ELECTRIC CONTROL SYSTEM
EXPECTED QUESTIONS WITH VERIFIED ANSWERS
Question 1.
above-atmospheric pressure element
ANSWER
a type of control device that closes an electrical circuit on temperature rise.
Question 2.
actuator
ANSWER
a device that operates based on the signal from the controller. solenoids, contactors, and
relays are examples of actuators that perform functions such as opening and closing valves or
turning motors on and off.
Question 3.
anticipator
ANSWER
a device that assists the controller by causing the sensor to detect the cut-in or cut-out
temperature slightly before the conditioned area actually reaches that temperature. often this
is a resistor used in a thermostat.
Question 4.
below-atmospheric pressure element
ANSWER
a type of control device that opens an electrical circuit on temperature rise
, Question 5.
bimetal coil
ANSWER
a thermostatic control made of a coil of two different metals that expands and contracts with
changes in temperature, causing a mercury switch mounted on one end to tilt and open or
close a circuit
Question 6.
bimetal device
ANSWER
a device made of two different metal bonded together and formed into a particular shape.
which makes the device bend in the desired direction.
Question 7.
bimetal disc
ANSWER
a thermostatic control that consists of a concave disc composed of two different metals. the
disc is dished in one direction when it is cooled and snaps into a dished position in the
opposite direction as it warms.
Question 8.
bimetal strip
ANSWER
a thermostatic control with electrical contacts at either end. as the strip reacts to different heat
condition, it opens and closes the contact points of an electrical circuit
Question 9.
blown fuse
ANSWER
an electrical fuse in which the conductive element inside the fuse has melted to open the
circuit and prevent excess current flow.
EXPECTED QUESTIONS WITH VERIFIED ANSWERS
Question 1.
above-atmospheric pressure element
ANSWER
a type of control device that closes an electrical circuit on temperature rise.
Question 2.
actuator
ANSWER
a device that operates based on the signal from the controller. solenoids, contactors, and
relays are examples of actuators that perform functions such as opening and closing valves or
turning motors on and off.
Question 3.
anticipator
ANSWER
a device that assists the controller by causing the sensor to detect the cut-in or cut-out
temperature slightly before the conditioned area actually reaches that temperature. often this
is a resistor used in a thermostat.
Question 4.
below-atmospheric pressure element
ANSWER
a type of control device that opens an electrical circuit on temperature rise
, Question 5.
bimetal coil
ANSWER
a thermostatic control made of a coil of two different metals that expands and contracts with
changes in temperature, causing a mercury switch mounted on one end to tilt and open or
close a circuit
Question 6.
bimetal device
ANSWER
a device made of two different metal bonded together and formed into a particular shape.
which makes the device bend in the desired direction.
Question 7.
bimetal disc
ANSWER
a thermostatic control that consists of a concave disc composed of two different metals. the
disc is dished in one direction when it is cooled and snaps into a dished position in the
opposite direction as it warms.
Question 8.
bimetal strip
ANSWER
a thermostatic control with electrical contacts at either end. as the strip reacts to different heat
condition, it opens and closes the contact points of an electrical circuit
Question 9.
blown fuse
ANSWER
an electrical fuse in which the conductive element inside the fuse has melted to open the
circuit and prevent excess current flow.
