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2003 Course Industrial Hydraulics & Pneumatics

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Total No. of Questions : 12] P1514 [Total No. of Pages : 4 [3764]-152 B.E. (Mechanical Engineering) (Sandwich) INDUSTRIAL HYDRAULICS AND PNEUMATICS (2003 Course) (402062) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answer any three questions from each section. 2) Answer 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) b) c) Q2) a) b) c) Q3) a) b) c) Q4) a) b) c) List and explain in short eight applications of Hydraulics and Pneumatics. [8] What is the difference between static and dynamic seal? [4] Name and explain four types of materials used for seals. [4] OR What are the three most common reservoir designs? [6] What are the ways in which hydraulic fluid becomes contaminated? [6] Explain basic types of filtering methods. [4] What are the basic types of accumulator and explain the three significant accumulator-operating conditions? [6] A pump has overall efficiency of 0.87 and a flow rate of 45 lpm is to be used in a system that has a maximum operating pressure of 25,000 kPa. What input power required? [5] Explain Cavitation and Aeration phenomenon of Pumps. [5] OR Name the important consideration when selecting a pump for a particular fluid power application. [4] How can displacement be varied in an axial piston pump? [6] Explain Performance characteristics of positive displacement pumps and compare it with Performance characteristics of Centrifugal pump. [6] P.T.O. Q5) a) Draw symbols of the following fluid power components: i) Gravity type accumulator. ii) [9] Variable displacement pump. iii) Single acting cylinder with gravity return. iv) Double acting double rod intensifier. v) Sequence valve. vi) Pressure relief valve. vii) Check valve. viii) Duel pressure valve. ix) Shuttle valve. b) What is cartridge valve? What is the difference between slip-in and screw type cartridge valve? Explain benefits of using cartridge valve. [9] OR Q6) a) How does pressure reducing valve differ from a sequence valve in mechanical construction? [9] b) Explain in detail ways in which directional control valves may be actuated. [9] SECTION - II Q7) a) b) Q8) a) b) [3764]-152 A cylinder with 100 mm bore rotates an 300 mm lever arm in a system with a maximum operating pressure of 17,500 kPa. Determine the maximum force fo the lever when the angel between the cylinder axis and the perpendicular of the lever arm is 55 . What is the maximum torque of the lever arm at this instant? [8] Draw and explain motor breaking circuit. [8] OR Draw and explain circuit for riveting machine. [8] A hydraulic motor has a displacement of 164 cm3 and operates with a pressure of 70 bar and a speed of 200 rpm. If the actual flow rate consumed by the motor is 0.006 m3/s and the actual torque delivered by the motor is 170 N.m, find: [8] i) Volumetric efficiency. ii) Mechanical efficiency. iii) Overall efficiency. iv) The actual kW delivered by the motor. 2 Q9) a) A pneumatic cylinder is needed to press fit a pin to a hole. Design a circuit diagram with a precondition that while actuating, both the hands of the operator should be engaged. [8] b) Why is pneumatic control system termed as low cost automation? [8] OR Draw and explain: [8] i) Quick exhaust valve. ii) Time delay valve. Q10)a) b) Explain working of a typical filter regulator and lubricator (FRL) unit used in pneumatics with the help of a sketch. [8] Q11)A machine tool cross slide is moved by means of a hydraulic system. The motion of the cylinder is as follows: a) b) Initially it moves through a distance of 150 mm against a load of 15 kN in about 4 seconds. It is followed by a working stroke of another 150 mm against an effective load of 25 kN. The feed rate during this part of the stroke is required to be 1m / min. c) The load during return stroke is 15 kN. A meter-out type of circuit is used. Draw a circuit which will fulfill these requirements. Select different components used in the circuit from the data given. Mention ratings of components in case it is not available in the given data. [18] OR Q12)A 50 kN hydraulic press has a stroke of 1 m. The main ram is required to move down with a velocity of about 5 m/min. for first 80 cm against a negligible load. The ram is slowed down to a velocity of 2 m/min. for next 12cm against a load of 12 kN, followed by the working stroke of last 8 cm developing a maximum force of 50 kN. The cylinder is returned as quickly as possible and is to be held at the top most position. Draw a circuit which will fulfill these requirements. Select different components used in the circuit from the data given. Mention ratings of components in case it is not available in the given data. [18] Y [3764]-152 3 [3764]-152 4

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