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Gujarat Technological UniversityWinter 2025 Examination

GTU 3110005 Basic Electrical Engineering (BEE) Winter 2025 Paper Solution & PDF

B.E. · Common Engineering · Semester 1 · Subject Code: 3110005
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Total Marks70 MarksExternal theory exam
Passing Marks23 Marks33% minimum cutoff
Exam Duration2.5 Hours2:30 PM – 5:00 PM
Paper Structure5 QuestionsWith internal OR choices
Jump toQ1Q2Q3Q4Q5

Question 1

14 MarksMedium
(a)

Calculate current, resistance and energy consumed by an electric iron rated 230 V, 2 KW when used for 12 hours. What is the monthly energy bill at Rs. 5/- per unit?

3 Marks
(b)

Draw various types of alternating waveforms. Label peak, peak-to-peak, RMS and average value on sinusoidal AC waveform. Why are sinusoidal voltages preferred over other alternating voltages?

4 Marks
(c)

Write basic guidelines (Safety Rules) regarding the safe handling of electricity and electrical appliances. Mention various types of electrical safety devices.

7 Marks

Question 2

14 MarksMedium
(a)

A 100 V,100 W lamp is connected in series with a 100 V, 60W lamp across 200 V supply. Determine current drawn and power consumed by each lamp.

3 Marks
(b)
What are the limitations of the superposition theorem?
4 Marks
(c)
Find current in 2 Ω resistance by Thevenin’s theorem circuit shown in figure 1.

Also draw Thevenin’s equivalent circuit.

GTU Basic Electrical Engineering (3110005) Winter 2025 Question 2(c) Diagram
7 Marks
OR OPTION
(c)

Derive the expression for the voltage across the capacitor at any instant after the application of DC voltage V to a circuit with a capacitance C in series with resistance R. Define the time constant (τ) of the series RC circuit.

7 Marks

Question 3

14 MarksMedium
(a)

A balanced star connected load of 4+j3 Ω per phase is connected to a balanced 3- phase 400 V supply. Find the active power and reactive power.

3 Marks
(b)
Compare single phase alternating R-L circuit with R-C circuit.
4 Marks
(c)

Write short technical note on series RLC resonance. Plot the variation of impedance, current and power factor with respect to the signal frequency.

7 Marks
OR OPTION
(a)

A single-phase series RLC circuit having 50 Ω resistance, 0.1 H inductance and 50μF capacitance and it is connected with single phase 230 V, 50 Hz supply. Calculate the active power consumed by the circuit.

3 Marks
(b)

Draw Power triangle and impedance triangle for single phase R-L series circuit and write the formula of power factor from it.

4 Marks
(c)

Define power factor. What are the drawbacks of low power factor? Explain any one method to improve the power factor.

7 Marks

Question 4

14 MarksMedium
(a)
Compare core type and shell type transformer.
3 Marks
(b)
Write short note on B-H curve of magnetic materials.
4 Marks
(c)

Explain the principle of operation of the transformer. Draw the construction of transformer and write function of each part.

7 Marks
OR OPTION
(a)
Explain the principle of operation of induction motor.
3 Marks
(b)
Mention the advantages of induction motor over dc motor.
4 Marks
(c)
Draw construction of DC machine, label each part and write the function of each.
7 Marks

Question 5

14 MarksMedium
(a)
Explain the construction of the cable.
3 Marks
(b)
What is the necessity of earthing?
4 Marks
(c)
Differentiate fuse, MCB and MCCB.
7 Marks
OR OPTION
(a)
Compare equipment earthing with neutral earthing.
3 Marks
(b)
Write a short technical note on battery maintenance.
4 Marks
(c)

Elaborate various methods of earthing. 07 (Q. 2-C) Fig.

1 Marks
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About this Examination Paper & Attribution

Official Gujarat Technological University (GTU) examination paper and step-by-step solutions for Basic Electrical Engineering (BEE) (Winter 2025, B.E. · Common Engineering, Sem 1). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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