are open
in an energized circuit? - Volts
What condition must be met to make an agreement legally binding? - The agreement must be in
writing.
