## Electrical Control Devices Questions Answers

Herein, we have covered several questions answers related to Pushbutton, Selector Switch, Joystick, Limit Switch, Foot Switch, Pressure Switch, Temperature Switch, and Level Switch in detail. Industrial Pushbuttons Describe the different parts of pushbuttons and their functions. Pushbuttons are the most common control switches used on industrial equipment. An industrial pushbutton …

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## Programmable Logic Controller (PLC) Questions Answers

Herein, we have covered several Programmable Logic Controller (PLC) related topics such as Basic Rules of Line Diagrams, Line Diagrams—Signals, Decisions, and Action, and Logic Functions in detail. Basic Rules of Line Diagrams State the basic rules that determine how and where two or more loads are connected into a control circuit. No …

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## Electrical Instrumentation Questions and Answers

Herein, we have covered several Electrical instruments like Digital multimeter, Analog Multimeter, Clamp Meter, Megohmmeter, Oscilloscope, and Phase Sequence Indicator in detail. Safety Understand the stated rules for proper and safe use of hand and power tools. Tools should be kept in good working condition. Periodic inspection of tools helps …

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## DC INVERTER AC TECHNOLOGY

The DC Inverter AC technology is the most recent advancement of innovation concerning the electromotors of the blowers. An Inverter is utilized to control the speed of the blower motor, in order to ceaselessly manage the temperature. The DC inverter units have a variable frequency drive that involves a flexible …

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## Electrical Symbols and Diagrams Questions Answers

Language of Control Identify the differences between pictorial drawings, wiring diagrams, schematic diagrams, line diagrams, block diagrams, and flow charts. A pictorial drawing is a drawing that shows the length, height, and depth of an object in one view. Pictorial drawings show physical details of an object as seen by …

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## Basic Electrical Questions Answers

Herein, we have covered basic Electrical questions related to Electrical Theory, Electric Circuits, Magnetism, and Power in detail. Electrical Theory State the three fundamental parts of an atom and identify their states of charge. The three fundamental particles contained in atoms are protons, neutrons, and electrons. A proton is a …

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## Concentrated Solar Power (CSP) Technologies

Concentrated solar power (CSP), also known as concentrating solar power, solar thermal power, or solar thermal electricity, uses glass mirrors of different architectures to collect the sun’s thermal energy and convert it into electrical energy. This is achieved via conventional thermodynamic power cycles that are adjusted to the specific needs of …

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## Photovoltaic (PV) Cell: Working & Characteristics

Photovoltaic (PV) cells, or solar cells, are semiconductor devices that convert solar energy directly into DC electric energy. In the 1950s, PV cells were initially used for space applications to power satellites, but in the 1970s, they began also to be used for terrestrial applications. Today, PV cells are used …

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## Electric Motor Failure Causes

Electric motors are highly effective and reliable drivers of machinery and other types of equipment. However, motors fail at times. Electric Motor manufacturers have found that overloading is the number one cause of motor failure. Thirty percent of all motors fail due to overloading. An Electric motor is overloaded anytime …

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## PN Junction Diodes and BJT Transistors: an Introduction

This article provides a brief introduction to PN junction diodes and BJT transistors. Doping Silicon: N-Type and P-Type Semiconductors PN junctions play an important role in semiconductor fabrication for integrated circuits. An undoped silicon with a valence of four has an intrinsic concentration of ${{n}_{i}}=1.1\times {{10}^{16}}\text{ }carriers/{{m}^{3}}$ at room temperature. …

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## Three Phase Power Measurement in Three Phase Circuits

Different methods are utilized in order to measure three-phase power in a three-phase circuit. In this particular article, we are going to discuss the following methods in detail: One Wattmeter Method Two Wattmeters Method Three Wattmeters Method A customer of a three-phase electrical service, three-wire or four-wire, will have a …

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## Single & Three Phase Grounding

The National Electrical Code (NEC) defines “ground” as  “A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth or to some conducting body that serves in place of the earth.” Single-Phase Grounding The grounding of a typical residential, single-phase service is represented in Figure …

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## Grounding Electrical System | Purpose of Grounding Electrical Systems

According to the common practice that was followed years ago, many electrical installations were not grounded. Perhaps the need for adequate grounding was not fully recognized, understood, or considered necessary. Today, electrical grounding is considered important to most, but not all, electrical installations. Yet, the importance of proper electrical grounding …

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## Per Unit Calculation | Per Unit System Examples

The per unit (PU or P.U.) method of calculation is often used as an aid in the analysis of electrical systems that operate at different voltage levels. The determination of per unit values is not the end objective of a study. Rather determined per unit values serve to assist in …

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## Electricity Tariffs Explained | Residential and Industrial Tariff

As is the case with many English words, the word “tariff” has more than one definition. A common definition is a tax imposed on imported goods. The second definition is the rate structure charged by a party for services or goods. This second definition is used by many utilities in …

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