Questions – Answers

Electrical and Electronics Engineering Interview Questions and Answers

Why 3-Phase Power? Why Not 6, 12 or More for Power Transmission?

Why is Only 3-Phase Power Supply System Used Instead of 2-Φ, 4-Φ, 6-Φ, 12-Φ or More Number of Phases for Power Transmission & Distribution? We know that the most common…
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If a 1-Phase Supply is 230V, Why is 3-Phase 400V & Not 690V?

When Single Phase Supply Voltage is 220V, Why is Three Phase 440V and Not 660V? If there are three winding coils on the rotor of an alternator winded 120° degree…
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What are the Different Colors Electrical Outlets Used for?

Why are RED, Blue and Orange Colors Receptacles Used in Hospitals & Commercial Applications? In commercial as well as hospitals, you may have noticed different colored electrical receptacles such as…
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Why are Outlets and Receptacles in Hospitals Upside Down?

Why Are Hospitals Outlets Upside Down as Compared to the Residential Receptacles Most of you guys may have noticed the inverted electrical outlets installed in the hospitals while the same…
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Main Difference Between Clipper and Clamper Circuit

What is the Difference Between Clipper and Clamper Circuit? Clipper and clamper circuits are electronic circuits used for the modification of AC signals. The clipper circuit can clip a portion…
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Difference Between Current Transformer & Potential Transformer

What is the Difference between Current Transformer and Potential or Voltage Transformer? The voltage and current used for electrical power transmission over long distances is very high. Measurement of such…
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How to Find the Number of Lights on a Single Circuit Breaker?

How Many Lights Can You Put on a Single Circuit Breaker? – NEC & IEC Another basic query about the lighting points and fixtures on sub circuits and breakers we…
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How to Find the Number of Outlets on a Single Circuit Breaker?

How Many Outlets Can You Put on a Single Circuit Breaker? – NEC & IEC The most frequently asked and searched question from home owners and DIY dudes is what…
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How to Size a Load Center, Panelboards and Distribution Board?

Sizing Main Panel, Load Center, Panelboards, Distribution Board & Consumer Unit According to NEC and IEC? Planning is the first and most critical priority for all electrical wiring projects. Proper…
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Types of Transistors – BJT, FET, JFET, MOSFET, IGBT & Special Transistors

Different Types of Field Effect, Bipolar Junction, Depletion, Enhancement, Insulated Gate Bipolar and Special Transistors Transistor is the most used component in modern electronics and logic circuits due to their…
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