JNTU
JNTU B.Tech III FUNDAMENTALS OF MECHANICAL ENGINEERING Previous Question Paper (August/September - 2024 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Define the zeroth law of thermodynamics.
Answer
The zeroth law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. This law forms the basis for the measurement of temperature.
What are the limitations of the first law of thermodynamics?
Answer
The first law of thermodynamics has the following limitations: 1) It does not specify the direction in which a process can occur. 2) It does not provide information regarding the feasibility or quality of energy transformation. 3) It does not indicate the extent to which heat can be converted into work.
Define Boyle’s law.
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What are saturation states?
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State the four processes of the Otto cycle.
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What is the compression ignition engine? Why is the compression ratio of such an engine more than that of an SI engine?
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Difference between Pump and Turbine.
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What is the difference between Air-conditioning and refrigeration?
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List out the various chain drives used for power transmission.
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What is an open belt drive? Write its applications.
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Part B
A domestic refrigerator is loaded with food, and the door is closed. During a certain period, the machine consumes 1kWh of energy and the system's internal energy drops by 5000kJ. Find the net heat transfer for the system.
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Describe the constructional details of flat plate collectors.
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The properties of certain fluids are related as follows u=196+0.718t, pν=0.287(t+273). Where u is specific internal energy(kJ/kg), t is in 0C, p is pressure(kN/m2), ν is the specific volume (m3/kg). For this fluid, find Cv and Cp.
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How can solar energy be converted into electrical energy? Give a diagram showing the elements of such a plant.
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Water at 400C is continuously sprayed into a pipeline carrying 5 tonnes of steam at 5 bar, 3000C per hour. At a section downstream where the pressure is 3 bar, the quality is to be 95%. Find the rate of water spray in kg/h.
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What are the Feed pump, super heater, and Economizer?
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Derive the expression for the difference in heat capacity, Cp and Cv.
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Explain the working of the Locomotive Boiler.
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A Carnot engine has an efficiency of 0.5. Find the COP of a refrigerator working within the same temperature limit.
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Differentiate two-stroke and four-stroke engines.
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What is an internal combustion engine? How it is classified.
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Write a short note about the Otto cycle and Diesel cycle and draw its PV diagram.
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With a neat sketch, explain the operation of the Reciprocating pump.
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Explain the vapor compression refrigeration system with a neat sketch.
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What is the multi-stage compression? What are the advantages of multistage over single-stage compression?
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Define dew point temperature, Absolute humidity, and wet bulb depression.
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Differentiate Universal and Oldham coupling.
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What is brake? Write the classification of brakes.
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What is rigid coupling? Explain any one rigid coupling with a neat sketch.
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List out the applications of Ferrous and Nonferrous metals.
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