B.TECH - Semester 4 fluid machinery Question Paper 2019 (jun)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- 405 : FLUID MACHINERY (M) (2013 Scheme) Time : 3 Hours Time : 3 Hours Max. Marks : 100 Answer all questions in Part A and One full question from each module in Part B
- Define the term impact of jets.
- Differentiate between radial and axial flow turbines.
- Draw inlet and outlet velocity triangles for a pelton wheel.
- Define specific speed of a centrifugal pump.
- Haw the model testing of the centrifugal pumps is carried out?
- Why the speed of a reciprocating pump without air vessels is not high?
- What is a difference between fluid coupling and fluid torque converter?
- Define hydraulic accumulators.
- What is surging?
- What is the effect of atmospheric conditions on the output of a compressor? ( $\mathbf{1 0} \boldsymbol{\times} \mathbf{2} \boldsymbol{=} \mathbf{2 0}$ Marks) P.T.O.
- (a) Describe briefly the function of various main components of pelton turbine with a neat sketch.
- (b) A Francis turbine with an overall efficiency of $75 \%$ is required to produce 148.25 kW power. It is working under a head of 7.62 m . The peripheral velocity $=0.26 \sqrt{2 g H}$ and the radial velocity of flow at inlet is $0.96 \sqrt{2 g H}$. T...
- (i) The guide blade angle, (ii) The wheel vane angle at inlet, (iii) Diameter of the wheel at inlet, and (iv) Width of the wheel at inlet.
- (a) What is a draft tube? What are its different types? Explain the theory of draft tube.
- (b) A conical draft tube having inlet and outlet diameters 1 m and 1.5 m discharges water at outlet with a velocity of $2.5 \mathrm{~m} / \mathrm{s}$. The total length of the draft tube is 6 m and 1.20 m of the length of draft tube is immersed in wat...
- (i) Pressure head at inlet, and (ii) Efficiency of the draft tube
- (a) With a neat sketch explain the characteristic curves of centrifugal pumps.
- (b) A single-stage centrifugal pump with impeller diameter of 300 mm rotates at 2000 r.p.m. and lifts $3 \mathrm{~m}^{3}$ of water per second to a height of 30 m with an efficiency of $75 \%$. Find the number of stages and diameter of each impeller o...
- (a) Prove that the manometric head of a centrifugal pump running at speed N and giving a discharge Q may be written as: $\mathrm{H}_{\text {mano }}=\mathrm{AN}{ }^{2}+\mathrm{BNQ}+\mathrm{CQ}^{2}$, where $A, B$ and $C$ are constants.
- (b) The diameters of an impeller of a centrifugal pump at inlet and outlet are 300 mm and 600 mm respectively. The velocity of flow at outlet is $2.0 \mathrm{~m} / \mathrm{s}$ and the vanes are set back at an angle of $45^{\circ}$ at the outlet. Dete...
- (a) Derive an expression for the head lost due to friction in the delivery pipe of a reciprocating pump with and without an air vessel. (b), The cylinder bore diameter of a single acting reciprocating pump is 150 mm and its stroke is 300 mm . The pum...
- (a) Describe with neat sketch hydraulic accumulator and differential hydraulic accumulator.
- (b) The water is supplied at the rate of 3000 litres per minute from a height of 4 m to a hydraulic ram, which raises 300 litres/minute to a height of 30 m from the ram. The length and diameter of the delivery pipe is 100 m and 70 mm respectively. Ca...
- (a) With p -v diagram explain the multistage reciprocating compressor with intercooler and state its advantage and disadvantage.
- (b) A single-stage double-acting compressor has a free air delivery (F.A.D.) of $14 \mathrm{~m}^{3} / \mathrm{min}$ measured at 1.013 bar and $15^{\circ} \mathrm{C}$. The pressure and temperature in the cylinder during induction are 0.95 bar and $32^...
- (i) Indicated power required and (ii) Volumetric efficiency OR
- (a) Describe with a neat sketch, the construction and working of an axial flow compressor.
- (b) The following data pertains to a centrifugal compressor: Total pressure ratio = 3.6:1 Diameter of inlet eye of compressor impeller $=350 \mathrm{~mm}$ Axial velocity at inlet $\quad=140 \mathrm{~m} / \mathrm{s}$ Mass flow $=12 \mathrm{Kg} / \mat...
- (i) The static pressure ratio. (ii) The static pressure and temperature at inlet and outlet of compressor. (iii) Work of compressor per Kg of air. (iv) The theoretical power require ( $\mathbf{4} \boldsymbol{\times} \mathbf{2 0} \boldsymbol{=} \math...