NATE: Electrical Controls exam with correct answers 2024
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Course
NATE: Electrical Controls
Institution
NATE: Electrical Controls
A fuse is used in an electrical circuit to correct answers Protect the circuit wires from an overcurrent condition
How are fuses rated correct answers In amps with a maximum voltage rating
What will an ohmmeter measure when testing an open fuse correct answers Infinite resistance
What t...
A fuse is used in an electrical circuit to correct answers Protect the circuit
wires from an
overcurrent
condition
How are fuses rated correct answers In amps with a maximum
voltage rating
What will an ohmmeter measure when testing an open fuse correct
answers Infinite
resistanc
e
What type of sensing element is commonly found in fan and limit
controls correct
answers
Bimetal
What is used to sense space temperature in electronic temperature
controls correct
answers
Thermistors
What is known about a liquid-charged remote-type temperature control
correct
Its bulb answers
is both extremely sensitive and completely full
of liquid
When installing the gas-charged remote temperature control correct
answersbulb
sensing Its must always be the coldest part of the
control
A temperature control that uses a positive temperature coefficient
thermistor
correct (PTCT)Increases resistance as temperature
answers
increases
A heating thermostat correct answers Opens on a rise in
temperature
The heat anticipator correct answers Controls system
overshoot
When adjusting a heat anticipator on a thermostat correct answers The
heating control
amperage must be
measured
The correct color code and its circuit for a heating and cooling
thermostat
answers Red-power
correct source, Yellow-cooling circuit, White-heating circuit,
Green-fan
rela
y
How many wires does a two-stage heating and two-stage cooling thermostat
commonly
use correct
answers 6
What is the purpose of automatic changeover on a heating and cooling
thermostat
correct answers It automatically changes from heating
to cooling
, What is the definition of a deadband correct answers Deadband is the
point
the at which is satisfied when in the
thermostat
automatic cycle
An outdoor thermostat that is used on an electric heating system is
commonly
correct used to
answers Energize electric heaters if the outdoor temperature
drops below a
predetermined
temperature
A cooling thermostat correct answers Opens on a drop in
temperature
A cooling anticipator correct answers Controls
system lag
Outdoor thermostats are used on A/C systems to correct answers De-
energize theduring low ambient
compressor
conditions
What type of sensing element is the most accurate correct answers A
thermistor
What is known about the anticipators that are located on a programmable
thermostat
correct answers The heating either has a fixed setting, or adjustable; cooling
has a fixed
settin
g
On a heat pump type programmable thermostat what cycle uses an LED
light correct
answers The emergency heat
cycle
When installing a programmable thermostat, what extra low-voltage wire is
commonly
added to the circuit correct answers The common from the
transformer
How does a two-stage therostat control a heat pump during the heating
cycle
answers correct
The compressor is controlled by the first stage, and the auxilliary
hreaters are
controlled by the second
stage
What is a battery used for on a programmable thermostat correct answers
To save the
system's program if there is a loss of
power
In a programmable thermostat what is "temperature setback" correct
answers It is the
temperature setting of the thermostat during an
unoccupied time
What is meant by the term "intelligent recovery" correct answers It is the
gradual
of spacereturn
temperature to the system's set point after a
system setback
What is the purpose of the limit control on a heating system correct
answers Itthe
energizes de- gas valve if the temperature of the heat exchanger
becomes excessive
The limit switch that is used on a forced-air gas-fired furnace is
commonly
answers correctbimetal
A closed
switch
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