FLUID MECHANICS AND FLUID POWER : April 2019 and October 2019 Board Exam Questions for Diploma

April 2019

PART-A

1. Define specific weight of a fluid.

2. Define Pascal's law.

3. Define uniform flow of fluid.

4. Write any two differences of Francis and Kaplan turbines.

5. Differentiate plunger and piston pumps.

6. List out the important elements of pneumatic systems.

7. Define de-emulsibility.

8. Define hydraulic gradient line:

PART - B

9. Differentiate gauge pressure, vacuum pressure and absolute pressure.

10. Write short notes on hydraulic press

11. State any three assumptions made in Bernoulli's theorem.

12. Derive an expression for the force exerted and work  done by the jet on a series of moving plates.

13. Write short notes on FRL unit.

14. Compare hydraulic system with pneumatic system.

15. Explain the working of any type of accumulator.

16. Differentiate metering-in and metering-out circuits.

PART-C

17. (a) Explain with a sketch, the working principle of a Bourdon's tube pressure gauge. Mention its applications.

(Or)

 (b) (i) Explain the pressure measurement by inclined tube micro manometer.

(ii) The vacuum pressure in a pipe line carrying  water was measured by U-tube manometer. The difference of mercury between the limbs is 0.05m and the free surface of mercury in the open limb is 0.1m below the centre line of the pipe. Find the absolute pressure head in the pipe in terms of metre of water.

18. (a) A pipe line is carrying water at a point A the diameter is 600mm, the pressure is 70 kN/m² and the velocity is 2.4 m/sec. At another point B which is 2m higher then A in the same pipe, the diameter is 300mm and the pressure is 14 kN/m². Determine the direction of flow.

(Or)

 (b) (i) Derive the Chezy's formula for the loss of head due to friction in pipes.

(ii) A pipe of 1m diameter and 1 km long delivers  water to a town at the rate of 10 m/sec. Calculate the loss of head due to friction if f = 0.04.

19. (a). With a neat sketch, explain the working of Pelton wheel.

(Or)

(b) Explain the construction and working of  submersible pump with neat sketch.

20. (a) Draw a pneumatic circuit for the direct control of single acting cylinder and explain.

(Or)

(b) Draw the pneumatic circuit for the automatic  operation of double acting cylinder and explain.

21. (a) (i) Explain spring loaded accumulator with sketch.

(ii) Explain the working of pressure intensifier with . a neat sketch.

(Or)

(b) (i) Explain the operation of internal gear pump with neat sketch.

(ii). Explain the hydraulic circuit with ISO symbols  for the quick return motion of a shaper.
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October 2019

PART - A

1. Which fluid is called Newtonian fluid?

2. What are the advantages of micro manometer?

3. Define steady flow of fluid.

4. Define the term impact of jet.

5. What is priming?

6. What is the function of check valve?

7. What is throttle valve?

8. What is cracking pressure of valve?

PART - B

9. Name any four properties of a fluid and state their units.

10. State Bernoulli's theorem.

11. State the function of accumulator,

12. What are the surge tanks? Name the different types of surge tank.

13. What is an air-vessel?  What are its functions?

14 Explain the working of a shuttle valve with a neat sketch.

15. State any three merits and any three applications of pneumatic system.

16. Define C_c, C_d, and C_v

PART - C

17. (a) (i) Explain the working of a diaphragm pressure gauge with a neat sketch.

(ii) Explain the working of a hydraulic jack with a neat sketch.

(Or)

An U-tube differential manometer connects two pressure pipe A and B, the pipe A contains carbon tetra-chloride having a specific gravity of 1.640 under a pressure of 128 kN/m². The pipe B contains oil of specific gravity of 0.85 under a pressure of 270 kN/m². The pipe 'A' lies 3 meters above pipe 'B'. The centre of the pipe B is at the level of mercury in the limb which connects the pipe A. Find the difference in the levels of mercury.

18. (a) A venturimeter is connected to vertical pipe line carrying water. The inlet and throat diameters are 220 mm and 110 mm respectively. The differential manometer connected to the inlet and throat of venturimeter gives a reading of 260 mm. Determine the rate of discharge of water in litres per second. C_d=0.98.

(Or)

(b) Derive Darcy-Weisbach equation for the loss of head due to friction in pipes.

19. (a) (i) Explain the construction and working of Francis turbine.

(ii) Find the force exerted by a 50 mm diameter jet directed against a flat plate held normal to the direction of the jet, when the jet velocity is 40 m/s and the plate is stationary.

(Or)

(b) (i) Describe the working of a jet pump with a neat sketch.

(ii) State the different types of impellers used in centrifugal pumps. Explain any one in detail.

20. (a) (i) Explain FRL unit with a neat sketch.

(ii) Explain the needle valve with a neat sketch.

(Or)

(b) (i) Explain the use of quick exhaust valve with a pneumatic circuit.

(ii) Draw and explain the operation of a double acting cylinder with metering-in control.

21. (a) (i) Explain the working of vane pump with a neat sketch.

(ii) Explain gas filled bladder type accumulator with a neat sketch.

(Or)

(b) Draw and explain hydraulic circuit for milling machine.