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USN

SeventhSemesterB.E.Degreen,ffin,Dec.2015/Jan.2ol6 Hydraulics & Pneumatics

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With a neat sketch, explain the hydraulic circuit and the laws pluge&*q''i{dvelop the circuit.

ii' (08Marks) ^ .* , (07 Marks) b. Explain the working and design of a vane pump. .i c. A pump has a displacement volume of 120cm'. It delivers 1.5.r*{,{"d-3 m3/s at 1440 RPM and

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60 bar. If the prime mover input torque is 130 N-m and ov-erall efficiency 88%, find Qo - theoretical discharge of the pump i rl,,- Volumetuib€fficiency of the pump (05 Marks) t1- - Mechanical efficiency of the pump I Tlo - overa*l| efficiency.

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a neat sketch, derive the expression foq{irqt class lever systemused with hydraulic . 'E (07 Marks) cylinder to drive load. ,lr'; ; pump b. A supplies oil at 0.0016 m3/s at a 40rM diameter double acting hydraulic cylinder. If EB the load is 500N and the rod dia is 2O{firdfind i) cylinder KW power during the extending ES stroke ii) cylinder KW powq$ring the retraction stroke iir) pressure during SE t$G'5 extension and retraction stroke ".*t-iv) piston velocityJ during Qextension and retraction ' r (osMarks) l.%d' stroke. EE c. A hydraulic cylinder has ta#&re a table of weight 13kN. Speed of the cylinder is to be t I accelerated upto a velocffib.t:oy. in 0.5 seconds and brought to a stop within a distance E: of 0.02m. Aisume.p"$[ft.i.rt of sliding friction as 0.15 and cylind"ibor. diameter as E$ (08 Marks) 50mm. Calculate the surge pressure. E5 a.2 0E ;", representing various center flow paths for two position four way valves. 3 a. Write the syffidfiS a€ (06 Marks) FE (08 Marks) b. Explainffierational features of the compound pressure relief valve. a# c. Explaffi.,the construction and operation of a simple needle valve and also explain the S$ (06 Marks) expfussion for the flow rate through flow control valve. E* su 69 i a 4 a. Explain the concept of Meter in and Meter out circuit. List the advantages and limitations of (12 Marks) each of the circuit. :i a\l..1 q.m\ Explain regenerative with a neat circuit diagram and deduce regenerative speed of the ; srffilb. ' cylinder. (08 Marks) E ^.*ft s\r\\ ts

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What are the various functions performed by the hydraulic fluid and list its desirable properties and types of hydraulic fluid. Explain Beta ratio and Beta efficiency. Explain the common location of mounting filters in the hydraulic

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(06 Marks)

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Explain the laws for a perfect gas that governs the compressible nature of air. Explain the basic structure of pneumatic system with its components. Explain briefly with a neat sketch 312 way spool type direction control valve.

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,*W (lA$tffkO a. Explain a typical pneumatic circuit with OR logic using shuttle valve. b. With a neat diagram, explain the construction and the functioning of the spool ffite or

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Marks) SfO ffi *# Au. a. With a the neat circuit diagranl explain Electropneumatic control 4e touble acting (10 Marks) cylinder using a 412 solonoid acfuated spring retum cylinder. ^&-, (10 Marks) b. Explain the cylinder pneumatic circuit and its motion control diagraqffi

quick exhaust valve employed in pneumatic

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