INTRODUCTION TO ELECTRICAL ENGINEERING — Major (End Semester) 2023 question paper

Paper details

• Subject: INTRODUCTION TO ELECTRICAL ENGINEERING (BEE - 104)
• Branch: Chemical Engineering
• Semester: 1
• Exam: Major (End Semester) 2023
• Questions: 24

Questions asked in INTRODUCTION TO ELECTRICAL ENGINEERING Major (End Semester) 2023

1. Q1(a). Define and explain Kirchhoff's current and voltage laws. [2 marks]
2. Q1(b). Explain voltage source to current source conversion. Give an example with the help of a suitable diagram. [2 marks]
3. Q1(c). Explain the following terms: i) Linearity and Nonlinearity ii) Unilateral and Bilateral Elements [2 marks]
4. Q1(d). Define the following terms: Power Factor, Active Power, and Reactive Power [2 marks]
5. Q1(e). Explain the concept of bandwidth and quality factor for a series RLC circuit. [2 marks]
6. Q1(f). Explain magnetic and electric circuits. Give analogy between them. [2 marks]
7. Q1(g). Draw and explain B-H curve. [2 marks]
8. Q2(a). Find the currents in all the resistive branches of the circuit as shown in Fig. 2(a). [5 marks]
9. Q2(b). Three resistances of $20\ \Omega$ each are connected in star. Find the equivalent delta resistance. If source of emf of $120\text{ V}$ is connected across any two terminals of the equivalent delta-connected resistance, find the current supplied by the source [5 marks]
10. Q2(c). Applying the mesh analysis method, obtain the current through $5\text{-ohm}$ resistor as shown in Fig. 2(c). [5 marks]
11. Q3(a). Find the value of current flowing through $4\text{-ohm}$ resistance using Thevenin's Theorem as shown in Fig. 3(a). [5 marks]
12. Q3(b). Determine the current in $10\text{-ohm}$ resistance using Norton's Theorem as shown in Fig. 3(b). [5 marks]
13. Q3(c). Compute the power dissipated in $9\text{-ohm}$ resistor by applying superposition theorem for the circuit shown in Fig. 3(c). [5 marks]
14. Q4(a). Calculate the r.m.s. value, the form factor and peak factor of a periodic voltage shown in Fig. 4(a), having the following values for equal time intervals changing suddenly from one value to the next: 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, $-5$, $-10\text{ V}$ etc. What would be the r.m.s value of sine wave having the same peak value?[Stepped / Staircase Waveform overlaid with a dashed Sine… [5 marks]
15. Q4(b). A series R-L-C circuit consists of $R = 500\ \Omega$, $L = 50\text{ mH}$ and $C = 5\text{ picofarads}$. The applied voltage across the circuit is $200\text{ V}$. (i) Find the resonant frequency of the circuit. (ii) Find the quality factor of the circuit at the resonant frequency. (iii) At what angular frequencies do the half power points occur? (iv) Calculate the bandwidth of the circuit. [5 marks]
16. Q4(c). Explain the resonance curve in series RLC circuit and derive the half-power frequencies. [5 marks]
17. Q5(a). Define the following terms: (i) MMF (ii) Reluctance (iii) Magnetic potential (iv) Magnetisation curve (v) flux density [5 marks]
18. Q5(b). A single-phase $240/20\text{ V}$, $50\text{ Hz}$ transformer has the secondary full-load current of $180\text{ A}$. It has $45\text{ turns}$ on its secondary. Calculate (i) the voltage per turn, (ii) the number of primary turns, (iii) the full-load primary current, and (iv) the kVA output of the transformer. [5 marks]
19. Q5(c). Explain the working principle of an autotransformer. State the advantages and disadvantages of an autotransformer over two-winding transformer. What are the applications of autotransformer? [5 marks]
20. QQ1. Attempt any Five parts of the following. (All Units)
21. QQ2. Attempt any Two parts of the following. (Unit-I)
22. QQ3. Attempt any Two parts of the following. (Unit-II)
23. QQ4. Attempt any Two parts of the following. (Unit-III)
24. QQ5. Attempt any Two parts of the following. (Unit-IV)