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Posted By: kondapalli Member Level: Gold Posted Date: 06 Jun 2008
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2007 Jawaharlal Nehru Technological University B.Tech Production THERMODYNAMICS & FLUID MECHANICS setno4 Question paper
1. (a) Explain the terms state, path, process and cyclic process. [4x2=8]
(b) Discuss the macroscopic and microscopic point of view of thermodynamics.
[8]
2. A cylinder fitted with a piston has an initial volume of 0.1m3and contains nitrogen
at 150kpa, 250C. The piston is moved to compress the nitrogen until the pressure
is 1 Mpa and the temperature is 1500C. The work done on the nitrogen is 20kJ.
Determine the amount of heat transfer from the nitrogen. [16]
3. (a) State and explain any four factors which render processes irreversible. [8]
(b) A reversible heat engine receives heat from a reservoir at 700 0C and rejects
heat to another reservoir at temperature T2. A second heat engine receives the
heat rejected by the first engine and rejects heat to a sink at 37 0C. Calculate
temperature T2 for [8]
i. equal efficiency for both engines
ii. equal work for both engines
4. (a) Show that available energy decreases during heat transfer through finite tem-
perature difference. [8]
(b) A mass of 6.98 kg of air is in a vessel at 200 kPa and 270C . Heat is transferred
to the air from a reservoir at 7270C until the temperature of the air rises to
3270C. The environment is at 100kPa, 170C . Determine [8]
i. The initial and final availability of air and
ii. the maximum useful work associated with the process.
Assume for air Cp= 1.005 kJ/kg.K and R = 0.287kJ/kg.K.
5. The compression ratio of Diesel cycle is 16, the temperature and pressure at the
beginning of the compression are 150C and 0.1Mpa respectively. Heat is added until
the temperature at the end of the constant pressure process is 14800C. Calculate
[16]
(a) the cut off ratio,
(b) heat supplied per kg of air,
(c) the cycle efficiency and
(d) mean effective pressure.
6. (a) Define fluid surface tension property . What are its examples? [6]
(b) The velocity distribution in a viscous flow over a plate is given by u = 4y - y2
where u is velocity at distance y from the plate. If the coefficient of dynamic
viscosity is 1.5 Pa.sec, determine the shear stress at y=0 and at y=2. [10]
7. (a) When do you say the flow is rotational or irrotational ? Give suitable exam-
ples? [8]
(b) A stream function is given by ?= x3 - y3. Show that the flow can not be a
potential flow. [8]
8. (a) Write Bernoulli’s equation in the from of energy per unit mass, energy per unit
weight and energy per unit volume. Indicate the meaning of each term of the
equation and discuss its limitations. Mention some applications of Bernoulli’s
theorem. [8]
(b) A pipe through which water is flowing is having diameters 40cm and 20cm at
the cross sections 1 and 2 respectively. The velocity of water at section 1 is
given 5.0m/sec. Find the velocity head at the sections 1 and 2 and also the
discharge. [8]
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