GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
BE - SEMESTER-V (NEW) EXAMINATION — WINTER 2018
Subject Code:2153612
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Subject Name:Basics of Fluid Flow
Time: 10:30 AM TO 01:00 PM
Date:11/12/2018
Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 (a) | Mention Newton’s law of viscosity. Give the classification of fluids based on Newton’s law of viscosity. | MARKS | 03 |
| (b) | Describe any four properties of fluids with their units. | 04 | |
| (c) | The surface area of a moving plate is 2 m² which is moving at a velocity of 0.6 m/s. the distance between fixed plate and moving plate is 0.2 mm. Viscosity of fluid is 0.1 Ns/m². Determine the shear stress, and power required to maintain velocity of plate. | 07 | |
| Q.2 (a) | Why water is not used as a manometric fluid in Manometers? | 03 | |
| (b) | Write a short note on various pressure measurement scales? | 04 | |
| (c) | Find the depth of oil of specific gravity of 0.82 which produces an intensity of pressure equal to 2.5kN/m². Also find the pressure head in terms of water and mercury. | 07 | |
| OR | |||
| (a) | Discuss how a U-tube differential manometer can be used to measure pressure difference in a pipe. | 07 | |
| (b) | Explain (i) Laminar flow (ii) Turbulent flow (iii) Unsteady flow | 03 | |
| (c) | Briefly discuss formation of boundary layer in tubes mentioning transition length. | 04 | |
| Q.3 (a) | Water is flowing through a pipe of 7 mm diameter under a pressure of 50 kPa and with a velocity of 3 m/sec. neglecting friction find the total head if the pipe is 10 m above the datum line. | 07 | |
| OR | |||
| (b) | Differentiate streamline and streamtube. | 03 | |
| (c) | Water is flowing through a pipe of inside diameter 50mm with a volumetric flow rate of 0.00063m³/sec. Calculate mass flow rate and mass velocity of water. | 04 | |
| Q.4 (a) | Mention the various representational forms of Bernoulli’s equation interpreting the physical significance of each of them. | 07 | |
| (b) | Discuss static dynamic and total head with respect to pitot tube | 03 | |
| (c) | Derive the equation of discharge of flow through venturimeter. | 04 | |
| Q.4 (a) | A fluid of density 900 kg/m³ and viscosity 0.005 Ns/m² is flowing through a pipe of 0.4m diameter and 900 m long. If the volumetric flow rate of fluid is 0.33m³/s. Determine the head lost due to friction and power required to pump the fluid | 07 | |
| OR | |||
| (b) | Mention the various heads in a pump. | 03 | |
| (c) | Describe various hydraulic coefficients of orifice. Mention relationship between them. | 04 | |
| Q.5 (a) | Determine the head lost due to friction for the flow of water through a pipe of 30 cm diameter and 60m long. The volumetric flow rate of water is 0.15m³/sec? | 07 | |
| (b) | A Flat blade turbine with six blades is installed centrally in a tank. The tank is 1.83 m in diameter with turbine 0.61m and positioned 0.61m from the bottom of the tank. The turbine blades are 127mm wide. The tank is filled up to a depth of 1.83 m with a solution of 50% caustic soda at 65.6 °C having a viscosity of 12 cp having a density of 1498 kg/m³. The turbine is operated at 90 rpm. The tank is baffled. Estimate Reynolds number and power requirement to operate the mixer? (Take value of Power number = 6 for calculations | 07 | |
| (c) | Describe the various kinds of agitation equipments used in process industries. | 03 | |
| OR | |||
| (a) | Explain the correlation between form drag and streamlining | 04 | |
| (b) | A sand particle having an average diameter of 1mm has a specific gravity of 2.1. Determine the terminal settling velocity and Reynolds number of the particle settling in water at a temperature of 20 °C. | 07 | |
| (c) | What is fluidization? Derive an expression for minimum fluidization velocity from first principles. | 07 | |
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