PYQ – FUNDAMENTAL OF ELE. & ELO. ENGG. (2420103) | SEMESTER 1ST AND 2ND (1ST YEAR) | Year 2025

Fundamental of Electrical and Electronics Engineering 2025 PYQ.

(Sem – I & II) Diploma Exam 2025 (Even)

(C.S.E) (Theory)

[Time: 3 Hours]             Fundamental of Electrical & Electronics (2420103)        [Full. Marks:70]

-   All questions are compulsory.

-   Marks are mentioned on the right side of each question.

Group A

 

Choose the most suitable answer from the following options: -   (1*20=20)

(i) In a parallel circuit, if ‘n’ resistors, each of ‘R’ Ω  are connected in parallel, then the total resistance is equal to ________.

(a) (R/n

(b) (R²)/n

(c) nR

(d) nR²

(ii) In series-parallel combination of resistance, the minimum number of resistance required is _____.

(a) 1

(b) 2

(c) 3

(d) 4

(iii)  The ____________ Law states that, the line integral of the magnetic field around some closed loop is equal to 'μ0' times the algebraic sum of the currents which pass through the loop.

(a) Ampere’s circuital

(b) Lorentz

(c) Biot-savart’s

(d) Kirchoff’s

(iv) The reactance of capacitor at 50 Hz is 5Ω. If the frequency is increased to 100 Hz, the new reactance is ……… 

(a) 5Ω                                       

(b) 10Ω

(c) 2.5Ω

(d) 12.5Ω

(v) Unit of reluctance is ……..

(a) ampere-turnsWb;

(b) ampere-turns²/Wb;

(c) Wb/ampere-turns;

(d) ampere-turns/Wb

(vi) Which of the following Boolean expressions is ‘NOT TRUE’?

(a) A + 1 = A

(b) A + A’ = 1

(c) A . A = A

(d) A . A’ = 0

 

(vii) For elements having energy gap more than 5 ev, act as…….  

(a) Semiconductors

(b) Insulators

(c) Superconductors

(d) Conductors

(viii) ………..of a transistor is heavily doped and emits majority carriers, either electron or holes.

(a) Collector

(b) Emitter

(c) Base and emitter

(d) Base

(ix) ………. Operation is the dual of AND operation.

(a) OR

(b) NOR

(c) NOT

(d) NAND

 
(x) All Digital circuit can be made using only _________ gates.

(a) AND

(b) NOT

(c) OR

(d) NOR

 

Group:-"B"

➥ Answer all Five Questions: -                         (5*4=20) 

 

2. Explain the heating and magnetic effect of electric current.

OR

Explain (1) ideal and practical voltage source (2) AC and DC current.

 

3. Explain the following : (1) Power factor (2) from factor (3) Peak factor (4) RMS value.

OR

Explain the following (1) Active and Passive element (2) Linear & Non-linear Circuit.

 

4. Describe the analogy between electric and magnetic circuits.  

OR

Differentiate between statically and dynamically induced EMF.

 

5. Describe the types of semiconductors and their materials.  

OR

Describe the working principle of an NPN transistor.

 

6. State and explain DE Morgan’s Law. 

OR

Write the truth table of NOT, OR and AND gate. Draw their symbols.

 

Group:- "C"

➥ Answer all Five Questions: -                         (5*6=30) 

 

7. (1) Derive the expression for capacitance of a parallel plate capacitor.

    (2) Five capacitors each of 5 μf  are connected in series, calculate the equivalent capacitance

OR

Describe self and mutual inductance.

Two coils having self-inductance of 30 H and 40 H are connected in series opposing connection. Find total inductance of the series connection, if the mutual inductance between the coils is 0.5 H.

 

     8. If an AC circuit has an impedance Z= R+jX , where R is the resistance and X is the reactance, and the source provides a voltage V= 100<30° , calculate the current in the circuit for the following  impedances:

     a) Z= 10+j0Ω

     b) Z= 10+j10Ω

     c) Z= 10-j10Ω

 OR

 

9. State and explain Faraday’s Law of Electromagnetic induction and Lan’z law   

OR

Draw and explain a typical B-H curve for a ferromagnetic material.

 

10. Draw and explain the V-I characteristics of a diode in forward and reverse bias.  

OR

Describe the operation and characteristics of JFET.

 

11. (1) Convert (157)₈ to decimal.

      (2) Convert (45)₈ to binary.

      (3) Convert (10101111)₂ to hexadecimal.  

OR

By using logic gates, Implement the expression: Y = (A∙B) + (C∙D)

 

 

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