Saturday 7 April 2018

FLUID MECHANICS AND FLUID POWER : Board Exam Questions for Diploma

321
October 2017
Time — Three hours
(Maximum Marks: 75)
(N.B: (1) Q.No. 8 in PART - A and Q.No. 16 in PART - B are compulsory. Answer any
FOUR questions from the remaining in each PART - A and PART - B.
(2) Answer division (a) or division (b) of each question in PART-C.
(3) Each question carries 2 marks in PART — A, 3 marks in Part — B and 10 marks in PART - C.)
PART-A
1. What is meant by pressure head? (October 2017)
2. Define compressibility. (October 2017)
3. What is turbulent flow? (October 2017)
4. Write down the formula to find the theoretical discharge of a double acting reciprocating pump. (October 2017)
5. What are the different types of impellers used in centrifugal pumps? (October 2017)
6. Draw the ISO symbol of FRL unit. (October 2017)
7. What is 3/2 DCV? (October 2017)
8. State any two demerits of hydraulic systems. (October 2017)
PART-B
9. Explain the method of measuring local atmospheric pressure. (October 2017)
10. What is continuity equation? Explain. (October 2017)
11. State Bernoulli’s theorem and write its few applications. (October 2017)
12. Write the expression for the work done by the jet on a series of moving plates on the circumference of a revolving wheel. (October 2017)
13. State the difference between Kaplan turbine and Francis turbine. (October 2017)
14. What is FRL unit? Explain briefly. (October 2017)
15. Explain the working of a pressure regulator. (October 2017)
16. List out the elements of hydraulic system with a line diagram. (October 2017)

PART-C
17. (a) (i) A gauge fitted to a compressor shows a reading of 3OkN/m2. Compare the corresponding absolute pressure in (a)kN/m2 and (b) “m” of water. (October 2017)
(ii) Explain the working of hydraulic jack with a neat sketch. (October 2017)
(Or)
(b) (I) What are the precautions to be followed in setting up and
operation of manometer? (October 2017)
(ii) Explain the working of Bourdon tube pressure gauge with a simple sketch. (October 2017)
18. (a) (i) What are the hydraulic co-efficients? Explain briefly. (October 2017)
(ii) Using Chezy’s formula, determine the head lost due to friction in a pipe of 80mm diameter and 35m length. The velocity of flow is 2 m/s and C=100. (October 2017)
(Or)
(b) (i) Compare Venturimeter and Orificemeter. (October 2017)
(ii) Two reservoirs are connected by a pipe line of length 500m. The difference in level between the reservoirs is l0 m. If the maximum discharge is 0.2m3/s, calculate the required size of the pipe. Assume f=0.005. (October 2017)
19. (a) A jet of water 80 mm diameter moves with a velocity of 15 m/s and strikes a series of vanes moving with a velocity of l0 m/s. Find (a) the force exerted by the jet, (b) work done by the jet per second and (c) efficiency of the jet. (October 2017)
(Or)
(b) Explain the governing of Pelton wheel with a neat sketch. (October 2017)
20. (a) (i) Explain the use of shuttle valve in pneumatic circuits. (October 2017)
(ii) List out the merits of pneumatic system. (October 2017)
(Or)
(b) (i) Explain the working of 5/2 DCV with a neat sketch. (October 2017)
(ii) Draw the circuit diagram for the direct control of single acting cylinder and explain. (October 2017)
21. (a) (i) Explain the spring loaded type accumulator. (October 2017)
(ii) Explain radial piston pump with sketch. (October 2017)
(Or)
(b) (i) Explain the various essential qualities of a good hydraulic fluid. (October 2017)
(ii) Explain the hydraulic circuit used for the table movement of a surface grinding machine. (October 2017)
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April 2017
PART-A
1. Define viscosity of a fluid.
2. State Pascal’s law.
3. What is an orifice?
4. Define co-efficient of contraction.
5. What is a draft tube?
6. Draw the ISO symbol of 5/3 DCV.
7. What is the use of accumulator?
8. Define negative slip. In which type of pumps it will occur?
PART—B
9. Distinguish between cohesion and adhesion.
10. Define wetted perimeter and hydraulic radius.
11. Differentiate impulse and reaction turbines.
12. Describe about indicator diagram.
13. List out the elements of pneumatic system with a line diagram.
14. What is the purpose of quick exhaust valves used in pneumatics system?
15. State any three advantages of hydraulic system.
16. What are the objectives of adding additives to hydraulic oil?
PART-C
17. (a) (i) Explain the terms atmospheric pressure, gauge pressure and vacuum pressure.
(ii) Explain the working of hydraulic press with neat sketch.
(Or)
(b) (I) Explain the working of dead weight pressure gauge with a simple sketch.
(ii) An inverted U-tube differential manometer is connected to measure the difference of pressure between two points of horizontal pipe line carrying water. The gauging liquid is an oil of specific gravity 0.8. Find the difference of pressures, if the manometer reading is 0.4 m.
18. (a) (i) Derive Chezy’s formula for the loss of head due to friction in pipes.
(ii) Compare the velocities of flow of water in two pipes of diameter 160mm and 220mm respectively, when the loss of head due to friction, length of pipe and the value of ‘f’ are same for each pipe.
(Or)
(b) (i) State the laws of fluid friction in laminar flow.
(ii) State the advantages and Limitations of Bernoulli’s theorem.
19. (a) (i) Explain the working of impulse turbine with a neat sketch.
(ii) Compare piston and plunger pumps.
(Or)
(b) (I) Explain any one type of casing employed in centrifugal pumps.
(ii) State the advantages of air vessels used in reciprocating pumps.
20. (a) (i) Explain the working of a 5/2 DCV in pneumatics.
(ii) Draw the circuit diagram for the operation of a double acting cylinder with metering-in control.
(Or)
(b) Explain the automatic operation of double acting cylinder with a circuit.
21. (a) (i) Explain the working of internal gear pump with a simple sketch.
(ii) Explain the working of any one type of accumulator with sketch.
(Or)
(b) (i) Explain the table movement of milling machine with a hydraulic circuit.
(ii) Compare pneumatic and hydraulic systems.
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704
October 2016
Time — Three hours
(Maximum Marks: 75)
(N.B: (1) Answer any fifteen questions in PART — A and division (A) or division (B) of each question in PART - B.
(2) Each question carries 1 (one) mark in PART — A and 12 (twelve) marks in PART - B.)
PART-A
1. Define absolute pressure.
2. Define Pascal’s law.
3. What is pressure head?
4. What is the use of micro manometer?
5. What is laminar flow?
6. State any two assumptions are considered in deriving Bernoulli’s theorem.
7. What is wetted perimeter?
8. What are the types of venturimeter?
9. Differentiate Francis and Kaplan turbines.
10. What is the purpose of draft tube?
11. Why do you need to priming?
12. Define slip.
13. Draw the ISO symbol for FRL unit.
14. What is the use of quick exhaust valve?
15. What is meant by 5/3 DCV?
16. Write any two demerits of pneumatic system.
17. What is Lubricity of fluid?
18. What is pressure intensifier?
19. Draw the ISO symbol of 4/2 DCV.
20. Mention any two service properties of hydraulic fluid.
PART-B
21. (A) (I) Explain about diaphragm pressure gauge.
(ii) Explain about hydraulic press with neat sketch.

(Or)
(B) (i) Explain about gauge pressure, vacuum pressure, atmosphere pressure and absolute pressure.
(ii) A pipe contains an oil of specific gravity 0.8. A differential manometer connected at the two points A and B of the pipe  shows a difference in mercury level as 20 cm. Find the difference of pressure at the two points.
22. (A) Derive an expression for the discharge through venturimeter.
(Or)
(B) (I) Using Chezy’s formula, find the loss of head due to friction in a circular pipe 40m long and 100mm diameter when the velocity of flow is 2.4 m/sec. Take C=100.
(ii) Explain any four minor losses occurred in flow through pipes.
23. (A) (i) A jet of water 65mm diameter moves with a velocity of 12m/s and strikes a series of vanes moving with a velocity of 9m/s. Find (a)co-efficient of jet (b)force exerted by the jet (c)work done by the jet.
(ii) Explain the working of submersible pump with neat sketch.
(Or)
(B) (I) Explain the working principle of reciprocating pump with neat sketch.
(ii) A double acting reciprocating pump having a piston area 0.2 m2 has a stroke of 0.4 m. The pump is discharging 50 lps water at 50 rpm through a total height of  l0 m. Find (i)the slip of the piston (ii)power required to drive the pump.
24. (A) (i) Explain about the uses of quick exhaust valves in pneumatic systems with neat sketches.
(ii) Explain about FRL unit with neat sketch.
(Or)
(B) (i) Explain the operation of double acting cylinder with metering in control with neat sketch.
(ii) List out the applications of pneumatic system.
25. (A) (i) Explain about gas filled accumulator with neat sketches.
(ii) Explain about radial piston pump with neat sketch.
(Or)
(B) (i)  Explain about hydraulic circuit for table movement in surface grinding machine.
ii Draw a spring loaded type accumulator and mark the parts
*******************************************************


628
April 2016
Time - Three hours
(Maximum Marks: 75)
(N.B: (1) Answer any fifteen questions in PART — A and division (A) or division (B) of each question in PART - B.
(2) Each question carries 1 (one) mark in PART - A and 12 (twelve) marks in PART - B.I
PART—A
1. Define ideal fLuid.
2. What is pressure head of a fluid?
3. Define Pascal’s law.
4. What is the use of dead weight pressure gouge?
5. What is turbulent flow?
6. Mention any two energy losses not considered in Bernoulli’s theorem.
7. Define Bernoulli’s theorem.
8. What is wetted perimeter?
9. Differentiate impulse and reaction turbines.
10. What is the function of surge tank?
11. What is cavitation?
12. What is negative slip?
13. What is FRL unit?
14. What is the function of a relief valve?
15. Draw the ISO symbol of 3/2 DCV.
16. Mention any two applications of pneumatic system.
17. What is lubricity of a fluid?
18. What is accumulator?
19. When the pressure intensifiers to be used in hydrciuLics system?
20. Mention any two applications of hydraulic system.
PART — B
21. (A) (i) Define (a) Specific gravity (b) cohesion.
(ii) Explain hydraulic lift with neat sketch.
(Or)
(B) (i) An U-tube differential manometer connects two pipes A and
B. The pipe A contains on oiL of specific gravity 1.59 under a pressure of l00 kN/m2, The pipe B contains water under a pressure of 80 kN/m2, The pipe A lies 2 m above the pipe B. The centre of the pipe B is 0.5 m above the mercury level in the limb which connects pipe A. Find the difference in levels of the mercury.
(ii) Explain the operation of diaphragm type pressure gauge with sketch.
22. (A) (i) What are the assumptions made in Bernoulli’s theorem?
(ii)  Water is supplied to a factory from a hydro power station by means of a pipe Line of 200mm diameter and 12 km long. The pressure at the power station is 45000 kN/m2. Find the maximum power that can be transmitted to the factory. Assume F=0.028.
(Or)
(B) (i) The difference of heads between the two ends of a pipe 400 m long and 480 mm diameter is 1.5 m. Taking Darcy’s coefficient as 0.04, calculate the discharge through the pipe. Neglect minor losses.
(ii) Explain any two minor losses occurred in fluid flow.
23. (A) (i) A jet of water 80mm diameter moves with a velocity of 15 m/s and strikes a series of vanes moving with ci velocity of l0 m/sec. Find (a) The force exerted by the jet (b) Work done by the jet and (c) Co-efficient of jet.
(ii) Explain the working of a jet pump with neat sketch.
(Or)
(B) (I) Explain the working of multi-stage centrifugal pumps with neat sketches.
(ii) The piston of a single acting pump has a diameter of 100 mm and a stroke of 200 mm. The pump raises the water  to a height of 20 m at 50 rpm. Calculate the theoretical discharge and power required if the efficiency is 90%.
24. (A) (i) Explain the working of 5/3 DCV with neat sketch.
(ii) Explain the uses of shuttle valve in pneumatic system with neat sketch.
(Or)
(B) (i) Explain the merits and demerits of pneumatic systems.
(ii) Explain the automatic operation of double acting cylinder with neat sketch.
25. (A) (I) Explain any one type of accumulator with neat sketch.
(ii) Explain the working of vane pump with neat sketch.
(Or)
(B) (i) Explain the hydraulic circuit for milling machine tabLe movement with neat sketch.
(ii) Compare hydraulic and pneumatic systems.

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