GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2171912 Date: 26/11/2019Subject Name: Oil Hydraulics & Pneumatics
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
Q.1 (a) Draw the symbol of (1) Bi-directional variable displacement pump (2) Pilot operated pressure relief valve (3) 4/3 directional control valve. [03]
(b) List basic electrical devices used in hydraulic system. Explain working of pressure switch with neat sketch. [04]
(c) What are the functions of hydraulic fluids? List different types of hydraulic fluids. Explain high water content fluid with its merits and demerits. [07]
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Q.2 (a) Define following terms referred in filtration: (1) Mesh number (2) Silt index (3) Beta ratio. [03]
(b) List different types of piston pump. Explain stationary cylinder radial piston pump with neat sketch. [04]
(c) Classify actuators. Explain construction and working of double acting linear actuator with neat sketch. [07]
OR
(c) Explain hydrostatic transmission system with neat sketch and list its merits and demerits. [07]
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Q.3 (a) Compare positive displacement pump and non-positive displacement pump. [03]
(b) Compare external gear pump and internal gear pump. Show its operating characteristics. [04]
(c) What are the different types of vane pumps? Explain balanced vane pump with neat sketch. [07]
OR
Q.3 (a) Draw a circuit for control of single acting spring return hydraulic cylinder. [03]
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(b) Explain Hydraulic time delay valve circuit with neat sketch. [04](c) Draw and explain a hydraulic circuit for a punching operation using intensifier. [07]
Q.4 (a) Classify flow control valves. [03]
(b) Draw the neat sketch of check valve and sliding spool 2/2 direction control valve. [04]
(c) What are the functions of hydraulic accumulator? Explain gas filled accumulator with neat sketch. [07]
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OR
Q.4 (a) Classify pressure control valves. [03]
(b) Compare pressure relief valve and unloading valve. [04]
(c) What are the advantages of pilot operated valve over simple valve? Explain pilot operated reducing valve with neat sketch. [07]
Q.5 (a) Explain the function of shuttle valve. [03]
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(b) Explain basic pneumatic system with neat sketch and show all the components on sketch. [04](c) Explain working of air pilot control double acting cylinder with circuit diagram. [07]
OR
Q.5 (a) List advantages and disadvantages of automation in fluid power systems. [03]
(b) Compare pneumatic and hydraulic system. [04]
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(c) Draw and explain sequencing circuit to operate two double acting cylinder using limit valves. [07]--- Content provided by FirstRanker.com ---
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