What is the exam pattern and passing mark for GTU Advanced Machine Design (3171925)?

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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Gujarat Technological UniversitySummer 2026 examination

GTU 3171925 Advanced Machine Design Summer 2026 Question Paper & PDF

B.E. · Mechanical Engineering · Semester 7 · Subject code 3171925

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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

Explain three modes of fracture with neat sketches.

(b)

4 marks

Explain:

i)Surface fatigue damage

ii)Stress intensity factor (SIF).

(c)

7 marks

What is stress concentration? Explain terms theoretical stress concentration Factor and fatigue stress concentration factor. Establish a relation between them.

Q.2

14 Marks

(a)

3 marks

Discuss limitations of LEFM.

(b)

4 marks

What is Mechanical Seal?State the required properties of material for mechanical seal.

(c)

7 marks

Compare in detail with examples adhesive and abrasive wear.

(c)

7 marks

Using the Griffith approach, justify that critical stress required to advance a crack for plane stress cases is a function of modulus E, surface energy γ, crack length a.

Q.3

14 Marks

(a)

3 marks

Explain the Sherby-Dorn and Larson-Miller creep parameters .

(b)

4 marks

Explain the Creep curves and stress relaxation

(c)

7 marks

A circular bar of 500 mm length is supported freely at its two ends. It is acted upon by a central concentrated cyclic load having a minimum value of 20 kN and a maximum value of 50 kN. Determine the diameter of bar by taking a factor of safety of 1.5, size effect of 0.85, surface finish factor of 0.9. The material properties of bar are given by : ultimate strength of 650 MPa, yield strength of 500 MPa and endurance strength of 350 MPa. Take Fatigue stress concentration factor as 1.Compare the design according to Goodman’s formulae and Soderberg’s formulae.

(a)

3 marks

Explain the types of creep.

(b)

4 marks

Explain the factors affecting the creep.

(c)

7 marks

The work cycle of a mechanical component subjected to completely reversed bending stresses consists of the following three elements:

i)± 350 N/mm2 for 85% of time

ii)± 400 N/mm2 for 12% of time

iii)± 500 N/mm2 for 3% of time The material for the component is 50C4 (Sut=660 N/mm2) and the corrected endurance limit of the component is 280 N/mm2. Determine the life of the component.

Q.4

14 Marks

(a)

3 marks

Distinguish the difference between high-cycle fatigue and low-cycle fatigue.

(b)

4 marks

What are the important theories of elastic failures & explain why it is required to consider?

(c)

7 marks

Explain

1)Miner’s rule for cumulative damage in fatigue.

2)The strain based approach to determine fatigue life.

(a)

3 marks

What are the factors that may affect S-N curves.

(b)

4 marks

Discuss the Strain versus Life Curve for variable load.

(c)

7 marks

Derive relationship between crack tip opening displacement (CTOD) and stress intensity factor for Mode I (KI) for small scale yielding.

Q.5

14 Marks

(a)

3 marks

Explain SINES METHOD for assessment of fluctuating simple multiaxial stresses.

(b)

4 marks

Define:

i)Failure due to fatigue

ii)Failure due to creep

(c)

7 marks

What is Mechanical Housing? Discuss stresses and deformation induced in housing.

(a)

3 marks

What is simple Multi axial stresses and complex multi axial stresses?

(b)

4 marks

Write the three effects of creep on life of machine element.

(c)

7 marks

Explain the following

1Split Housing 2. Non Contact Seals.

Other Semester 7 subjects

BE Mechanical

2171901

Operation Research

2171903

Computer Aided Manufacturing

2171909

Machine Design

2171910

Power Plant Engineering

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About this paper

Official Gujarat Technological University (GTU) examination paper for Advanced Machine Design (Summer 2026, B.E. · Mechanical Engineering, Sem 7). 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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