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2003 Course Industrial Hydraulics & Pneumatics

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Total No. of Questions : 12] P1273 [Total No. of Pages : 6 [3864]-152 B.E. (Mech. S/W) INDUSTRIAL HYDRAULICS AND PNEUMATICS (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answers to the two sections should be written in separate books. Answer Q. 1 or Q. 2, Q. 3 or Q. 4, Q. 5 or Q. 6 from section-I and Q. 7 or Q. 8, Q. 9 or Q. 10, Q. 11 or Q. 12 from section-II. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of electronic pocket calculator is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) What are the different locations where filters are provided in hydraulic [6] systems. b) Compare hydrostatic and hydrodynamic power transmission. [5] c) Write in short on Fluid Power applications in material handling. [5] OR Q2) a) Draw a neat sketch and explain working of a Gear Pump. Draw typical characteristics of a Gear pump. [10] b) What are the different types of seals used in various hydraulic components? [6] Q3) a) What are the properties of fluids which need to be considered while used in hydraulic systems? [6] b) Explain in brief the areas of application of fluid power. [6] c) Why hydraulic power especially useful with heavy work? [4] OR Q4) a) Explain : i) ii) [10] Accumulator as an auxiliary power source. Accumulator as a hydraulic shock absorber. b) What are the advantages of fluid power system. [6] P.T.O. Q5) a) Explain the different centre positions in direction control valves. [6] b) What is meter in and meter out circuit. Draw and explain the advantages of these circuits. [8] c) What is the purpose of providing pressure switch in a hydraulic circuit?[4] OR Q6) a) Explain working with the help of a neat sketch of i) ii) [15] Pressure compensated flow control valve. Pressure reducing valve. b) What is positive displacement and non-positive displacement pumps?[3] SECTION - II Q7) a) Explain with proper diagrams, the various types of styles used for mounting of hydraulic cylinders. [4] b) Draw circuits to show the applications of : [No description required][6] i) Unloading valve. ii) Extension of double acting cylinder with regenerative circuit. iii) Meter out flow control during the both strokes of cylinder. c) A motor is to be selected for operating the winch shown in fig. The motor should be capable of lifting the mass of 500kg at a linear speed of 600 mm/s. [6] calculate : i) The displacement of motor for the available pressure of 160 bar. Assume hyd. efficiency 95% mech. efficiency 93%. ii) The flow rate in 1Pm. [3864]-152 2 OR Q8) a) The circuit shown is used for hydraulic pressure testing of work piece. Two cylinders-one for locking and other to provide oil at high pressure are operated in sequence study the circuit and explain the operations of extending and retraction during one cycle. [10] b) Why cushioning of cylinder is essential? Explain with proper sketches various methods used in cushioning of cylinders. [6] Q9) a) Compare the salient features of hydraulic and pneumatic modes of power transmission. Discuss the fields of application and factors that govern the selection of the either of two. [3] b) Draw a typical basic pneumatic circuit incorporating directional/flow control (meter out) valves in addition to all other essential components of the circuit. [3] [3864]-152 3 c) A pneumatic circuit for the operation of a double acting cylinder, with protection against overload is shown in fig. Analyse the circuit and describe the operation when the lever of the starting valve is momentarily depressed. [10] OR Q10) a) Write a short note on pneumatic motor indicate the specific applications of such motors. [3] b) Draw standard graphic symbols for : i) ii) iii) iv) [4] Exhaust port silencer. Quick exhaust valve. Pneumatic pressure relief valve. And valve. c) Explain the purpose of pressure regulator in FRL unit. How the performance of pneumatic actuator is affected in the absence of pressure regulator in the system? [3] d) Describe with sketch the working of pressure regulator. [3864]-152 4 [6] Q11) a) The circuit shown is used for rapid advance of Piston followed by slow motion during the actual operation of the machine. Analyse the circuit and explain how the complete operation of double acting cylinder takes place during the whole cycle. [8] b) The following details pertain to the above circuit : i) ii) [10] Initial extension of 600mm of Piston at a speed of 120 mm/s against a load of 10kN, which is followed by 200 mm advance at 50 mm/s against a load of 50kN. Assume uniform retraction against a load of 10kN. All the essential components are shown in the diag. Design the probable ratings of : 1) 2) [3864]-152 Cylinder and piston rod diameter (cylinders with 60 mm to 80 mm bore and piston rods with 20 mm to 40 mm are readily available). Flow control valve. 5 3) Pump details. 4) Spring settings for relief valve and check valve. 5) Any additional details if you feel to specify (e.g. time required for extraction) [Make suitable assumptions if required]. OR Q12) a) Design a suitable safety pneumatic circuit for the continuous reciprocating action of the piston of a double acting cylinder. The circuit should necessarily be provided with two control valves. (in addition to the other valves) to keep both the hands of operator engaged during the extension stroke. Release of one or both the hands of operator off the valves should retract the cylinder to starting position. All the valves provided should preferably have pilot operated spring return systems.[10] b) Study and analyse the circuit shown in fig. All the points marked X are connected to pneumatic power supply. [8] xxxx [3864]-152 6

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