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Gujarat Technological UniversitySummer 2025 Examination

GTU 3110006 Basic Mechanical Engineering (BME) Summer 2025 Paper Solution & PDF

B.E. · Common Engineering · Semester 1 · Subject Code: 3110006
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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
Jump toQ1Q2Q3Q4Q5

Question 1

14 MarksMedium
(a)
Write a short note on “Global Warming and solar energy”
3 Marks
(b)
Write the mathematical form of the First Law and explain each term.
4 Marks
(c)
Derive the characteristics gas equation for a perfect gas with usual notations.
7 Marks

Question 2

14 MarksMedium
(a)
Differentiate between heat and work in the context of the First Law.
3 Marks
(b)
Name the types of prime movers based on the source of energy.
4 Marks
(c)
Explain vapour compression refrigeration cycle used in domestic refrigerator.
7 Marks
OR OPTION
(c)

How much heat to be added to convert 4kg water at 20 °C into steam at 8 bar and 200 °C. take Cp of superheated steam as 2.1 KJ/kg and specific heat of water of water as 4.187 KJ/kgK.

7 Marks

Question 3

14 MarksMedium
(a)
With usual notations prove that Cp – Cv= R.
3 Marks
(b)

The engine working on ideal Otto cycle. The temperature at the beginning and at the end of compression is 50 °C and 400 °C. Calculate the air standard efficiency and compression ratio.

4 Marks
(c)

Explain with neat sketch throttling calorimeter. Also state its advantages and disadvantages.

7 Marks
OR OPTION
(a)
Explain open system, closed system and isolated system.
3 Marks
(b)
Write a difference between SI engine and CI engine
4 Marks
(c)

Derive an expression of air standard efficiency of Diesel cycle. Draw its P-V and T-S diagram.

7 Marks

Question 4

14 MarksMedium
(a)
Classify internal combustion Engine.
3 Marks
(b)
List out application of compressed air.
4 Marks
(c)
Explain with neat sketch Cochran boiler.
7 Marks
OR OPTION
(a)
How do you classify steam boilers?
3 Marks
(b)
Draw labeled diagram of Babcock and Wilcox boiler.
4 Marks
(c)
What is priming? Explain with neat sketch centrifugal pump.
7 Marks

Question 5

14 MarksMedium
(a)
Explain single acting reciprocating pump.
3 Marks
(b)
Write a short on a single plate (disc) friction clutch
4 Marks
(c)
Define following mechanical properties:
1)Elasticity
2)Malleability
3)Ductility
4)Stiffness
5)Hardness
6)Toughness
7)Resilience.
7 Marks
OR OPTION
(a)
Write function of clutch, Break and Coupling.
3 Marks
(b)
What is refrigerant? Describe the properties of good refrigerant.
4 Marks
(c)
Compare belt drive, chain drive and gear drive.
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 Mechanical Engineering (BME) (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.

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