Questions – Answers

Electrical and Electronics Engineering Interview Questions and Answers

What happens to the 3-Phase Motor When 1 Out of 3 Phases is Lost?

What will happen to the 3-Φ Induction Motor Incase of Failure of 1 of the 3-Phases? A three phase induction motor must be connected to all the three phases for…
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Why are US Homes Wired Using Solid Wire rather than Stranded Wire?

Why Do the Electricians in the U.S.A opt-out for Solid Wire Instead of Stranded Wire While Doing Home Wiring? In most countries across the EU, UK, South America, Africa, and…
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Stranded Wire vs. Solid Wire: Which One is Better and Why?

Which One Carries More Current – Solid Conductor or Stranded Conductor? The war is still on and there is no winner yet between solid wire and stranded wire. One can…
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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 Do the Different Colors of Electrical Outlets Indicate?

What Are the Different Colored Outlets and Receptacles (i.e. Red, Blue, and Orange) Used For? In commercial as well as hospitals, you may have noticed different colored electrical receptacles such…
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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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