Visvesvaraya Technological University (VTU) 2007 B.E THERMODYNAMICS AND FLUID MECHANICS - Question Paper

1. (a) discuss briefly the classifications of thermodynamic systems with suitable diagrams.
(5 marks)
(b) describe the subsequent with an example.
i) Property ii) State
iii) Process (9 marks)

(c) discuss why reversible process is not possible. Draw a line diagram of a reversible engine.
(6 marks)

2. (a) Derive an expression for work done at moving boundary. Enumerate the applications of
governing formula for work done at moving boundary. (10 marks)

(b) Compare work and heat. (5 marks)

(c) State the II legal regulations of thermodynamics. Draw the schematic representation with the help of a
heat source and sink. (5 marks)


3. (a) Draw the PV and TS diagrams for a double stage compressor. (4 marks)
(b) Derive an expression for work done of a single stage air compressor with clearance
quantity. (8 marks)

0
(c) The initial pressure and temperature of a single stage air compressor is 1.03 b and 25 C.
0
It delivers the air at 8.1 b and 39 C. If the pressure loss at inlet and outlet are 0.08 b and
0.14 b respectively, determine the volumetric efficiency. presume the clearance quantity to
be 2% and the governing legal regulations for compression and expansion are PV = C. (8 marks)

4. (a) describe ideal and real fluids. List the parameters, which distinguish them.
(5 marks)
(b) describe any 5 of the subsequent. Mention their SI units.

i) Specific Density ii) Surface Tension iii) Specific quantity
iv) Viscosity v) Capillarity. vi) Compressibility (15 marks)



Part-B

5. (a) A water pipe line of 0.5 m diameter is supplied with drinking water at a velocity of 1.5
m/sec. If the pressure inside the pipe is measured to be 2.74 b and the pipe is kept at a height
of seven m compute the total head of the flowing water. (10 marks)
(b) With neat sketch, discuss the construction and principle of a double column U tube
manometer. Write the merits and demerits of this over U tube manometer. (10 marks)

6. (a) State and derive Bernoulli’s equation, mentioning necessary assumptions.
(10 marks)

(b) Draw the schematic representation of hydraulic gradient and total energy lines. (10 marks)

3
7. (a)Discharge of water through a 0.034 m pipe is measured to be 0.013 m / sec. If the length
of the pipe is 15 m and the coefficient of friction is 0.0041 compute the head loss due to
friction in meters. (6 marks)

(c) define briefly the discharge measurement in a triangular notch. (6 marks)
(b) With a neat sketch, discuss the principle of orifice meter
(8 marks)


8. (a) With neat sketch, discuss the principle of a double acting reciprocating pump. (10 marks)

(b) With neat sketch, discuss the working principle of centrifugal pump. With a property diagram,
discuss how the pressure drop is induced in this pump. (10 marks)

Earning:   Approval pending.