Question 1
(a)
State Ohm’s law and Kirchhoff’s laws.
3 Marks
(b)
Define power factor. Write the disadvantages of low power factor.
4 Marks
(c)
Derive the equation of star to delta and delta to star transformation.
7 Marks
Gujarat Technological UniversitySummer 2025 Examination
GTU 3110005 Basic Electrical Engineering (BEE) Summer 2025 Paper Solution & PDF
B.E. · Common Engineering · Semester 1 · Subject Code: 3110005
Total Marks70 MarksExternal theory exam
Passing Marks23 Marks33% minimum cutoff
Exam Duration2.5 Hours10:30 AM – 1:00 PM
Paper Structure5 QuestionsWith internal OR choices
Question 2
(a)
Write the advantages and disadvantages of polyphase systems.
3 Marks
(b)
Define: (i) Form factor (ii) Peak factor (iii) Frequency and (iv) Cycle.
4 Marks
(c)
State and explain Thevenin’s theorem with suitable example.
7 Marks
OR OPTION
(c)
A 100 V, 100-Watt lamp is connected in series with a 100 V, 60-watt lamp across 200 V supply. Determine current drawn and power consumed by each lamp.
7 Marks
Question 3
(a)
Define: (i) Active power (ii) Reactive power and (iii) apparent power in ac circuits.
3 Marks
(b)
Explain the comparison between series resonance and parallel resonance condition in ac circuits.
4 Marks
(c)
Prove that current in purely inductive circuit lags its voltage by 90 degree and average power consumption in pure inductive circuit is zero.
7 Marks
OR OPTION
(a)
Define and explain RMS value and average value in ac circuits.
3 Marks
(b)
Derive an expression for impedance, current and power factor for an R-L-C series circuit when supplied with ac voltage. Also draw the phasor diagram.
4 Marks
(c)
Derive the relationship between line voltage and phase voltage, line current and phase current in a 3-phase balanced star connected circuit
7 Marks
Question 4
(a)
Define transformer. Write the main parts of transformer.
3 Marks
(b)
Compare auto transformer with two winding transformers.
4 Marks
(c)
Explain various connections of 3-phase transformers with necessary diagrams.
7 Marks
OR OPTION
(a)
Write the advantages and disadvantages of auto transformer.
3 Marks
(b)
Write the types of 1-phase induction motors. Explain any one of them.
4 Marks
(c)
Explain construction and working of synchronous generator with necessary diagram.
7 Marks
Question 5
(a)
Compare squirrel cage induction motor with slip ring induction motor.
3 Marks
(b)
Explain the types of dc motors with diagrams.
4 Marks
(c)
Define earthing. Explain plate earthing with diagram.
7 Marks
OR OPTION
(a)
Give a list of safety devices used for home appliances.
3 Marks
(b)
Write the comparison of Fuse, MCB and ELCB.
4 Marks
(c)
A series R-L-C circuit having a resistance of 8 Ω, inductance of 80 mH and capacitance of 100 μF is connected across a 150 Volt, 50 Hz supply. Calculate (i) the current (ii) the power factor and (iii) the voltage drops in the coil and capacitance.
7 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) (Summer 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.