GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018
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Subject Code:2162004 Date:20/11/2018Subject Name:Hydraulic & Pneumatic Systems
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Mention the major area of application of hydraulic system 03
(b) Explain major parts which are essentially needed to design and 04 construct a hydraulic system.
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(c) Explain the following properties of hydraulic fluid. 07
(1) Bulk Modulus (ii) Specific Gravity (iii) System Compatibility (iv) Flash Point (v) Demulsibility (vi) Fire Resistance (vii) Lubricity.
Q.2 (a) Draw the standard symbols of adjustable pressure relief valve, 03 adjustable pressure reducing valve and pressure compensated flow control valve.
(b) Compare hydraulic system and pneumatic system with their pros 04 and cons.
(c) Explain the construction and working of external gear pump 07 using schematic diagram.
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OR
(c) Explain construction and working of proportional valve using 07 schematic diagram.
Q.3 (a) Explain gas charges accumulator using schematic diagram. 03
(b) Explain construction and working of Quick Exhaust Valve. 04
(c) With illustrative example-explain following phenomenon in 07 context of hydraulicpower transmission. “Pressure and flow rate are independent to each other”
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OR
Q.3 (a) Explain different locations of filter in hydraulic circuit. 03
(b) Draw and explain the regenerative circuit. What are the 04 advantages and disadvantages of it?
(c) Explain cushion assembly in detail for pneumatic system. What 07 is the requirement of it?
Q.4 (a) What is the significance of heating and cooling devices in 03 hydraulic system?
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(b) Give detail classification of hydraulic cylinder according to 04 construction.
(c) Show and explain the power diagram for Meter-in and Meter-out 07 circuits.
Q.4 (a) Explain construction and working of spring loaded check Valve 03 using schematic diagram.
(b) Write applications of hydrostatic transmission. 04
(c) Prepare the pneumatic system to perform automatic to and fro 07 motion of double acting pneumatic cylinder and explain working of it.
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Q.5 (a) Explain functions of FRL unit. 03
(b) Explain construction and working of logic Valve used for 04 pneumatic system
(c) Design and explain regenerative hydraulic circuit. 07
OR
Q.5 (a) Explain Overlap in hydraulic valves with sketch. 03
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(b) What is trapped oil in terms of gear pump? Explain with schematic 04 diagram.
(c) A pneumatic system is used for punching machining. Design a 07 pneumatic circuit to control a double acting cylinder using 5/2 air-air valve and time delay valve. The piston should extend when two push buttons are pressed simultaneously and automatically retract after fully extended and after specified time delay.
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