Q.1
14 Marks(a)
Explain with neat sketch: Open, Close and Isolated system.
(b)
Find expression of work done and change in internal energy for adiabatic process.
(c)
Discuss the primary causes of global warming. What are impacts of global warming?
Gujarat Technological UniversityWinter 2024 examination
GTU BE01000081 Basic Mechanical Engineering Winter 2024 Question Paper & PDF
B.E. · Common Engineering · Semesters 1 and 2 · Subject code BE01000081
- 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.2
14 Marks(a)
Write the statements for Boyle's law, Charles's law and Gay-Lussac’s law.
(b)
What do you mean by non metallic materials? Name any three non metallic materials and state its practical importance.
(c)
With a neat sketch explain Throttling calorimeter.
OR
(c)
5 kg of air is heated from 25° C to 150° C. Determine:
i)specific heats,
ii)change in internal energy,
iii)change in enthalpy and
iv)heat supplied. Assume
R = 0.287 kJ/kgK and γ = 1.4 for air and work done = 500 kJ.
Q.3
14 Marks(a)
State the assumptions made in working of Carnot cycle. Also write down the limitations of Carnot cycle.
(b)
An engine operation on an air-standard Otto cycle has a compression ratio equal to 7. The conditions at the start of compression are 0.1 MPa and 300 K. The pressure at the end of heat addition is 4 MPa. Determine:
i)thermal efficiency,
ii)net work done per kg of air. Take Cv = 0.718 kJ/kg , and γ = 1.4
(c)
Derive equation for air standard efficiency of diesel cycle.
OR
(a)
Give difference between SI and CI engines.
(b)
The following data were noted for a 4-cylinder, 4-stroke engine:
Diameter = 101 mm, stroke = 114 mm, engine speed = 1600 rpm, fuel consumption = 0.204 kg/min, heating value of fuel = 41,800 kJ/kg, difference in either side of the brake pulley = 378 N, brake pulley radius = 3.35 m. Assume mechanical efficiency = 83%. Calculate:
i)brake thermal efficiency,
ii)indicated thermal efficiency,
iii)fuel consumption per brake power.
(c)
Explain with neat sketch four stoke diesel engine.
Q.4
14 Marks(a)
What is priming? Why is it required in centrifugal pump?
(b)
Explain with P-V diagram need of multi staging in reciprocating air compressor.
(c)
Explain with neat sketch working of Babcock and Wilcox boiler.
OR
(a)
Define boiler. Also mention at least five essential requirements of a good boiler.
(b)
Give comparison between reciprocating and centrifugal pump.
(c)
What do you mean by mounting and accessories? Enlist different boiler mountings and accessories with their functions.
Q.5
14 Marks(a)
Define the terms: Refrigeration, Refrigeration effect and Coefficient of Performance.
(b)
Write down comparison between Belt, Chain and Gear drive.
(c)
Explain with neat sketch vapour compression refrigeration system.
OR
(a)
Define air conditioning. Also give the classification of air conditioning system.
(b)
Explain with a neat sketch working of internal expanding shoe brake.
(c)
What do you mean by the word ‘Friction clutches’? Explain with neat sketch working of a centrifugal clutch.
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About this paper
Official Gujarat Technological University (GTU) examination paper for Basic Mechanical Engineering (Winter 2024, 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.