Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3151913 Oil Hydraulics And Pneumatics Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3151913 Date:22/01/2021
Subject Name:Oil Hydraulics And Pneumatics
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1 (a) What are limit switches? How do they differ
03
from push button switches?
(b) Which are the different function of hydraulic
04
oil? Also list properties of hydraulic oil.
(c)
07
Give ISO/ANSI symbol of following.
i.
Single acting cylinder with spring return
actuator
ii.
Bi-directional variable displacement
pump
iii.
Pilot operated pressure relief valve
iv.
4/3 directional control valve
v.
Adjustable flow control valve with
throttle
vi.
FRL unit
vii.
Telescopic cylinder
Q.2 (a) Explain any one method of controlling air
03
receiver pressure.
(b) Classify air compressors. Write a short note on
04
selection criteria of compressor.
(c) Cite the classification of check valves and
07
explain the function of pilot-operated check
valve, giving the necessary drawing.
Q.3 (a) Write a short note on fire resistant oil
03
(b) Explain 4/3 sliding spool direction control valve
04
working.
(c) List different pressure control valves giving its
07
application.
Explain
construction
and
working of any one in detail with the help of
neat sketch.
Q.4 (a) Explain `cushioning' of pneumatic cylinder
03
(b) Write a short note on the Quick Exhaust valve
04
(c) Explain regenerative circuit with a suitable
07
1
application.
Q.5 (a) Draw a circuit for operation of single acting
03
pneumatic cylinder using push button operated
3/2 DC valve.
(b) How continuous rotary air motors differs from
04
limited rotation air motors?
(c) Explain sequencing of four double acting air
07
cylinders with neat sketch.
Q.6 (a) In what ways, pneumatic circuits differ from the
03
hydraulic circuits?
(b) Explain cascade system for circuit design using
04
assumed sequence.
(c) Explain with suitable circuits how the single
07
acting and double acting hydraulic cylinders are
controlled.
Q.7 (a) Draw a circuit for operation of unidirectional
03
motor
using
3/2
direction
control
valve
(b) Compare fixed and flexible automation system
04
with suitable example.
(c) Draw and explain sequencing circuit to operate
07
two
double
acting
cylinder
using limit valves.
Q.8 (a) What do you mean by automation? List
03
advantages and disadvantages of automation in
fluid power systems.
(b) Give classification of automation in industry.
04
Discuss the role of automation in hydraulic and
pneumatic industry
(c) Write short note on programmed automation.
07
2
This post was last modified on 04 March 2021