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JNTU B.Tech II THERMAL SCIENCE Previous Question Paper (September/October - 2023 - R18)

B.Tech | II | II-I | R18 | September/October - 2023

Answer PaperPaper Code: 153BYMaximum Marks: 75Time: 3 Hours

Note: Part A is compulsory (25 marks). In Part B, Answer any one question from each unit (50 marks).

Part A

Answer all questions:

25 marks

Explain concept of thermodynamic equilibrium.

2 marks

Answer

A system is in thermodynamic equilibrium if it satisfies three conditions simultaneously:

Mechanical equilibrium: No unbalanced forces exist within the system or between the system and its surroundings (no pressure gradients).
Thermal equilibrium: The temperature remains uniform throughout the system and is equal to that of the surroundings.
Chemical equilibrium: There are no chemical reactions occurring and no net transfer of matter between phases or components.

Briefly explain the path function with example.

3 marks

Answer

A path function is a property whose value depends on the specific process or path taken to reach a state, rather than the state itself. Its differential is inexact (denoted by δ). Work and Heat are classic examples.

For instance, if a gas expands from state 1 to state 2, the work done (area under the P-v curve) varies significantly depending on whether the process is isothermal, adiabatic, or isobaric, even though the initial and final states are identical.

What is the PMM1?

2 marks

Answer

Explain the working of constant volume gas thermometer.

3 marks

Answer

What is the concept of entropy?

2 marks

Answer

Which law of thermodynamics violated by PMM2? And Why?

3 marks

Answer

What do you meant by actual Air standard cycle?

2 marks

Answer

Draw P-v and T-s diagrams for Dual combustion cycle.

3 marks

Answer

Write down the importance of fuel injector.

2 marks

Answer

Classify the types of boilers.

3 marks

Answer

Part B

210 marks

What is quasi-static process? Explain its characteristic features?

5 marks

Answer

Explain about different types of systems with suitable examples.

5 marks

Answer

310 marks

Explain the concept of Continuum with neat sketch? Why is it so important in thermodynamic system?

5 marks

Answer

A fluid is contained in a cylinder piston arrangement that has a paddle that imparts work to the fluid. The atmospheric pressure is 760 mm of Hg. The paddle makes 10,000 revolutions during which the piston moves out 0.8m. The fluid exerts a torque of 1.275 N-m one the paddle. What is net work transfer, if the diameter of the piston is 0.6m?

5 marks

Answer

410 marks

State and explain the zeroth law of thermodynamics with neat sketch.

5 marks

Answer

Derive expression for steady flow energy equation.

5 marks

Answer

510 marks

Define the first law of thermodynamics with neat sketch? And explain it’s limitations.

5 marks

Answer

4 kg of fluid contained in a cylinder receives 100kcal of work by paddle wheel together with 70kJ in the form of heat. At the same time, the piston in the cylinder moves in such a way that pressure remains constant at 150kN/m2 and fluid expand from 2m3 to 4m3. Estimate the change in internal energy and change in enthalpy?

5 marks

Answer

610 marks

Show that Kelvin Planck statement and Clausius statement of second law thermodynamics are equivalent.

5 marks

Answer

Define an adiabatic process. Show that a reversible adiabatic process for a given mass of perfect gas is Pv^k = Constant.

5 marks

Answer

710 marks

How is the entropy change of a reversible process estimated? Will it be different for an irreversible process between the same end states?

5 marks

Answer

A rigid tank of 0.2m3 capacity contains nitrogen at 400kPa and 25C. The tank is exposed to a constant temperature source at 160C, which result in 50kJ of heat being transferred to nitrogen. Determine i) Final state of gas. ii) Change in internal energy. iii) Change in entropy. Take Cv = 743J/kg.K for Nitrogen.

5 marks

Answer

810 marks

An air standard Otto cycle operates with a compression ratio 8. At the beginning of the compression the air is at 1.01 bar and 35C, and during the heat addition process the pressure is doubled. Calculate the thermal efficiency of the cycle.

5 marks

Answer

Write about Dual combustion cycles with neat sketch and the significance of the same?

5 marks

Answer

910 marks

Derive an expression for thermal efficiency of Otto cycle.

5 marks

Answer

Draw P-v and T-s diagrams for Otto cycle.

5 marks

Answer

1010 marks

What is the internal combustion engine, write detailed classification.

5 marks

Answer

Write down the importance of cooling and lubrication systems in internal combustion engines.

5 marks

Answer

1110 marks

Explain the different types of engine arrangement systems.

5 marks

Answer

Write down the differences between two and four stroke engines.

5 marks

JNTU B.Tech II THERMAL SCIENCE Previous Question Paper (September/October - 2023 - R18)

Part A

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Part B

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