Ohms

 ⚡ Electrical Engineering Interview Q&A Series – Part 1 ⚡

Q1: What is Ohm’s Law?

A: Ohm’s Law states that V = I × R, where V is voltage, I is current, and R is resistance.

Q2: What is the difference between AC and DC?

A: AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction only.

Q3: What is the function of an inductor?

A: An inductor stores energy in a magnetic field when current passes through it.

Q4: Why is 50 Hz or 60 Hz frequency used in power systems?

A: These frequencies are standard for efficient generation, transmission, and utilization of electricity, balancing performance and equipment design.

Q5: What is the role of earthing (grounding)?

A: Earthing provides a safe path for fault current to prevent electric shock and protect equipment.

⚡ Electrical Engineering Interview Q&A – Part 2

Q6: Difference between a fuse and an MCB?

A6: Fuse melts during overload and needs replacement; MCB trips and can be reset.

Q7: What is earthing?

A7: Connecting electrical systems to ground for safety and fault current path.

Q8: Purpose of a capacitor in AC circuits?

A8: Improves power factor, reduces voltage fluctuations, and filters harmonics.

Q9: Difference between isolator and circuit breaker?

A9: Isolator is manual and operates without load; breaker works under load and trips automatically on fault.

Q10: Step-up vs Step-down transformer?

A10: Step-up increases voltage; step-down decreases voltage.