Power Systems – Multiple Choice Questions (MCQs)

1. 1. Which of the following is a primary source of energy for thermal power plants?

   • A. Coal
   • B. Hydro
   • C. Solar
   • D. Wind

2. 2. What is the main function of a transformer in a power system?

   • A. To convert AC to DC
   • B. To change voltage levels
   • C. To store electrical energy
   • D. To generate electricity

3. 3. Which type of power plant utilizes the kinetic energy of water to generate electricity?

   • A. Thermal
   • B. Nuclear
   • C. Hydroelectric
   • D. Geothermal

4. 4. The per-unit system simplifies power system calculations by:

   • A. Eliminating the need for transformers
   • B. Normalizing quantities to a common base
   • C. Reducing system losses
   • D. Increasing system stability

5. 5. What is the typical voltage level for high-voltage transmission lines?

   • A. 11 kV
   • B. 33 kV
   • C. 132 kV
   • D. 400 V

6. 6. A circuit breaker is primarily used for:

   • A. Voltage regulation
   • B. Current limiting
   • C. Fault interruption
   • D. Power factor correction

7. 7. What is the purpose of a lightning arrester in a power system?

   • A. To protect against overcurrent
   • B. To reduce voltage fluctuations
   • C. To divert lightning surges to ground
   • D. To improve power factor

8. 8. Which of the following is NOT a type of protective relay?

   • A. Overcurrent relay
   • B. Under-voltage relay
   • C. Distance relay
   • D. Load current relay

9. 9. The sag in overhead transmission lines is affected by:

   • A. Conductor material
   • B. Span length
   • C. Temperature
   • D. All of the above

10. 10. What is the full form of HVDC in power systems?

    • A. High Voltage Direct Current
    • B. High Voltage Distribution Control
    • C. Heavy Voltage Direct Current
    • D. High Velocity Direct Current

11. 11. Which component is responsible for generating electricity in a power plant?

    • A. Boiler
    • B. Turbine
    • C. Generator
    • D. Condenser

12. 12. What is the primary advantage of interconnected power systems?

    • A. Increased reliability
    • B. Reduced cost of generation
    • C. Better load management
    • D. All of the above