Instrumentation II Questions New

8/17/2019 Instrumentation II Questions New

http://slidepdf.com/reader/full/instrumentation-ii-questions-new 1/10

23

TRIBHWA}IUNTVERSITY

'

INSTITUTE

OF

ENGINEERING

Examination

Control

Division

2AT2Karttlr

Programmu

i

BEL,

BEx,BCT

i

P"tt

n[""kt

i

32

Subject:-t"t@

Candidates

are

requiredto

give

their

answers

in

their

owa

words

as far

as

practicable'

A*emPt

All

questions'

Th;

ig,r6

in

the

nargtn

indicate

Fall

Marks'

ittii,

suitable

dataif

ndcessary'

.e tools

in

msdern

industial

instrumeirtation

a)

"Microprrccessors

are

indispensibl:

Lo-?11,

i-,T::T

systerns,,.

er

u.*gri""*,

pt":"ide

a

technical

explanatioa

inciuding

block

diagrams

to

this

statement

Uv

Jfying

on

observations

&om your

case-study

-'-

design?

Design

an interface

b)

What

benefit

are

obtained

from

a memory-mapped

UO

arrangement

for

8085

rnicroprocessor

to

map

output

99ttt

i"

address

space

1000H

to

2000H

and

input

ports

ia

address

space

3000H

to

4000H.

2.

a)

consider

a

double

handsbake

scheme

thal

allol's

data

transfer

&om

an

input

'

.

peripheral

d;;;

*

sots-*i*pro""$orthrough

an

8255-PPr

t5l

1)Listatlcontroisignalstha]setexclangldbet'weenthedevices''

i0

Draw

u

ao"il"a-timing

dragram

tho*iIlg

the

exchange

of,

control

and

data

--'

,ign"l=.

lnclude

the

cause

ana

effeclSnows

in

your timing

diagram'

iii)withaneatsketchhowtheoverallsysteDxdiasrambe,tweenthemodules

nrenrfioned

above

i") a;;#;

an

appropriate

control

word

based

upon

your drawing

and

derive

the

uaOr"*

of

tm'"o"t*l

register

of

the

E255-PPI

used

inyor:r

design'

b)

List

the

c.ontroi

sigsals]Td.by

the

ISA-bIs:

Prold:

convilclg

arguments

to

justify

-

the

repracrJ;;?G

ISA

b;

by

the

pcl

bus.

carculate

the

brandwicth

of a64bit

PCI

bus

oPerating

ai'

66'N{F'z

3"

aj

'what

are

the

criteria

should

be

involved

during

the

design

of

R'S-232A

in

simplex'

-/'

HalfDuplex

and

Full

Duplexmodes'

b)

Explain

the

usB

signals

and

associated

bus

states.

Also

mention

the

signal

levels

to

I

achievethesebus

states'

'

'

7.

t4l

t4I

1

t3l

t4l

141

4.

a)

why

do

we

need

to

digitize

a

signal?

What

are

the eEors associated

with

AiD

or

D/A

t6l

converters?

-b)W}paretheselectioncriteiaforAlDorD/Aconverter?L71

r

c)

To

convert-an

analog

signal

into

digital

form,

8-bit

ADC

is

used'

The

ADC

has

eight

'

loprrt

"i,uooJtr,

*d;h;l;i

f:y

is

used

to

capixre

the

incoming

analog

sie"al'

The

address

of

the

desired

charurel

is

seni

thrrough

pi*

PBc,.

rB

1.

and

PB2.

Aft1

"t

lT:t

S0-nilloseconds,

this

address

must

be

latctred.

The

laiching

signal

is

sent'using

PB4'

Af,.ter

another

2.5-nsicrosr"onar,

pa3

is used

ta

initrate

thi

coaversion

piocess'

The

,c;Gt*oriL

pr"r"sl

i.u

signaled

via

pcs,

The

ouput

lateh

of

the

ADC

can be

gmbled1brr;*#d;,

*JAeIt

l data

can

be read

thro*gh

port

A

of

8255-PPL

tgl

-79-



i)

Draw a

circuit showing

the

interfacing

of the

ADC module,

8255-PPI

aud 8085

microprocessor_on the basis ofthe

connections described above.

ii) Drawthetiming

wa*r"ior*r

of

all the

controi and

data signals

inyolved

in

the

process.

iii)

Provide a flowchart

that depicts the ADC

process

iv) Derive

port

addresses from

your

circuit diagram

and

provide

ttre

control word

5.

a)

In

high-speed

circuits,

ngfl)rmd"

is a meaningless concept

the inoportant

question

is,

uuihat

pafh

does retutr

curre,lrt

foliow?"

Justify

&e

above statement

with

proper

reasons

aud exarnples.

t4]

b) Discuss the

importance

of

an interface

rmit.

What

factors need

to

be

accounted for

-,

u&ile

desiening

input

and

output

interface

units?

l4l

b) I{ow do

you

reduce

crosstalk

u&ea routing signal

taces ou

a

PCB?

t4l

7.

What

are the basic

principles

of signal

propagation

and circuit layout

for

Routiug Signal

Traces

wliich are

predominant

of effective

circuit

layout?

t6]

8. Pmgra.as

ue

to be

read by

humaas.

Forprograms to

be usefi,rl, reliable aad

mainhinable,

you

must

make then readable and

understandable.

Good design

and

programming

practices

s411

makg

programs

morc readable, Explain

in brief how

you

cm make.

l

programs

more

readabie.

9.

Answer the

following

questious

with respect

to

your

case

shrdy:

t8l

t12l

i) Wbat is

techno-commerciat

feasibiiity of

a system?

Provide

examples

fropayour case-

study oqperience.

ii) List

the

major

technical

drauibacks

present

in the existing MBI systern that

you

l

witnessed ai

the indusuial

site.

iii)

Giv-e

at

P*I

fu:

feasible

technical solutions

to

overcome the

drawbacits tbat

you

i

wiinessed. Show how

your

soiution wiil offer higher

reliability

and

incorporate fault-

l

d

tolerant

design

practices.

lnclude

block diagrarns.

guestion

rrould

you

anticipate? Provide a

list

of

at least

five

questioos

that

would be

asked

from

a

management

point

of

view. How

would

you

cope

with

the

qu--stions,

anri

how

would

you

convinee the

teaur

to

accept

your

deSign?

"v)Rspeatpart(d),butnowyouaretryinetoconvinceseniorerrgineers.Howwillthe

question

and answei

session

chaage compared"

to

part

(dp

vi)

Corrpare and'contrast

your

design

with

the

existing

design

in

terms

of

the foLiowing

:

mctics:

cost/performance'ratio,lsshnical

specificatiops (hardware

and

software)

and

design

complexity

(providq

diagrarns)

:

_

***.

i

-80-



23

TRIBHI'VANI'NIVERSITY

JNSTITUTE

OF ENGINEERING

Examination

Control

Division

2071

Chaitra

Subject:

- Instrumenta'tion

tr

(EX6A2)

C'andidates

are

required

to

give

their

answers

in their swn

words

as

far

as

practicable.

Attempt

All

quesrtons

Thefigures

in

the margin

indicate

Full

Marks.

Assume

suitable

data

if

neeessary.

l.

a) How

do

you

select

a

microprocessor

or

a microcontoiler for

your

project?

t3]

b) Exptain

the

block diagram

of

a rnicroprocessor based

instrumentation

system.

What

are

the

basic features

of

a

microprocessor

based instrumentation

system?

t5]

2'

3

#HTi--J:"1ltiil

r;,rer

in mode

r.

port

A

is designed

as

input

ro.

k"ybo*dI

J

wi& intemrpt

VO

port

B

is

designed

as output

for

printer

with status

check VO.

Draw the

mapping

circuit

and write

the

conti'ol

word and

address map.

t6]

a)Design

a

cable that

has a

USB

connector

at

one

end

and

an

RS-422

connector

at

the

other

-

end.

Assume

the

USB

is connected

to a iaptop and

the

RS422

connector

is

attached

to

a

printer. Your

design should

include

the following:

t5l

.

i)

Technical

natnes

of

the

pins

and

wires involved in

the

design,

ii) Intermediate

chips to maiatain

voltage

uniformity

between

*re two

standards.

iii)

Neat

and

labeied sketch

of

the

wiring between

the

turo

standards.

b) What

is'a

USB

interface

chip? Why

are they required?

Compare

and

contrast

USB device

interface

chips

and USB host

interface

chips.

t4l

a) Calculate

the

values

of the LSB, MSB,

resolution and

full-scale

output for an

8-bit

DAC

for

the

0 to

10V

range.

l2l

b)

Hotv

can

you

design

a

DAC

with 12

bit resolution with

the 8085

microprocessor

having

I

bits

data

lines?

Explain

with

suitabie block

diagram.

t6l

5.

a) What

are

the

essentiai

components

of

data acquisition

systerr?

Explain

with

the help

of

block

diagram.

t4l

b) Explain

Bluetooth

network topolory

in brief.

What are

the

advantages

of

Bluetooth

applications?

l4l

6.

a)

What

are the

characteristics

of

a safety

ground?

l2l

b)

Describe

different

ty'pes

of

noise

coupling mechanism

in

brief.

Hou. do

you

check

their

4.

t4l

redomindnce

in the

circuit?

-77

-



7

-

A

data Iogger

receives signals

from

a

Bluetooth

scattemet.

The

scattemet consists

of

three

piconets

and within

each piconet

there

are

four

bluetooth

devices. The

piconets

cornmunicate

withia themselves

and amongst

each

ottrer

using

the master/slave

pr&ocol.

tl0]

a)

Describe

an analog

transmission

mechanism

to

capture

the

blue

tooth

signals

by

the

data

logger.

Draw

a

complete

system

block

diagrafii.

b)

Describe

the

mater/slave

protocol

thd

is

present

in

blue tooth piconets

and

s.cattErnets

c)

Drarar,

the

scatternet

topology

de,picting

the

scenario

maintainid

in the

question.

Make

8.

a)

While

designing

an

electonic

insnument

you

should group

circuits

according

to

their

characteristics

to

maintain

the

correct

operation

of

each circuit.

What

are the

considerations

druiag

grouping

components

and circlits

and

what

is

the

impact

of

such

grouping?

t4l

b)

what are

the

factors

that derive

reliability

of an electronic

system?

lzl

9- Compare

and

conEast

the three

traditional

mod.els

of

sofnvare

development

with

rcspect

to

their

strengths

and

weaknesses.

Propose

a

fourth

softrrare

development

modil

that

outperforms

the

classical

methods

and

justif,

your

choice

in terrns

of retiability,

maintainability,

flexibility, portability

and reusability.

t4l

10.

Draw

te

complete

block diagram

of

industrial

process

contol

systern

involved

in

your

case

study,

Explain

why

you

want

to

implement

this

contuol

system

over

existing

one

in

terms

of

cost,

manPower

and

plant

automation.

What

problems

you

might

face after

irnplementating

-78 -



24

TRTBHUVAN

UNIVERSITY

INSTITUTE

OF

ENGINEERING

Examination

Control

Division

2fi71Shawan

./

Candidates

are

required

to

give

"*

*r*";;;;;;;;;;;;

'---

{

Attempt All

questions.

,/

Thefigares

in

the

margin

indicate

Full

Marks,

,/

Assume

suitable

data

if

necessary.

1.

Draw

and

explain

the

btock

d.iagram

of

microprocessor

based

instrumentation

system.

Also list

out advanteges

of implementing

an

MBI

system.

Explain

briefly

the

concept

of

DMA.

[4+2+21

2. Assume

that

your

group

has

decided

to

make

a

PC

based

insfumentation

control

system

for

automatic

concrete puri&ing

factory

using

an

8255

PPI card

at

base

address

4000H

in

memory

mapped

VO

mode

for

conirolling

purpose.

'

+1+7+-rr

a)

List

out

the

collected

documents

and

compone[ts.

L

i-

i-ort=

i

b)

"

List

out

the

differeat.sipals

you

need

to

derive

and

or

can

be

cormected

directly

to

your

interfacing

circuit

c)

Draw

minimurn

mapping

circuits

for the

above

system.

d)

What

are

the addresses

captured

by

your

card?

Generate

the

control

word

for

the

system.

e)

Write

a

Program

module

to

read

ten

set

of

raw

data

from port

A

and

port

B;

add

the

data

and store

the

result

starting

from

address

4040H.

-

r

3'

a)

Describe

the

problem

that

occurs

when

you

attempt

to

connect

together

two

Rs.232

devices

that

-are

both

configured

as

DTE.

Draw

u

aiugrum

whict

shows

how

this

problem

caaberesolved. I5l

b)

Explain

USBprotocois

which

should

be

followed

during

the

USB

design.

i5J

4.

What

are

char,agteristics

of

AJD

or

D/A

converters?

With

necessary

diagram

expiain

the

interfacing

of

10 bit

DAC

with

8085

along

with

timing

diagram.

5"

a)

What

is

data logger?

Explain

the characteristics

for

a

data

iogger.

b)

Write

the

advantages

and

disadvantages

of

optical

fiber

communioation.

t.

Elurirl;:t:

'.1:*

p-:tli:rl:

;l

ri,und::E?

Mer,tcx

hc'.y

r,an,,

configuations

are

a.,,,ailable

tc

prlvide

the

basic

principie

oigrour.iiiag.

7

.

a)

What

are

the

reasons

for

using

low power

design?

b)

Write

about ground

bounce,

cross

talk,

impedance

matching

and

timing

skew.

8.

Fault

toleranc.e'reduces

possibiiity

of dysfunction

or

damage

from

abnormal

stresses

and

failure.

It

has;.ti:ree

distinct

areas:

careful

design,

testable

fimctions

and

redundant

architecture.

Explain

how

w-F

can avoid

many

faitures

using

&ese three

approaches.

I' IOE

is

planning

to

apply

new

Software

for

its

database

management

sysrem.

Suggest

the

best

selection

and

purchase

procedure?

Explain

in

detail

about

giod

,;"Oi.A+

practice.

10-

riltrat

have ydu

learned

frorn

case

study?

Drara,

the

compiete

block

diagram

of

the

industrial

process

control

involved

in

your

case

study.

What

are

the

critica

factors

affecting

the

production you

have

noticed

in

the

vidited

industry

and

what

measures

can

you

suggest

for

the

same?

What problsms

you

might

face

after

implementing

your

d

process

control

s)rstem.

***_

g

L

_

12+4)

t5l

13j

.1

:1

i.:-r-l

p1

t4l

t6l

[3+s]

Year

/ Part

u2)



1

23

TRIB}ruVAN

UNIVERSITY

INSTITUTE

OF

ENGINEERING

Examination

Control

Division

2070

Chaitra

Programme

----*--"-

i

Year/Part

1.

2.

candidates

are

required

to

give

their

answers

in

their

orvn

words

as

far

as

practicable'

Attempt

4 questions.

Thefigures

in the

margin

indicate

Full Marlx'

Assume

suitable

daia

if

necessary-

Describe

the

various

PC

interfacing

techniques

involved

while

interfacing

an

I/O

device

vrith

a

PC.

Differentiate

closed

ioop

microprocessor

based

system

over

open

loop

rnicroprocessor

based system.

Explain

briefly

abgf-

C[

bus.

The

base

address

for

the

interfacing

circuit

givenbelow

is

5500

H:

a)

IdentifYthe

Port address

b)

Write

the

necessary

conlrol

words

to

initialize

the

8255

c)

Draw

the

timing

diagram

for

the

configuration

as shown

in

ltgure

below.

a) Explain

how

comrnunicaiion

takes

between

two

data

terminal

equipment

modem connection.

b)

Compare

between

RS

232C,

RS422A

and

RS423A'

c) Compare

the

standards:

UStsi'i

and

USB

2'0

Explain

the

error

associated

with

A/D

and

D/A

converters'

in

lllr.jl-l

[3+4]

[3+6]

4-

I4l

14l

121

t8l

Exam.

;-EgI- g*l-

-,i

i

P*ss

Marks

i

32

i

I"Tim-*--*-*-i-i

h*.

-l



5.

What

are

the components

used in Data

Acquisition

system,

explain

with necessary biock

diagram. Why

optical

fiber

is dominating

the

other

guided

medium

used

in

riata

transmission

schemes.

6.

a)

Describe

the

working

principle

of

decoupling

capacitor in

short.

b)

Explain

differeni

types

of noise

coupling

mechanism.

[5+3]

L2)

l4l

7.

Stqrting

froin

the

converting

the

requirement

into

design, Explain

the

procedure

of

designing

electronics

circuit.

t6l

8.

Write

about

the factors

we

should

considered

whiie doing component

placement.

What

rule

does

a

designer

have follow

while routing

signal

tracks

in

PcBs

in order

to avoid

the

effect

of iilrpedance

mismatch and

cross talk.

[3+3]

9.

Once

you

have

tested,

verified and release

software,

you

have to maintain

it.

As

with

testing,

you

cannot separate

software

maintenance frbrn system

concerns.

Discuss

at

length

how

you get

commor bugs

in software

and

develop

a

good

corrective

action

to

fix

softwarebugs

in

your

distributed

software.

18]

10.

Explain

existing system

involved in

your.case study

with

necessary

block

diagraml

Ulut

wtrs

your

recommendation

over

the existing

system in term of cost, manpower

and

plant

automation.

Ll21

**t

:i.c&i*.ri#* .ti**n.-r-#k ffiio



..4,IR}BHUVANUI\IJVERSITY

NSTITUTE

OF

ETdGINEEFJi{G

Exag?aiggatiom

CorsEroE

Bivisiorr

@x642)

/

Carrdidates

are

required

to

give

their

ans-wers

in

their

own'wcrds

as

far

as

practicable'

-

.,'

Alie:npi

4i

questions-

,/

Tne

f.gui'es

ir

tize

margin

indicate

Fwli

Mqirks'

{

Assunze

suitable

darc

if

necessary.

-t.

Draw

and

explair,

the

block

diagram

of

microprocessox

based

instrumenhtion

system'

Also,

list

out

advantages

of

implementating

*, Mgi

system

in industrial

plants

for

control

and automation.

14+41

2.

The

addresses

caprured

by

g255

pPI

are

A0A0H

to

A0A3H.

Sketch

the

interfacing

circuit

with

8085

microprocessor

in

memory

mapped

VO for

same.

What

will

be

the

contol

u'ords

far

lollowiiig

coufigrirations

of

8255

PPI?

a)

Port

A:

Mode

0 outPut

Port

B:

Mode

0

inPut

Port

C:

Mode

0 outPut

b)

Port

A:

Mode

I

outPut

Port

B:

Mode

1 inPut

PC+,s:

outPut

c)

Port

A:

Mode

2

Port

B:

Mode

I

outPut

d)

Set

PC5

in

BSR

mode

3.

a)

Serial

data

transfer

mechanisms

are

much

more

complicated

than

parallel

data

transfer

mechanisms.

But

still,

serial

data

transfers

are

preferred over

parallei data

transfers.

wny/

b)

How

can

serial

data

transfer

using

RS423A

standard

transfers

data

at longer

distances

' compared

to

RS232A

standard

for

the same

data rates?

c)

What

is

On-The-Go

protocol

in

USB

2.0?

Explain

the basic

data

transfer

mechanisms

.

used

in

USB

standards?

4.

Expiain

the

error

asscciated

with

AID

and

D/A

converters'

5.

a)

What

are

the

characteristics

of

Compact

data

logger?

Explain

with

block

diagram'

bi

What

are

piconet

and

scaternet

in

Bluetooth

device?

6.

a)

What

is a

ground loop?

How

can

we

eiiminate

them?

b)

A

commeicial

bank

has

placed its

ATM

counter

inside

a S-star

hotel.

Customers

would

walk

through

oarpeted

hallways

to reach

the

ATM

and

insert

their

debit

card

into

the rnashine

to

retrilve

cash.

However,

the bank

faced a

disturbing

problem'

-the

elecfionics

in

the

card

reader

circuitry

was failing

frequently

causing

an

adverse

effect

to

the

bank's

reputation.

What

could

have

caused

the

probiem?

Explain

the

measures

to

Prevent

this

Problem.

la.+41

I

,

'l

12+21

7.

Explain

how

the

reliability

of

a

circuit

can

be

increased

by

using

testabie

architectures

-

[3+3]

and

redundant

architectures

in circuit

design'

8'Howcancrosstalkcanbeminimizedduriagroutingthesigna1traeeinPCB,Describe

with

trace

impedance

matching

techniques'

t6]

g.

a)

Mosi

,

microprocessor

based

systems

use

embedded,

real

time

softwares

for

processiog.

Ho*

can

you

increase

the

reliability

of

such

softwares?

i3]

u;

Epi."i*"aJof

scftware deveiopment

combin"t

tlr_.

elements

of

both

waterfall

and

-

/ piototypiog

n

oJ*t.

fxplain

the

pio"*ur

of

software

deveiopment

using spiral

model.

t5i

10'Drawandexp1aintheb1ockdiagramofexistipgindustrialprocesscontroiSyStem

i_ovolved

in

yo*

"u*e

stud,v.

Explaii

yo,rnr^rrosed

iystem,nittr

aclvantages.

[6+6]

t2l

n1

L-J

12+41

t8l

t6l

121

[1+1]



]'RiB

HUV

4.N

iJ}.{iVERSiTY

I].,iSTITUTE

OF

ENGI}dEERN{G

Examsllaatiore

Comtr*l

[li,rasi#Ea

2069

Chaitra

,'/

n,

I

Exgrm"

i

E

eve|

Fregrariame

BEL,

BEX,

**i:-*-:

_*]-.^

BC,'

i

Fass

Marks

I

32

..

I

.:_

* Ewi

g::Eles91Hi-?L

11

gxl

w

Candidaies

are

required

to

give

their

answers

in

their

own

words

as

far

as

practicable.

Aitewpt

AII

questions.

T'he

figures

in the

margin

indicate

Full

Mcrks.

Assuine

suitabie

data

if

nece.s.so4],..

2'

in

a.microprocessor

based

system,

an

82554

PPi

card

is used

to

iatedace

a

keyboard

and

a

pdnter

to

the processor.

The

E255A

PFI

is

interfaced

wirh

the

8085

microprocessor

in

the

systEm

such

that

the

base

address

of

g255

A

ppl

is

4044

H.

a)

Vlhat

arethe addresses

captured

bythe

card?

b) Draw

the

complete

interfacing

circuit

of

82554

PpI

with

80g5

microprocessor

for

the

given

system.

'-E-

c)

If the printer

is

interfaced.to

port

A

and

the keyboard

is

interfaced

to port

B

of the

ppl

generate

the

control

word

to

initialize

the

82554

PPI

with

proper

expianations.

Both

printer

and

keyboard

use

8-bit

paraliel

d.ata

transfer

with

harrdshakingl-

d)

Derive

the

control

word

to

enable

internrpt

request

to

the

microprocessor

by

port

A

of

8255A

PPI

in

above

system,

with

proper

explanations.

3.

a)

Compare

the

USE

standards:

USB

1.1

and

USB

2.0

b)

Describe sirnplex,

half

duplex

and

fulldupiex

operation

using

RS-232 port.

1'

Exrl11

bti:1y_

tle

concept

of

DMA.

Draw

circuit

Diagram

of an

interfacing

circuit

containing

4

KB

ROM

and I

KB

RAM.

Assuming

Base

address

in

4000H.

you

also

need

to

drar,v

write

and

read

cycie

timing

diagram.

L2+61

t1l

t3l

t21

rnl

LLJ

t3l

t7i

4'

Whul

ar-e

t)?es

of

errors present

in a

AD

or D/A

converters?

With

necessary

d.iagram

explain

the

interfacing

a

ADC

using

intemrpt.

[3+5]

5'

a)

trxpiain

different

network

topoiogies

of

Bluetootir

cievice

witli

appropriate

diagrams.

l4l

b)

What

is

a data

logger?

Expiain

ttre

desuable

characteristics

for

a

data

logger.

1f

+11

6'

,lY^'f

different

types

of

Noise

coupling

Mechanism

with

concept

of

pseudo

lmpeoance.

7

'

What

are

the

reasons

for

using

low

power?

Meution

the guideiines

to

be

considered

for

t6]

.

power

crestgn.

p+4j

8'

A

careful

circuit

layout

not

only

makes

the

production

of

circuit

boards

easier

but

also

makes

them

less

elror

prone.

what.yler

d9"r

a

designer

have

to

follow

wrriie

routing

signal

tracks

in

PCBs

in

order

to

avoid

the

effects

of

irripedance

mismatch

aud

crosstalk?

[3+3]

9'

What

is

fault

tolerance

in

software?

What

do

you

mean

by

roll-back

recovery

and

roii-

forward

recovery?

Explain

different

types

of

bugs

in

software

lz+2+4j

10'

a)

s/hat

are

the

taoes

of

Microprocessor

based

systern

used

in

instrurnentation

system?

How

it

makes

more

benefits

in

industry?

b)

Explain

detail

about

different

processing

plant,which

you,have

stuciied

in

case

study.

i3l

Also

iraw

the

block

diagram

for

furtherlnrprovemeot

of

th"r"

"ir

prrrt

and

overall

systein.

t9l

:

-86-



24

TE.IBI{UVAN

UNIVER.SiTY

INSTITUTE

OF ENGINEERTNG

Examiesatiom

Comtro

Division

2S68

Chaitra

Exam.

tr anrol

tsE

full

Marks

80

Frogranume

BEI-.,

BEX,

BCT

Pasc

Marirs

32

Yenr/Fafi

III,'

I

Time

3

hrs.

Sub

:i"rt

r*gntation

Il

(EX

60i)

candidates

are

required

to

give

their

answers

in

their

own

w.ords

as

f,ar

as practicable.

AtternptA$quesrions.

----

-""'i

?izefigwes

in the

margin

indi*ate

{uli

futrar*s.

,4s

swne

suitab

le

dala

iri

ne

c essdti)-

'

1'

a)

one

thing

embedded

real

time

systems

have

in

common

is

that

they

include

some

tyoe

of

processor'

They

range

any

where

tom

a

r"rii-progru*

r"prt-ar"ice

to

a

full-

ledgeri

pc

on

a

chip

or

board.

,4t

s^ome

poiri,

*

*gi=n"r,

a"tial

;n;h;;il;

rocessor

to:r.

How-did

he pic,k

it? Areihere

*y

,uiionat

,"*o16

ror picking

one

over

anothel?

or

arg

all

processor

selectiols

based

on

personal

bias?

And

what

are

the

situational

factors-imposing

selection

of

;;i*r;"cessor

or

microcontroller

for

a

design.

Discuss

at

length.

b)

Cir"

a

short

introduction

of

ISA

bus.

t71

i3l

2':

You

have

to

interface

ADc

with

8085

using

82554

poris.

interface

a

fan

and

a

heater

using

opto

couplers

to

derive

tili/b

devices.-If

th"trrip"rut*"

is

less

than

t0"c,

turn

on

he

heater

and

if

the

temperature

is

higher

-1u,i.3l"d'#*

,n

the

fan.

use port

A

of

g255

for

'transferring

digitai

data

output

oi

aoc

to

the-Cpu

and

part

C

for

control

signals.

Assume

that

an

analog

input

iiprTenl

o

l."onJ

i"prrt.of

the

multiplexerand

a clock

input

of

suitable..frequelicyis

urrilubl.

for

ADC.

erroGt"

an

appropriate

flow

chart

and

,algorithm

to

facilitate

your

design.

Draw

trr.

airs'u*-or'yo*

oesiln.

tgl

3'

a)

what

is

di'saster

recovery

in

sofiware?

i{ow

could

it

be

implernented

at

your

organieation?

b)

In

the

sof,tware

developments

process,

proper

planning

is

essential

in

delivering

the

finished

product

tl.th.

client.

bqually

ii

ir

i*p".t*i'?iru,

bugu

have

to

be

removed

frorn

the product'

Discuss

in details

about

the

nature

ortrrg,

irisoftwaredeveiopment

process'

wlat

are

the

preventive

steps you

would

take

to

minimize

introciuction

of

the

bugs?

F{ov''

stub

discontinuity

cause

impedance

mismatch.

Aiso poinf

out

the

causes

of

ross;aik.

Explain

in

your

o.,vn

w-ordi

with

reievant

il;.

-

"Estabiishing

reauiremeni

is

the

most

dif;icult

part

of

eircuit

design,,.

whiie

designing

ti:e

;:T:T*t

circuit,

speci*

and

expiain

the

procedure

of

converiing

the

requiremeats

into

13l

I

5.

A

i6l

l4+11

L

"-l

I6l

tzl

a)

Diftrentiate

between

USB

1.1

itself-with

the

inter

cing

unit

necessary

diagrams,

t6l

and

USB

2.0.

State

briefly

how

USB

2..0

irientifies

and

establishes

communication

prctocoi.

D;r;;;;

b)

Expiain

rhe

functions

the

DSR,

DTR,

RTS.

crs,

?XD

and

RXD

signais.

7'

signais

from

thJee

different

transducers

(A,

B

and

ci

io-cated

100

meters

away

from

a

conttol

room

in

a

factory

are

very

importaat

to

control

stepper

motors

to give

final

tune

to

he

products.

?ire

srrensth

of

these

signals

;g;;;-rb*,

to

20mV

ilJ

separated

ar

tr.,2.

?ransducer

A, B

and

C

generate

6KFiz,

iOfU,

*Ji?;:i_:r;i;;;r*,"

Documents

Instrumentation II Questions New