Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3151709 Process Instrumetantion Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3151709 Date:03/02/2021
Subject Name:Process Instrumetantion
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) Draw and define at least three instrument symbols which usually refer in
03
P + I diagram.
(b) Describe with the net sketch of design layout for control room panel.
04
(c) Write the necessity of Instrument Air supply (IAS) in process control.
07
Draw standard Instrument Air supply (IAS) system and describe the role
of each component of IAS system in details.
Q.2 (a) Draw and describe flow characteristic of process control valve
03
(b) Emenurate the control valve operation according to valve plug motion
04
(c) How will the application of pneumatic control valve is advisable in
07
hazardous process area? Explain working of air to open pneumatic control
valve with its net sketch. Also discuss benefits offer over air to close type
valve.
Q.3 (a) Justify an application of Angle and Needle types control valves in process
03
plant control system.
(b) What is Pinching mechanism? Brief the application of this mechanism as Pinch
04
control valve with its salient features.
(c) What are the salient features of diaphragm type control valve? Draw and
07
describe working of diaphragm valve with its actuator. Brief its benefits
over conventional control valve.
Q.4 (a) Describe following control valve design consideration
03
(1) Dead band (2) Valve Response Time (3) End connection
(b) List control valve accessories. Express the working of hand wheel in
04
conjunction of valve operation
(c) Define valve coefficient (Cv) and describe the function of control valve
07
in process loop. Brief how valve co-efficient is helpful to size the capacity
of control valve.
Q.5 (a) Draw and describe at least two indicator
03
(b) What are the needs of recorder? Explain the working of circular chart
04
recorder
(c) How will valve positioners are helpful for improving valve operation.
07
Describe motion balance type Valve positioners with its net sketch and
advantages offered.
Q.6 (a) Draw and describe the working of 2-wire transmitter with benefits
03
offered by it.
(b) How will you design an annunciation system? Describe it operation
04
sequences with figure.
1
(c) What are the requirements of safety relief valve in industry? Describe
07
safety relief valve with its construction, working and design benefits.
Q.7 (a) Draw and describe the working of 4-wire transmitter with benefits
03
offered by it
(b) Discuss the need of rupture disc as safety instrument. Describe it
04
operation with net sketch in detail.
(c) Draw and describe operation of pneumatic to electric converter as well as
07
current to pneumatic converter.
Q.8 (a) Describe with net sketch the working of force balance type pneumatic
03
transmitter.
(b) Explain with circuit diagram the working of V to F converter
04
(c) What is the meaning of S.M.A.R.T. in transmitter terminology? Discuss
07
the operation of SMART transmitter with its construction and salient
features.
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This post was last modified on 04 March 2021