basic electronics july 2014
TRANSCRIPT
-
8/9/2019 Basic Electronics July 2014
1/3
First/Second Semester
B.E.
.r;;1irTF\.
m
g.ffiB
loElNls/2s
r B.E.
Degree
E$}Itarg$rYn"e/Julv
2ot4
Basic
EleetronlH$-=r'z
USN
'
l'
-'.1.
,l.T[ne:
3
hrs.
Max.
Marks:-]00
,::,
.
Not$:'L. Answer any FIVE
full
questions, choosing at least two
from
each
part.
-
.
i
.g
tA"swer
all
objective type
questions
only
in OMR sheet
page
5
of the
awwer"booklel
fi
3.".A&swer
to objective
type
questions on
sheets other
than OMR
will
noJb[fualued.
o.
d
E
-^-- ^
:..,..::
....
PART-A ,
::.:-:,
(d
..
; ,&,,
t
E
I a.
Choosd'the,,correct answers
for the
following
:
,,,, :i
04
Marks)
$ i\
Zener
diode
can be used
for rectification. This statement
is;
'''
E
g
A)
true,ri],,''
B) fa1se.'.L"''",,,,,",,
''
8.E
C)
neither
(iiuid
nor false
D)
none d$these
yf
E
* ii)
The
maximume,fficiency
of fulIwave rectifier
is
:,:,,.,,,
o*
l,'
A)
40.6%
B\
60.4%
C)
78.s%
D) 8t.2%
troo
=
*,
iii) The knee voltage of
a
silicon diode
is
_.
E
+-
H
qa
A)
0.3V Blqsv
-
ir,\
C)
0.7V
D)
none of
these
; :
iv)
If f Hz
is the frequency of$e input
givd#tb
a
half wave
rectifier,
the output
frequency
ts6
E
'F
i'r,
.tr
1, ,d
oB
R
q
At)2fHz
B)
fHi+";,,,.'.,,,,,.......,,,,. C)3fHz
D)
0.5fHz
E
g
^)
/-L LtL D) L ttL
:1,:..-::,r::::::,,,,,,,:::::
v) JL ttL u) v.JL
LLL
F r ::::::
::
.-a
E
E
b.
Draw
and explain the VI
-.fruratG;titics
oFa.ffi-diode and Ge-diode.
(06
Marks)
b
U
i:::;:. rr i*r. s,
.
.. rl r :r L:c. ,,
-,-a
;
;
c.
With
a neat circuit diagrarn, explain
the working
principles
of full
wave bridge
rectifier
and
F"
i
show that the ripple factor
:
0.48, and efficiency
=
$t.2o/o.
(10
Marks)
o0tr
.9(
E5
t,
=E
s5
Ei
:,
X
2 a.
Choose
the correct
answers
for
the
following
:
(04
Marks)
:'o
'
e
i) The current conduction
in BJT
is because
of_.
E
E"
A)
electrons
B) holes
E
q
C)
F-oth
electrons and
holes
D) none
of
thebe,."}*
;
E
ii)
If
a
i
0.95,
then the value
of
B
of transistor
is
_.
;
s
A)
0.05
B) le
c)
100
D)
120
E
'E
iiil Common collector affansement is senerallv
used for
E
E iv)
The current relationship between
two
current
gain
in
a
transistor
is
_
$P
A)p=-g- B)p=l*o c)p=l-o
D)B=-ljg
55
'-'Y
l-a
"'Y
l-a
"tY
l+a
B
E fi
iiD
Common collector
affangement
is
generally
used
fot
-
6 F
A) impedance matching
B)
voltage
amplification
lE
- 'it.
"';
ra\
^-.-.^.^+
^*-r:{:^-
T\\ *^.^^
^f+L^^^
"':".':"".:l
E
* .. iv)
The current relationship between
two
current
gain
in
a
transistor
is
_.
..'
ES
50
.-.:e*i
s
b.
Draw input
and output
characteristics
of
an
NPN
transistor
in
common
base configuration
o
Z
and explain.
(10
Marks)
E
c.
For a
Silicon
transistor
crdc
-
0.gg5,
emitter
current
is 10 mA and
leakage current I.o
is
F
3
0.5pA.
Find
Is,
Ie,
0
and Icso.
(06
Marks)
1 of3
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-
8/9/2019 Basic Electronics July 2014
2/3
').
10ELN15/25
;
(04
Marks)
a.
Choose
the correct
answers
for
the
following
:
i)
Which of
the
following
factor affects the
Q-point
stability?
A) I"o
C) emitter resistor
B)
coupling
capacitor
D)
bypass
caphcitor
ii)
The inter
section of the dc load line with
given
base current curve
is
the
A)
h-point
B)
D-point
C)
Q-point
D)
none
of thestil:,.r
n\ s .ii
iir)
For
an
emitter follower,
the
voltage gain
is
The
best biasing
stability is
achieved
by
using
biasing method.
,,,,.
'
A)
fixed B) collector to base
C) voltage divider
D)
roni of
these
;,
'""',,
"
"''
n.{he
working of collector-to-base bias circuit
using
an
NPN transisor
and derive
the
i
,ii;,
b.
equanOm#gr lB.
,,,,,,,,.iii",,,,,,,_"'
'
(08
Marks)
c. Define st5bitity factor and discuss the factors
that cause insability
of
biasing circuits.
,,:,
,,,,:,t,
,.
i,.'0"*
""
(08
Marks)
eQuatloffiftSf fs.
::::::.
::''
't
(08
Marks)
nanr n
{
.;::1..':,=..,..,i:
PART
*
B
.
?r ..
i)
Osc-illffir
uses
_
tlpe of
feedback.
$'==fo'sitive
B)
negative
C)
reverse
D)
both
A
and B
il)
,.jffe
frequency
of oscillations in
an oscillator
is
given
by
_
.
.,....,,"
-
A)
:=
B)
2nLC
c) 2nJrc
D)
,
l=
=,
'
2nLC
'
)".|y-C
{-
-=
iir) With
negative feedback,
the
bandwidth
of
an amplifier
_
A)
decreases
B)
increases
c)
both
A
and
B
D)
constant'
iv)
The magnitude
voltage gain at
half power
frequencies
of an RC
coupled amphfi'er
is
_
times maximum
voltage
gain.
A)
0.707
B)
7.07
C)
10
D)
17.06
".,
b.
Draw the
frequency response
of an RC-coupled
amplifier
and explain
it.
Mention
its
advantages and
disadvantages.
(08
Marks)
c.
Explain
with
the help of
circuit
diagram the
working
of
an RC
phase
shift oscillator
using
transistor.
(06
Marks)
d.
In
a transistor colpitts
oscillator having
tank
circuit
parameters
as
c1
:
0.001
pF
and
c2
:0.01
pF
if
L:
5pH, calculate the frequency
of
oscillations. (02
Marks)
i) FET
is controlled device.
[;,
A)
voltage
"",*:..
B)
current G),,pulse
D)
power
ii)
PNPN device is
an"
"''.
A)
UJT
ffi4CR
r'4,*
C) MOSFET
D) MODFET
iir)
used as
a
rehxhtion oscillator.
A)
MOSFET
B)
SCR
C)
BJT
D)
UJT
iv)
The intrinsic
standoffratio of'Iitrffi-*"
A) equal to
one
B)
must
be
less
than
unity
C) must
be
greater
than
uffi.;{
'
.,,,,,,,,,,,,,
D)
must
be zero
':it l.:i]q-,r,
b.
Explain
the
working
of
tw-d-,fCnsistor
model
onu*SCn
and obtain
the
expression
for
the
anode
current.
-
,,...=
'-:1
(0g
Marks)
' c.
Draw
the equivalent
cffi#it
and
Vl-characteristic of
UJ{
and
explain
it.
(08
Marks)
A) unity
2
of3
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-
8/9/2019 Basic Electronics July 2014
3/3
10ELN15/25
6 a.
Choose the correct
answers
for
the
following :
(04
Marks)
i) The
gain
of the voltage
follower is
A) zero
B)
infinite C)
ii) Ideally open loop
gain
of op-amp
is
A)0 B)1
C)*
1
:
iii) The
CMRR
is
given
by_.
,::'
'':'
,:,,r;;,,,":',,,.
A)
Aa
''\
B)
A*/Ad
C)
Ad/&
aiv)Maximumrateofchangeofoutputvo1tagewithtimeisca11ed
,,;.,.,,..
A)
CMRR
B)
slew
rate C) over
rate
D)
nou4,bf
these
"''',,,''',,,
*,t:;'""""""
b.
Lilt&
characteristics
of
an ideal-op-amp
and draw the three
input
invertliry'Summercircuit
usinglm'op-amp
and
derive
an expression
for
output
voltage.
, 1.,
(08
Marks)
c.
Draw
tffibasic
block
diagram
of
a cathode
ray tube
and
explainl
.
(08
Marks)
,:;#,,1,,,
.
$'
7 a.
Choose the corlwtaanswers
for the
following
:
"
,{}:*'
(04
Marks)
i)
Two's comp"HaX .tof
(1001)2
is
_
,
*
A)
1001
B)
0010
c)
0111
D)
1010
ii) To represent 35 in binary,
number of bits required is
_
A)
6 ,'prl
,.
,C)
4
D) 33
iir) Decimal number 37 is rdif-poented
inBCD
6y
A)
100111
B) 00+.1,1
1
'',,,,,--,,
C)
00110111
D)
111100
iv) Over
modulation exists
when
ion index is
_
A) 1
"'
0
,,,,-.',,
=,,_
..
a,
,t
D)
<
1
.::
.:.
. :
b. Explain the need for modulatiq;-..,
'
i'
(06
Marks)
c. Convert(A3B)ro:(
)ror#
Q47.75)rc:(
')r,.
(04Marks)
d. i) Perform
(FC02A)16-=.(ffiSZ)ru
using
16's
corylement.
ii)
Subtract(4317.64),x'.fr.om(42.345)3 using
8's
comffipiyrent.
(06Marks)
8 a.
Choose the corr-ebt''l rswers
for
the
following :
'
- -
(04
Marks)
i) The expression for half adder
carry with input A
TLB
isgjven by
_.
A)h;{#fB B)
AB
C)
A B
-*4-
D) none
of
these
.i
,:ii
:::
ii)
Ttrtu"EomplementofA+B+
lis
ir.,,,"",,,,,,,.
r)
,
r*rswvurHlwu
.t*fj
'::::::'
,'.,A)0
B)A+1 C)AB+I
"':)1
-iu].,,,::'ABCD
+
ABD is equal to
_
"
,,1$4
.
A)
ABC
B)
ABC
c) ABD
D)'A,qH*,
"'iv)
A+(B+C):(A+B)+Cis_law.
"..
A)
associative
B)
commutative
C)
distributive
D) none
offhpse
t'.,,,,,,j'
,,,,:,,,,,"1:'
Design
a
full
adder
circuit
andreaLize, using two half
adders.
(08
MriIsF
Simplify
the
following expressions and
implement using
only
NAND
gates
:
i)
Y=ABC+eec+ngc+agC
ii)
Y=eg+AC
iii)Y=A+Ae.
*****
3 of3
(08
Marks)
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