Download GTU BE/B.Tech 2019 Winter 7th Sem New 2171912 Oil Hydraulics And Pneumatics Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 7th Sem New 2171912 Oil Hydraulics And Pneumatics Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
Subject Code: 2171912 Date: 26/11/2019

Subject Name: Oil Hydraulics & Pneumatics
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) 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
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
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
(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
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
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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
Subject Code: 2171912 Date: 26/11/2019

Subject Name: Oil Hydraulics & Pneumatics
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) 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
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
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
(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
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
2
Q.5 (a) Draw a circuit for operation of unidirectional motor using 3/2 direction control
valve.
03
(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
(c) Draw and explain sequencing circuit to operate two double acting cylinder
using limit valves.
07

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