Download AKTU B-Tech 7th Sem 2018-2019 NEN 701 Electric Drives Question Paper

Code: 20A3301

III B. Tech I Semester (R20) Regular Examinations November 2022

FLUID MECHANICS AND HYDRAULIC MACHINERY

(Mechanical Engineering)

Time: 3 hours                                                                                                                          Max. Marks: 70

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Note: 1. Question paper consists: Part-A and Part-B.

          2. Answer all questions in Part-A and answer any five questions from Part-B

PART – A                                                                                                                                                            (10*2 Marks = 20 Marks)

1. Define the terms: Specific weight, specific volume, specific gravity, and viscosity.
2. What is the hydrostatic law?
3. Define stream function and velocity potential function.

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4. What is Euler’s equation of motion?
5. Define hydraulic gradient line and total energy line.
6. What are the minor losses in pipe flow?
7. Define the terms: hydraulic efficiency and mechanical efficiency.
8. What is specific speed of a turbine?

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9. What is priming of a centrifugal pump?
10. Define slip and percentage slip of a reciprocating pump.

PART – B                                                                                                                                                            (5*10 Marks = 50 Marks)

1. 2. a) A plate of area 1x10⁶ mm² is moving over a large stationary plate on a layer of oil of thickness 3mm. For the oil µ=30 poise. Determine the force required to move the plate at a speed of 0.4 m/s.

   b) A simple U-tube manometer containing mercury is 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 the atmosphere. Find the vacuum pressure in pipe, if the difference of mercury level in the two limbs is 40 cm and the height of fluid in the left limb from the centre of pipe is 15 cm below.

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2. 3. a) The stream function is given by ? = 5x - 6y, calculate the velocity components and also magnitude and direction of the resultant velocity at any point.

   b) Derive the Bernoulli’s equation from Euler’s equation.

3. 4. a) Derive the expression for the loss of head due to sudden enlargement.

   b) A horizontal pipe line 40 m long is connected to a water tank at one end and discharges freely into the atmosphere at the other end. For the first 25 m of its length from the tank, the pipe is 150 mm diameter and then the diameter is suddenly enlarged to 300 mm. The height of the water level in the tank is 8 m above the centre of the pipe. Considering all losses of head, determine the rate of flow. Take f = 0.01 for both sections of the pipe.

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4. 5. A jet of water having a velocity of 40 m/s strikes a curved vane, which is moving with a velocity of 20 m/s. The jet makes an angle of 30° with the direction of motion of vane at inlet and leaves at an angle of 90° to the direction of motion of the vane at outlet. Draw the velocity triangles at inlet and outlet and determine the vane angles, so that the water enters and leaves without shock. Also, determine the work done per second per unit weight of water striking the vane.

5. 6. What is a draft tube? Describe with neat sketches the different types of draft tubes.

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6. 7. A centrifugal pump is to deliver 0.04 m³/s at a speed of 1450 r.p.m. against a head of 25m. The impeller diameter is 220 mm, its width at outlet is 24 mm and manometric efficiency is 75%. Determine the vane angle at the outer periphery of the impeller.

7. 8. Explain the working principle of reciprocating pump with neat sketch.

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