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...