GTU BE 8th Semester 180204 Automotive Hydraulics and Pneumatics (Department Elective-II ) Summer 2018 Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?VIII (old) – EXAMINATION ? SUMMER 2018
Subject Code:180204 Date:04/05/2018
Subject Name:Automotive Hydraulics & Pneumatics (Department
Elective-II )
Time:10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Give advantages of hydraulic system over pneumatic system 07
(b) Draw symbols for following hydraulic/pneumatic elements. (i) Sequence valve (ii) check valve (iii) 5/2 direction control valve (iv) Double acting double rod end hydraulic cylinder (v) shut-off valve (vi) Unloading valve (vii) pneumatic silencer
07

Q.2 (a) Draw meter in and meter out circuit with symbols. 07
(b) Explain with neat sketch working of gear pump. 07
OR
(b) Explain with neat sketch working of air motor. 07

Q.3 (a) Write short note on hydraulic fluid properties. 07
(b) Classify pneumatic actuators and give differences between hydraulic and
pneumatic actuators.
07
OR
Q.3 (a) Explain hydraulic power steering with neat sketch. 07
(b) Explain hydro-pneumatic suspension system with diagram. 07

Q.4 (a) Explain different centre position of the Direction Control Valve with line
diagram. Compare open centre with closed centre valve, critically
07
(b) Explain typical mechanism of pneumatic system with its elements .
07
OR
Q.4 (a) Describe working of mechanical ? hydraulic servo valve. 07
(b) Explain construction and working of pressure relief valve with figure. 07

Q.5 (a) What are Logic gates? Explain AND gate, OR gate and NOT gate with
application.
07
(b) List down some common cause of Failure of Pneumatic System and Suggest
remedy for the same
07
OR
Q.5 (a) What are the basic components and requirements of pneumatic systems 07
(b) Write short note on pneumatic sensors. 07
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