EMC Chapter 6

Question 1

___ are the most common control switches used on industrial equipment.

Answer 1

Pushbuttons

Question 2

A(n)___ is the part of a switch that includes the written description of the switch’s operation.

Answer 2

legend plate

Question 3

A(n)___ is the device that is pressed, pulled, or rotated by the individual operating the circuit.

Answer 3

operator

Question 4

A(n)___ button operator can be operated from any angle and is used in applications that require fast operation such as emergency stops, motor stops, and valve shutoffs.

Answer 4

Jumbo mushroom

Question 5

A selector switch is a switch with an operator that is ___ to activate the electrical contacts.

Answer 5

rotated

Question 6

A ___ table is made and positioned near the switch to illustrate each position and each contact.

Answer 6

truth

Question 7

A(n)___ is placed in a truth table is a contact is closed in any position.

Answer 7

X

Question 8

A ___ is an operator that selects one to eight different circuit conditions when it is shifted from its center position.

Answer 8

joystick

Question 9

The most common application of a joystick is in controlling a ___.

Answer 9

hoist

Question 10

Line diagrams may use a(n)___ to indicate which joystick position will operate the contacts.

Answer 10

dot

Question 11

A ___ switch is a mechanical input that requires physical contact of the object with the switch actuator.

Answer 11

limit

Question 12

A ___ is not a basic actuator used on limit switches.

Answer 12

contact pole

Question 13

A fork lever actuator is an actuator operated by on of ___ roller arms.

Answer 13

two

Question 14

A ___ actuator is an actuator operated by direct forward movement into the limit switch.

Answer 14

push-roller

Question 15

A ___ is not a common foot switch application.

Answer 15

two-hand safety circuit

Question 16

Most foot switches have ___ positions.

Answer 16

two

Question 17

In a foot switch, the ___ position is normally spring-loaded so that the switch automatically returns to the position when released.

Answer 17

OFF

Question 18

One psi equals ___ in. WC.

Answer 18

27.68

Question 19

A ___ is not a common sensing device used by most pressure switches.

Answer 19

barometer

Question 20

___ sensing devices are used for high-pressure applications.

Answer 20

Piston

Question 21

___ is the amount of pressure that must be removed before the switch contacts reset for another cycle after the set point has been reached and the switch has been actuated.

Answer 21

Deadband

Question 22

___ switches are control devices that react to heat intensity.

Answer 22

Temperature

Question 23

A(n)___ system is not a common application of temperature switches.

Answer 23

air compression

Question 24

In a cooling system, as the ambient temperature ___, the switch contacts close and turn on a cooling device.

Answer 24

rises

Question 25

___ is the travel of fluid in response to a force caused by pressure or gravity.

Answer 25

Flow

Question 26

A ___ switch is a control switch that detects the movement of a fluid

Answer 26

flow

Question 27

Applications that use flow switches to detect the presence or absence of flow include ___ systems.

Answer 27

hoist

Question 28

A ___ switch is a switch that detects the height of a liquid or solid inside a tank.

Answer 28

level

Question 29

___ level switches use a float that moves up and down with the level of the liquid and activates electrical contacts at a set height.

Answer 29

Mechanical

Question 30

A(n)___ probe level switch is a level switch that uses liquid to complete the electrical path between two conductive probes.

Answer 30

conductive

Question 31

A ___ level switch detects the dielectric variation when a product is in contact with the probe and when the product is not in contact with the probe.

Answer 31

capacitive

Question 32

___ loads are the least destructive loads to switch

Answer 32

Resistive

Question 33

A pressure switch is rated according to its ___ pressure range.

Answer 33

operating

Question 34

Most ___ switches use a paddle to detect the movement of a product.

Answer 34

flow