Electrical interview questions
500 questions with model answers, in four levels. Start with Basic, check yourself honestly, then move up.
Basic questions
- Circuit Theory (13)
- Electromagnetics (13)
- Transformers (13)
- DC Machines (12)
- Induction Machines (12)
- Synchronous Machines (12)
- Power Generation (13)
- Transmission & Distribution (13)
- Protection & Switchgear (13)
- Power Electronics (12)
- Electrical Measurements (12)
- Electrical Safety, Wiring & Drives (12)
Intermediate questions
- Circuit Theory (13)
- Electromagnetics (12)
- Transformers (13)
- DC Machines (12)
- Induction Machines (13)
- Synchronous Machines (12)
- Power Generation (12)
- Transmission & Distribution (13)
- Protection & Switchgear (13)
- Power Electronics (13)
- Electrical Measurements (12)
- Electrical Safety, Wiring & Drives (12)
Advanced questions
- Circuit Theory (11)
- Electromagnetics (10)
- Transformers (11)
- DC Machines (10)
- Induction Machines (11)
- Synchronous Machines (10)
- Power Generation (10)
- Transmission & Distribution (11)
- Protection & Switchgear (11)
- Power Electronics (10)
- Electrical Measurements (10)
- Electrical Safety, Wiring & Drives (10)
Tricky questions
- Circuit Theory (7)
- Electromagnetics (6)
- Transformers (7)
- DC Machines (6)
- Induction Machines (6)
- Synchronous Machines (6)
- Power Generation (6)
- Transmission & Distribution (6)
- Protection & Switchgear (7)
- Power Electronics (6)
- Electrical Measurements (6)
- Electrical Safety, Wiring & Drives (6)
Sample questions
- What are Kirchhoff's laws?
- What is the force on a current-carrying conductor in a magnetic field?
- Where are DC series motors used?
- What are the main types of power plants?
- What is the efficiency of a transmission line?
- What is the output voltage of an ideal buck converter?
- How do you improve power factor?
- What are the losses in a transformer?
- Why can't an induction motor run at synchronous speed?
- How does a governor control generator frequency?
- What is the inverse definite minimum time (IDMT) characteristic?
- What is the ripple factor of a rectifier?
- A 415 V, 50 Hz three-phase plant draws 100 kW at 0.7 PF lagging. What capacitor bank raises PF to 0.95?
- How does transformer differential protection avoid tripping on inrush current?
- What causes bearing currents in VFD-fed motors and how are they mitigated?
- How does HVDC compare with HVAC transmission?
- What harmonics does a six-pulse rectifier produce and how does twelve-pulse help?
- "Can the neutral wire carry current?"
- Should brushes always sit at the geometric neutral axis?
- "Is a higher-rated fuse safer?"