Winter 2013 Fluid Mechanics and Hydralic Machines Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
Diploma Engineering - SEMESTER–III • EXAMINATION – WINTER 2013
Subject Code: 3331903 Date: 02-12-2013
Subject Name: Fluid Mechanics and Hydraulic Machines
Time: 02:30 pm - 05:00 pm Total Marks: 70

Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. English version is considered to be Authentic.

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Q.1 (a) Define following terms with its S.I. unit: 1.Specific Gravity 2. Surface
Tension 3. Dynamic Viscosity 4. Kinematic Viscosity 5. Density 07

(b) Prove Pascal’s law for Static fluid. 05

(c) Define Manometer. Classify it. 02

Q.2 (a) Differentiate the following: 1. Laminar & Turbulent flow.
2. Steady & Unsteady flow 3. Uniform & Non uniform flow 07

(b) An oil of specific gravity 0.8 is flowing through a venturimeter having inlet
diameter 20 cm and throat diameter 10 cm. The oil mercury differential
manometer shows a reading of 25 cm. Calculate the discharge of oil through
the horizontal venturimeter. Take co-efficient of discharge 0.98 07

OR

(b) A simple U-tube manometer containing mercury connected to a pipe in
which a fluid of specific gravity 0.8 and having vacuum pressure is flowing.
The other end of the manometer is open to atmosphere. Find the vacuum
pressure in pipe if the difference of mercury level in the two limb is 40 cm
and the height of the fluid in the left from the center of pipe is 15 cm below. 07

Q.3 (a) Classify flow measuring instruments. Derive expression for discharge
through orifice. 07

(b) The head of water over a rectangular notch is 90 cm. The discharge is 300
lit/sec. Find the length of the when co-efficient of discharge is 0.62 07

OR

Q.3 (a) Explain 1. Water hammer effect 2. Surge tank 3. Moody’s chart 07

(b) A right angled V-notch is used for measuring a discharge of 30 lit/sec of a
water. Find head of a water. Take co-efficient of discharge 0.62 07

Q.4 (a) Write Construction, working and advantages of Hydraulic Intensifier with
neat sketch. 07

(b) Writer short note on following : 1. Air Vessel 2. Draft Tube 3. Priming 07

OR

Q. 4 (a) Write construction and working of Pelton wheel with neat sketch. 07

(b) Write Description & Principles of different elements of pneumatic system. 07

Q.5 (a) Write Construction & working of single acting reciprocation pump with
meat sketch. 07

(b) Write relation between Absolute, Gauge and Vacuum pressure. 05

(c) Draw a neat sketch of Burdon Tube Pressure Gauge. 02

OR

Q.5 (a) Write short note on following: Air Motor 2. Hydraulic motors 07

(b) Define fluid. Classify it. 05

(c) Differentiate - Adhesion & Cohesion 02

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