B.TECH - Semester 3 fluid mechanics and machines Question Paper 2020 (feb)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- How do you differentiate between the Laminar and Turbulent flow through a pipe?
- Explain the working of a piezometer.
- What do you mean by water hammer? What is its reason for water hammer?
- What are the different head losses occurring in a pipe flow?
- What is Specific speed of a turbine? Derive an expression for the Specific speed of a turbine?
- Sketch the inlet and exit velocity triangles for a reaction turbine. Explain each term.
- What is slip? How a negative slip is generated in reciprocating pumps?
- Explain the working of a hydraulic ram.
- State and explain the Buckingham's Pi theorem
- What are shape numbers? ( $10 \times 4=40$ Marks) PART - B
- (a) Derive Bernoulli's equation. What are the assumptions made in the formulation of the Bernoulli's equation?
- (b) An oil of specific gravity 0.8 is flowing through a venturi meter with an inlet diameter of 20 mm and throat diameter 10 mm . The oil-mercury differential manometer shows a reading of 250 cm . Calculate the discharge of oil through the horizontal...
- (a) What is equivalent pipe? Derive an expression for the diameter of the equivalent pipe for a pipe flow with different diameter pipes.
- (b) The difference in water surface levels in two tanks, which are connected by three pipes is series of lengths $300 \mathrm{~m}, 170 \mathrm{~m}$ and 210 m with diameters 300 $\mathrm{mm}, 200 \mathrm{~mm}$ and 400 mm respectively, is 12 m . Determ...
- (a) Explain the working of a Francis Turbine. Derive an expression for the drafttube used with the turbine.
- (b) Two jets strike the buckets of a Pelton wheel, having shaft power 15 MW . The net head on the turbine is 400 m and the diameter of each jet is 200 mm . Find the power input to the turbine and overall efficiency.
- (a) Explain the working of a Kaplan Turbine using suitable sketches.
- (b) A Kaplan Turbine is to develop 7.5 MW shaft power. The net head available is 5.50 m and the diameter of the boss is one third of the runner. The speed ratio is 2.1 and the flow ratio is 0.68 with an overall efficiency of $60 \%$. Find the diamete...
- (a) Derive an expression for the use of air vessels in the suction and delivery side of the reciprocating pump. Hence, mark it in the indicator diagram. 10
- (b) A double acting reciprocating pump, running at 50 rpm , delivers $0.02 \mathrm{~m} 3 / \mathrm{sec}$ of water. The diameter of the piston is 200 mm and stroke length 400 mm , Determine, the theoretical discharge of the pump, the coefficient of di...
- (a) Explain the working of a double end suction centrifugal pump using suitable diagrams. Also derive an equation for the work done by the impeller on water.
- (b) Explain the working of a jet pump using suitable diagrams. What are the advantages of submersible pumps over jet pumps? ( $\mathbf{3} \boldsymbol{\times} \mathbf{2 0} \boldsymbol{=} \mathbf{6 0}$ Marks)