EBK ACTIVITIES MANUAL FOR PROGRAMMABLE
EBK ACTIVITIES MANUAL FOR PROGRAMMABLE
5th Edition
ISBN: 8220102795983
Author: Petruzella
Publisher: YUZU
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Chapter 6, Problem 10RQ
Program Plan Intro

Switch:

  • A switch refers to an electrical device which can make or break an electrical circuit.
  • Switches can be operated manually or by some sensing element such as pressure, temperature, or flow.
  • A switch consists of one or more sets of contacts that can be operated simultaneously, sequentially, or alternately.

Explanation of Solution

b.

NC pushbutton switch:

  • The abbreviation NC stands for a Normally Closed pushbutton switch.
  • It will be initially at closed contact and will be opened when the switch or coil is energized...

Explanation of Solution

c.

Break-make pushbutton switch:

  • Break-before-make pushbutton is a switch whose top level section contacts are Normally Closed and bottom level section contacts are Normally Open.
  • The top level contacts will open before the botto...

Explanation of Solution

d.

Three-position selector switch:

  • In order to open and close the contacts of an attached contact block, a selector switch operator is rotated.
  • The operator knob is turned to right or left to establish a switch position.
  • Selector switch consists of two or more selector positions...

Explanation of Solution

e.

NO limit switch:

  • Normally Open limit switch refers to a commonly used industrial control device.
  • It is used to operate when a predetermined limit is reached.
  • It is started by the contact with an object such as a cam...

Explanation of Solution

f.

NC temperature switch:

  • NC temperature switch refers to a switch which is activated at specific temperature.
  • Applications of temperature switches include maintaining the desired temperature range of solids, liquids, gases, or air...

Explanation of Solution

g.

NO pressure switch:

  • NO pressure switch refers to a switch which is activated at specific pressure.
  • It is used to control the pressure of gases and liquids...

Explanation of Solution

h.

NC level switch:

  • NC level switch is designed to sense liquid level in vessel.
  • It provides automatic control for motors which transfers liquids from sumps into tanks...

Explanation of Solution

i:

NO proximity switch:

  • NC proximity switch does not need any physical contact to sense the presence or absence of a target.
  • Here, any object such as vibrations, liquids, or chemicals near to the proximity switch range will respond and act as ON-OFF switch...

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