DC Machines PYQs (Part 3) | Kerala PSC - EEE

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🔗 Mastering DC Machines for Kerala PSC EEE Exam | Key Concepts & PYQs ⚡

Are you preparing for the Kerala PSC Electrical & Electronics Engineering (EEE) exams? 🚀 DC Machines is a crucial topic, and mastering it will significantly boost your exam performance.

🔍 What You’ll Learn in This Video:

✅ Working Principle of DC Motor & Generator – Understand how a DC motor operates based on Fleming’s Left-Hand Rule and how a DC generator functions using Fleming’s Right-Hand Rule.

✅ Back EMF & Speed Control in DC Motors – Learn the significance of back EMF in regulating armature current and various speed control methods, including:

Field Control
Armature Control
Ward-Leonard System
✅ Types of DC Motors & Generators – Explore Shunt, Series, and Compound Wound DC Motors and their applications. Understand the difference between separately excited and self-excited generators.

✅ Starting Methods and Motor Starters – Why is starting resistance required to protect the motor? Learn about DC motor starters and their role in reducing high starting current.

✅ Key Formulas & Numerical Problems – Solve important numerical questions, such as: 🔹 Calculating armature current in a long shunt DC compound generator
🔹 Finding the speed of a 4-pole lap-connected DC shunt motor
🔹 Determining load current in a DC series generator
🔹 Calculating the induced EMF in a 6-pole lap-wound DC generator
🔹 Torque calculation for a DC series motor

✅ Kerala PSC Previous Year Questions (PYQs) Covered:
✔ Function of yoke in DC machine
✔ Parallel paths in a 4-pole wave-wound DC machine
✔ Shape of field flux waveform for maximum generated EMF
✔ Voltage equation of a DC motor
✔ Effect of flux reduction on speed
✔ Commutation process and sparkless commutation methods
✔ Why carbon brushes are preferred over copper brushes
✔ Starter requirements for DC motors in industries
✔ Best speed control method for DC motors (below & above normal speeds)
✔ Commutator segment materials
✔ Effect of interchanging supply terminals in a DC shunt motor
✔ Why hysteresis loss depends on flux density, iron volume, and frequency
✔ Method to reverse polarity in a DC generator
✔ Use of DC motors in heavy construction trucks
✔ Best type of generator for long-distance power distribution
✔ Methods for load sharing in parallel DC generators
✔ Why some generators fail to build up voltage
✔ Function of split rings in a DC generator
✔ Effect of armature reaction on the main field flux
✔ Formula for dynamically induced EMF
✔ Which rule determines the direction of induced EMF?
✔ Number of parallel paths in duplex wave winding of an 8-pole generator
✔ What happens when load is increased from no-load to full load in a DC shunt motor?

📖 This session simplifies DC Machines, helping you grasp key principles and problem-solving strategies for Kerala PSC EEE exams. 🚀

Stay ahead in your preparation and boost your confidence with previous year questions! 🔥💡

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🎯 Who Should Watch?
✔️ Kerala PSC aspirants for EEE-related posts (Tradesman, Overseer, Lineman, Assistant Engineer, etc.)
✔️ B.Tech/Diploma Electrical & Electronics Engineering students
✔️ Competitive Exam Candidates preparing for electrical circuit analysis

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