Gujarat Technological UniversitySummer 2025 examination

GTU 3150910 Electrical Machine- II Summer 2025 Question Paper & PDF

B.E. · Electrical Engineering · Semester 5 · Subject code 3150910
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Why single phase induction motor is not self starting?
(b)
4 marks

Derive EMF equation of Alternator. Derive the E.M.F. equation of an Alternator. Derive the E.M.F. equation of an Alternator.

(c)
7 marks

Draw and explain torque-slip characteristics of 3 phase induction motor. Draw Slip Torque characteristic of 3 phase Induction motor and explain in brief. Draw Slip Torque characteristic of 3 phase Induction motor and explain in brief. Draw Slip Torque characteristic of 3 phase Induction motor and explain in brief. Draw Slip Torque characteristic of 3 phase Induction motor and explain in brief.

Q.2

14 Marks
(a)
3 marks
Explain the working principle of Induction generator.
(b)
4 marks
Explain the double field revolving theory of single-phase induction motor.
(c)
7 marks

State the methods of starting of synchronous motor and explain any one of them.

(c)
7 marks
Explain speed control method of 3 phase induction motor.

Q.3

14 Marks
(a)
3 marks
Explain the working principle of 3 phase induction motor.
(b)
4 marks
Write a short note on double cage induction motor.
(c)
7 marks
With diagram explain star-delta starter of 3 phase induction motor.
(a)
3 marks
Explain crawling and cogging in induction motor.
(b)
4 marks
Give comparison of squirrel cage and wound rotor motor.
(c)
7 marks
Explain no load and block rotor test of 3 phase induction motor.

Q.4

14 Marks
(a)
3 marks
Give comparison between salient pole and cylindrical type alternator.
(b)
4 marks
Explain armature reaction phenomena in case of synchronous machine.
(c)
7 marks

What is regulation of alternator? Explain ZPF method for finding regulation in alternator.

(a)
3 marks
Give condition for parallel operation of alternator with bus bar.
(b)
4 marks
Define the pitch factor and distribution factor for synchronous generator.
(c)
7 marks
Draw and explain V-Curve of synchronous motor.

Q.5

14 Marks
(a)
3 marks
Explain Synchronous condenser.
(b)
4 marks
Explain principle and operation of auto synchronous motor.
(c)
7 marks
Write a short note on universal motor.
(a)
3 marks
State advantages and applications of linear induction motor.
(b)
4 marks
Explain working of capacitor start capacitor run single phase motor.
(c)
7 marks

What is synchronization? Explain two bright and one dark lamp method of synchronization of 3 phase alternator.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Electrical Machine- II (Summer 2025, B.E. · Electrical Engineering, Sem 5). 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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