Principles of Electrical Engineering 2018 Question Paper — Government…
The 2018 Principles of Electrical Engineering previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.
- University: Government College of Engineering and Technology, Jammu
- Subject: Principles of Electrical Engineering
- Course: BASIC ELECTRICAL ENGINEERING
- Branch: BE - II/6(A)
- Year: 2018
- Paper: end-term
- Duration: 180 minutes
- Total marks: 100
Instructions
- Attempt Five questions in all, Selecting atleast two questions from each section.
- Assume Suitable data wherever missing.
Questions
SECTION - A
Attempt atleast two questions from this section.
- Q1. a) Using Mesh Analysis, obtain the current through $5\ \Omega$ resistor in the circuit shown:- [10 marks]
- Q1. b) State and explain Thevenin theorem with suitable example. [10 marks]
- Q2. a) Determine the current supplied by the source in the circuit shown:- [10 marks]
- Q2. b) Discuss graphically Resonance in series RLC circuit. [10 marks]
- Q3. a) Derive an expression for impedance, current and power factor for a series RLC circuit when applied with AC voltage. Also draw the vector diagram. [10 marks]
- Q3. b) A supply of $400\text{ V}, 50\text{ Hz}$ is applied to a series RC circuit. Find the value of capacitance if the power absorbed by the resistor be $500\text{ W}$ and voltage across resistor is $150\text{ V}$. Also find the energy stored in capacitor. [10 marks]
- Q4. a) Obtain the relation between line voltage and phase voltage in a star connected 3-phase system using phasor diagram. [10 marks]
- Q4. b) In Two Wattmeter Method. Power measured is $30\text{ kW}$ at $0.7\text{ pf}$ lagging. Find the reading of each Wattmeter. [10 marks]
SECTION - B
Attempt atleast two questions from this section.
- Q5. a) Discuss Open Circuit and Short Circuit Tests performed in Transformer. [10 marks]
- Q5. b) Explain the working operation of Practical Transformer under no-load condition with neat Phasor Diagram. [10 marks]
- Q6. a) Derive an emf equation of dc generator. What will be the change in emf induced if flux is reduced by $20\%$ and speed is increased by $20\%$. [10 marks]
- Q6. b) Explain principle of operation of Synchronous Generator. [10 marks]
- Q7. a) A $5\text{ hp}, 230\text{ V}, 50\text{ Hz}$ Induction Motor has a rated Full-load speed of $950\text{ rpm}$. The Induced voltage per phase of rotor at standstill is $100\text{ V}$. Calculate i) Number of Poles and $\%$ full-load slip, ii) Rotor Induced Voltage and its Frequency at full load. [10 marks]
- Q7. b) Derive an expression for Torque in dc motor. [10 marks]
- Q8. Write a short notes on the following:- i) Power Factor Improvement ii) Earthing. [20 marks]