Questions – Answers
Electrical and Electronics Engineering Interview Questions and Answers
-
Why Do We Need a GFCI & How Does it Protect During Faults?
Why Do We Need a GFCI Breaker and How Does it Protect During Ground Faults? A Ground Fault Circuit Interrupter (GFCI) is designed to protect circuits by detecting electrical faults…
Read More » -
How Does a Standard Breaker Respond to Electrical Fault?
How Does an Ordinary Circuit Breaker Operates During Short Circuit, Overload & Ground Faults? When a standard circuit breaker detects a fault, such as an overload or short circuit, it…
Read More » -
Why Doesn’t a Standard Breaker Protract Against Ground Faults?
Why Does a Standard Breaker Pose a Shock Hazard with a Broken Neutral? A broken neutral in a circuit with a standard breaker can pose a shock hazard because the…
Read More » -
How Do GFCI and Standard Breakers Respond to Ground Faults?
How Does a GFCI Breaker Protect Us in Case of a Fault, Compared to Standard Breakers? An ordinary circuit breaker in the main panel for household appliances protects only in…
Read More » -
What Happens if the Neutral is Lost in the Main or Subpanel?
What Will Happen When the Neutral is Broken in the Main Panel or Subpanel? The neutral wire provides a return path for current back to the power source, completing the…
Read More » -
Why Must Neutral and Ground Wires Be Bonded in the Main Panel?
Why Do Neutral and Ground Conductors Need to Be Bonded in the Main Panel? According to NEC Article 250, both the neutral and ground wires must be connected only in…
Read More » -
Why are Neutral and Ground Wires Separated in a Subpanel?
Why Do Neutral and Ground Conductors Need to Be Separated in a Subpanel? According to NEC Article 250, neutral and ground wires must remain separate in subpanels. Bonding (connecting) the…
Read More » -
Why are Electrical Busbars Rectangular Instead of Circular?
Why is the Preferred Shape of Busbars Rectangular or Flat Rather than Circular or Round Shaped Cables? What is an Electrical Busbar? An electrical busbar is a metallic strip or…
Read More » -
What Happens When You Touch an Electrical Busbar?
What Happens When a Person Comes into Contact with a Live Busbar? Busbars in main panels and distribution boards are often fed by high voltage and current, for example, 7.2kV…
Read More » -
How Does the Grounding System Work in Aircraft & Submarines?
How is Grounding in AC/DC Systems Used for Protection in Aircraft, Ships, and Submarines? Aircraft, ships, and submarines represent significant investments and require advanced levels of electrical protection. These vehicles,…
Read More »
