Dewan Electrical

21/03/2026

👉 Basic Electrical Interview Q&A
1. What is electricity?
Answer: The flow of electrons is called electricity.
2. What is voltage?
Answer: The power to run electrons is called voltage.
Unit: Volt (V)
3. What is current?
Answer: The flow of electron is called current.
Unit: Ampere (A)
4. What is resistance?
Answer: Protest against current flow is called resistance.
Unit: Ohm (Ω)
5. What is the rule of Om?
Answer:
V = I × R
(Voltage = Current × Resistance)
6. What's the difference between AC and DC?
AC
DC
Direction changes
Direction remains fixed
Frequency is ⚡Electrocal.guriji🙏
There is no frequency
Example: Home supply
Example: Battery
7. What is the formula of power?
Answer:
P = V × I
Unit: Watt (W)
8. What is power factor?
Answer:
Real Power / Apparent Power is called Power Factor.
Value: between 0 to 1
👉Practical / Panel Related Questions
9. What is MCC Panel?
Answer: Motor Control Center, which has many motor controls.
10. What is a DOL Starter?
Answer: Starter who gives full voltage directly to the motor.
11. Why use Star-Delta Starter?
Answer: To reduce the starting current of the motor.
12. What does the contactor work?
Answer: Remote is used to ON/OFF the circuit.
13. What is Relay?
Answer: Protection device that trips circuit when fault is done.
14. Difference between MCB and MCCB?
MCB
MCCB
Low current
High current
Fixed setting
Adjustable
Use in home
Use in the Industry
15. Why is earthing necessary?
Answer:
To protect from shock and send fault current to the ground.
👉 Safety Questions
16. Tell me 5 rules of Electrical Safety
Turn off the power
Wearing PPE (Helmet, Gloves)
Lockout/Tagout
Proper tools use
Install warning signs
17. What should be done when you feel shocked?
Answer:
Main supply OFF
Separate the person from wood/dry thing
Give medical help immediately
👉 Advance Questions
18. What is a transformer?
Answer: Device that increases or decreases voltage.
19. What is frequency?
Answer: Number of cycles per second in AC (Hz)
20. What are harmonics?
Answer: Unwanted frequencies in the system that damage equipment.
⚡Electrical.guruji⚡🙏 Copied

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