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2003 Course Industrial Hydraulics & Pneumatics

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Total No. of Questions : 12] P1343 [Total No. of Pages : 4 [3664]-142 B.E. (Mechanical Sandwich) INDUSTRIAL HYDRAULICS AND PNEUMATICS (402062) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of electronic pocket calculator is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) Discuss important factors considered for selection of hydraulic fluids.[6] b) What types of heat exchangers are used in conjuction with hydraulic systems? [6] Explain with the help of graphs, the effect of temperature and pressure on hydraulic fluids. [6] OR c) Q2) a) b) c) What is the difference between static and dynamic seal? What are the sources of oil contamination? How to control it? [6] [6] Explain applications of fluid power in farm industry. [6] Q3) a) What is the function of a Hydraulic Power Unit? Explain with neat diagram. [8] b) What are the different applications of an accumulator? Explain with circuits. [8] OR Q4) a) Classify positive displacement pumps based on constructional features and oil flow. [8] An axial piston pump running at 1000 rpm. Pump has nine 15mm diameter pistons arranged on a 125mm diameter piston circle. The offset angle is set at 10 and the volumetric efficiency is 94%. Find the flow rate in L/s. [8] b) P.T.O. Q5) a) b) What is the difference between a standard check valve and a pilot operated check valve? In what applications are the pilot operated check valves useful? [8] What is a pressure compensated flow control valve? Explain with neat sketch. [8] OR Q6) a) b) State rules followed in Indian Standard of Graphical symbols for fluid power systems. Draw symbols for 1. Two pressure valve 2. Pressure reducing valve 3. Quick exhaust valve 4. Accumulator 5. Hydraulic motor 6. Intensifier 7. Direction control valve and 8. Flow control valve. [8] Define the terms Cracking pressure, full flow pressure, and pressure override. Why are the pressure override characteristics of a pressure relief valve important? [8] SECTION - II Q7) a) b) Q8) a) b) Q9) a) b) Q10)a) b) A horizontally mounted cylinder is required to extend against a load of 22000 N that is at an angle of 30 to the cylinder axis. The cylinder has a bore diameter of 50 mm. What is the required pressure? [8] Draw and explain motor breaking circuit. OR [8] Draw and explain circuit for hydraulic press with accumulator and [8] intensifier. Design a circuit to show how two sequence valves can be used in conjuction with a four way control valve to operate two cylinders in sequence. [8] Draw and explain a typical compressed air generation and distribution system. [8] A suction cup with an inside diameter of 50mm is used in a vacuum system that pulls 500mm Hg. What is the maximum lifting force? [8] OR How do pneumatic actuators and control valves differ from hydraulic actuators and control valves? [8] A double acting pneumatic cylinder with a 80 mm bore, 25mm rod and a 100mm stroke length must cycle (extend and retract) 40 times per minute. The supply pressure is 700 kPa gauge. What is the air [8] consumption of the cylinder in standard m3/min. [3664] - 142 2 Q11)a) Analyze the two hand safety pneumatic circuit shown in figure for the continuous reciprocation of cylinder piston. What will happen to the cylinder piston if one or both the control valves are released? Valve 7 is shuttle valve. [10] b) Explain the operation of a double acting cylinder when started with a push button valve as shown in figure 2. Indicate the limitation of the circuit. [8] [3664] - 142 3 Q12)a) OR A pilot operated 3/2 direction control valve 'A' is used in regenerative circuit as shown in figure 3. Draw the circuit to show the following operations. i) Fast movement of extension stroke. ii) Extension with full force applied. iii) Retraction at normal speed. And also derive equation for the same extension and retraction speeds. [10] b) Explain with proper circuit the counterbalance valve in the hydraulic power equipment. [8] Y [3664] - 142 4

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