What is the exam pattern and passing mark for GTU Electrical Machine- I (3140913)?

The GTU theory examination carries 70 total marks with a duration of 2.5 Hours. Minimum passing criteria is 23 marks (33%). The paper consists of 5 main questions with official marking breakdown and internal choices.

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The official GTU question paper PDF is linked directly from Gujarat Technological University's official examination archive. You can view the full paper online or download the original file.

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Gujarat Technological UniversitySummer 2026 examination

GTU 3140913 Electrical Machine- I Summer 2026 Question Paper & PDF

B.E. · Electrical Engineering · Semester 4 · Subject code 3140913

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Total: 70 marks
To pass: 23 marks (33%)
Duration: 2.5 Hours 10:30 AM – 1:00 PM
Questions: 5 with internal choice

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Q.1

14 Marks

(a)

3 marks

Explain with equation , the term ‘voltage regulation of a transformer’.

(b)

4 marks

Give classification of DC generators with neat connection diagram

(c)

7 marks

Explain OC and SC test of single phase transformer. Also derive equations to obtain parameters can be obtained from it.

Q.2

14 Marks

(a)

3 marks

List out parts of D.C machine and briefly discuss any two.

(b)

4 marks

Derive an EMF equation of transformer

(c)

7 marks

Explain the terms

1)Pole pitch

2)Full pitch coil

3)Front pitch

4)Back pitch in relation to armature winding of a DC machine

(c)

7 marks

A Shunt DC generator delivers 195 A at a terminal voltage 250 V. The armature resistance and shunt field resistance are 0.02 ohm and 50 ohm respectively . The iron and friction losses equals to 950 W . Find E.M.F. generated b. Copper losses c. Output of prime mover

dCommercial , Mechanical and Electrical efficiencies

Q.3

14 Marks

(a)

3 marks

Explain Biot Savart'S Law.

(b)

4 marks

State the condition for parallel operation of three phase transformer.

(c)

7 marks

Draw operating characteristics of DC shunt, series and compound wound motors.

(a)

3 marks

Explain Energy Stored in a Magnetic Field.

(b)

4 marks

Draw and explain DC three point starter.

(c)

7 marks

Find the no load and full load speed , for a 4- pole, 220 V, 20 KW, DC Shunt motor having following data. Full load current= 5 A, armature resistance = 0.04 ohm Flux per pole = 0.04 Wb, no. of armature conductors =160, Wave connection, Full load current = 95 Amp, No load current = 9 Amp. , Neglect armature reaction effect,

Q.4

14 Marks

(a)

3 marks

Explain voltage build up process in DC Shunt Generator

(b)

4 marks

What is Tap Changer? Explain on load tap changer and off load tap changer of transformer.

(c)

7 marks

Compare , an auto transformer with a two-winding transformer, with aspect to construction, application and performance.

(a)

3 marks

What is commutation in DC machine ? List out methods to improve it.

(b)

4 marks

Derive the torque equation of a DC motor from first principles

(c)

7 marks

Explain the methods of speed control on DC shunt motor.

Q.5

14 Marks

(a)

3 marks

Why starter is necessary for DC motor ?

(b)

4 marks

Define Armature reaction in DC Generator. Explain effect of it on performance of Machine in brief.

(c)

7 marks

A 3- phase , 33 / 6.6 KV, delta/ star, 2- MVA transformer has a primary resistance of 8 ohm/ phase and a secondary resistance of 0.08 ohm / phase. The % impedance is 7 % . Calculate the secondary voltage with rated primary voltage and hence the regulation for full load 0.75 p.f. lagging condition.

(a)

3 marks

List the applications of different types of DC motors.

(b)

4 marks

Draw the vector diagrams and winding connections for the following transformer connections.

1)Dd0

2)Yd1

(c)

7 marks

Explain with diagram and equations , the Swinburn’s test for a DC shunt machine

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About this paper

Official Gujarat Technological University (GTU) examination paper for Electrical Machine- I (Summer 2026, B.E. · Electrical Engineering, Sem 4). 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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