Fundamentals of Electrical Engineering — Major (End Semester) 2022 question paper

Paper details

• Subject: Fundamentals of Electrical Engineering (BEE-101)
• Branch: Computer Science and Engineering
• Semester: 1
• Exam: Major (End Semester) 2022
• Questions: 24

Questions asked in Fundamentals of Electrical Engineering Major (End Semester) 2022

1. Q1. Attempt any five parts of the following:
2. Q1(a). Explain the difference between a circuit and a network. [2 marks]
3. Q1(b). State & explain Norton's theorem. [2 marks]
4. Q1(c). Discuss the following terms: (i) active and passive elements (ii) unilateral and bilateral elements [2 marks]
5. Q1(d). Draw graphical representation of impedance and current with respect to frequency in a parallel resonance circuit. [2 marks]
6. Q1(e). Explain the analogy between electric and magnetic circuit. [2 marks]
7. Q1(f). Explain the B-H curve of a magnetic material. [2 marks]
8. Q1(g). Why does a single-phase induction motor not develop starting torque? Explain. [2 marks]
9. Q2. Attempt any two parts of the following:
10. Q2(a). Find $i_x$ and $v_x$ in the circuit given below: [5 marks]
11. Q2(b). Define Thevenin's theorem. Find Thevenin's voltage and Thevenin's resistance across terminals A and B for the circuit shown in Fig.2: [5 marks]
12. Q2(c). (i) Explain Superposition theorem.(ii) Three resistances of $25$, $30$, and $35\text{ ohms}$ are connected in delta. Calculate the corresponding resistances in an equivalent star connection. [5 marks]
13. Q3. Attempt any two parts of the following:
14. Q3(a). An alternating voltage is given by $v = 141.4 \sin(314t)$. Find:(i) frequency(ii) RMS value(iii) average value(iv) the instantaneous value of voltage, when $t$ is $5\text{ millisecond}$(v) the time taken for the voltage to reach $50\text{ volt}$ for the first time after passing through zero value. [5 marks]
15. Q3(b). The voltage and current in a circuit with $50\text{Hz}$ supply are represented as follows:$v = 280 \sin(\omega t)$$i = 14.14 \sin(\omega t - \pi/6)$Find: (i) RMS value of current, (ii) Average value of voltage, (iii) Power consumed in the circuit, (iv) Draw the phasor diagram of current and voltage. [5 marks]
16. Q3(c). (i) Write the necessity and advantages of the three-phase system. (ii) Discuss apparent power, active power, reactive power, leading power factor, and lagging power factor. [5 marks]
17. Q4. Attempt any two parts of the following:
18. Q4(a). A ring of ferromagnetic material has a rectangular cross-section. The inner diameter is $20\text{ cm}$, the outer diameter is $24\text{ cm}$, and the thickness is $4\text{ cm}$. There is a coil of $600\text{ turns}$ wound on the ring. When the coil carries a current of $2.5\text{ A}$, the flux produced in the ring is $1.2 \times 10^{-3}\text{ Wb}$. Find: (i) magnetic field intensity, (ii)… [5 marks]
19. Q4(b). Explain the working of a single-phase auto-transformer and mention its applications. Show that there will be a saving of copper in an auto-transformer in comparison to a same rating two-winding transformer. [5 marks]
20. Q4(c). Discuss the principle of operation of a single-phase transformer; also draw its equivalent circuit. Derive the EMF equation for a single-phase transformer. [5 marks]
21. Q5. Attempt any two parts of the following:
22. Q5(a). Explain the torque-speed characteristic and speed control of a separately excited DC motor. [5 marks]
23. Q5(b). Explain the principle of operation of a three-phase induction motor and also explain its torque-slip characteristics with a suitable diagram. [5 marks]
24. Q5(c). Explain the principle of operation of a single-phase induction motor. Also, write the applications of the single-phase induction motor. [5 marks]