"Electrical Engineering Hard Quiz | GATE | AE | JE" SET1

Electrical Engineering Hard Level Objective Questions: इस पोस्ट में दिए गए हैं सबसे कठिन इलेक्ट्रिकल इंजीनियरिंग MCQs जो GATE, UPPCL, SSC JE, Diploma, और AE Exams के लिए उपयोगी हैं। प्रत्येक प्रश्न में Show/Hide Answer बटन है और यह पूरी तरह Copy-Protected Quiz है।

⚡ Electrical Engineering – Hard Level MCQs (Objective Type)

1. In a 3-phase induction motor, why does the rotor never achieve synchronous speed?
   Because if rotor reaches synchronous speed, there would be no relative motion between rotor and rotating magnetic field, hence no induced EMF.
2. What is the function of a Buchholz relay?
   It detects internal faults (like short-circuits or gas generation) in oil-immersed transformers.
3. Which component is used to improve the voltage regulation of a synchronous generator?
   Automatic Voltage Regulator (AVR)
4. What is Ferranti effect in power systems?
   Receiving end voltage becomes higher than sending end voltage in lightly loaded long transmission lines.
5. Which fault is most severe in a power system?
   3-phase symmetrical fault
6. Which device converts AC to DC with controlled output voltage?
   Controlled Rectifier
7. Why is the neutral wire grounded?
   To maintain system voltage stability and ensure safety during faults
8. What is the purpose of using high voltage for power transmission?
   To reduce I²R losses and increase efficiency
9. What happens to synchronous impedance with increase in load?
   It remains constant (it is a machine constant)
10. In protection, what is the function of a CT (Current Transformer)?
    To step down high currents for measurement and relay operation