Questions – Answers
Electrical and Electronics Engineering Interview Questions and Answers
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Why are Inductive & Capacitive Reactances Measured in Ohms?
Why are both Inductive and Capacitive Reactances Measured in Ohms instead of Farad, Henry or kVAR? In a DC circuit, there is no concept of inductive or capacitive reactance because…
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What Happens If You Install a Larger Capacitor in a Fan?
Disadvantages of Using Higher Capacitance with AC Fans The primary function of a capacitor in a ceiling fan is to provide the necessary phase shift for starting torque and to…
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Difference Between Grounding, Grounded and Ungrounded Conductors
Difference Between Grounding (Ground), Grounded (Neutral) and Ungrounded (Phase/Hot/Line) Conductors Grounding and grounding conductors are related terms commonly used in the National Electrical Code (NEC), technical guides, and user manuals.…
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Difference Between AFCI, CAFCI, DFCI and GFCI?
What is the Difference Between AFCI, CAFCI, DFCI and GFCI AFCI (Arc-Fault Circuit Interrupter), CAFCI (Combination Arc-Fault Circuit Interrupter), and DFCI (Dual-Function Circuit Interrupter) are protective devices and circuit breakers…
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Why is a Capacitor Bank Rated in kVAR, Not in Farad?
Why is the Rating of a Capacitor Bank Expressed in kVAR Instead of Watt or Farad We know that a capacitor is rated in Farads because its capacitance value indicates…
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Why is the Rating of a Capacitor Expressed in Farad?
Why is a Capacitor Rated in Farads rather than W, VA or Ah A capacitor stores electrical energy in the form of an electric field between its plates. The value…
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What Happens When You Press TEST and RESET on a GFCI
What Do the TEST and RESET Buttons Mean on GFCI Breakers and Outlets? Why Do Some Breakers in My Panel Have a TEST/RESET Buttons? Not all breakers look the same…
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Why are the Breakers Switched Opposite to Light Switches?
Why Does the Circuit Breaker Turn ON in the Opposite Direction Compared to General Wall Light Switches? In residential 120/240V electrical panels following NEC/UL standards (common in North America), the…
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What Would Happen If You Plugged A Charger into Another?
What Happens if You Plug Two USB Chargers into Each Other? Although it is not recommended, it is technically possible to connect two USB chargers (whether Type-A or Type-C) to…
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Should GFCI Protection Be in the Main Panel or Receptacle?
Is It Better to Install GFCI Protection in the Electrical Panel or at the Outlet? Ground Fault Circuit Interrupters (GFCIs) are designed to detect ground faults and protect against electric…
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