PH8151 ENGINEERING PHYSICS QPaper Jan 2018

Question Paper 2 Pages

Anna University

Civil Engineering

Contributed by

Naresh Tella

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A
nawer
ALL
que8t.ion8,
PART-A
1.
What
are
the
cff,ec,1,a
of
ha
.mmering
and
annealing
on
elaatidty
of
a
material
1
2,
Wh
J:n.
a wire
ia
bent back
and
forth,
it
becomes hot.
Why?
3.
Define
forced
and
damped
oacillationB.
4.
How
will
you
classify optical
fibers
based on
the
material?
·
5.
Distinguish
between
conduction
and
convection.
·
6,
For a free particle moving within a
one
dimensional potential
box,
the
ground
state
energy cannot be
zero,
why
?
1:;
State
Wien's displacement law.
{\'+t
8,
Wpat is a bimetallic strip
?
Give its applications.
I . , • ,
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--'
,
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.
\.
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---:
• •
• • • -
..
•
9.
Fo
r
a
cubic
system, sketch
the
planes
with miller
Indices (110), (101), (011).
10_.
Determine
the lattice constant for FCC lead
~stal
of
radius
1.
746A-
~
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.
;
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Page 1
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PART-B
lL""
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··- . · /,
·.
r ·
· .
· ·
tof
.
in
,.
: _.
is
Tors
_ .
}.l
'.
~nd
ulum
? E."tpla
in
how._
it
is
used
to
deterJlline
the
momen
(lG) ,
(5Xl6=80
Marks
.
~ . a.nd
n~dil}
..
_
modulus
of
th~
rn
ate
n~l
of.a
thin
w~.
·
.
-
·
.(OR)
....
~~;e"
•n
e.~~ssion
for
th
e
deflection
P~uce
_d
at
t}_le
~~
~nd
of
a re.ctangu_lar
C'.Sn"'11ever
~ubJected
to
point
I
:-id
at
-
f~e
end.
What
Will
be
the
deflectwn
pro
·
-d
1t
die
free
end
,
with
sallle
load,
if
the
cantilever
is
of
circular
- .
s.s
.section.
(16)
··
.,
.
.
.
'
,·
' . .
-
.
·.:
1
,':.
.
e,.
~dl'e
a
~omojuncti
on
se
in.icondu
tor
laser
with
a
he~ro
Junction
se.::ruoonductor
laser
and
detail
their
features.
(OR)
(16)
~eri\·e
~
ekpre~sion
for Acceptance atlgle
and
Numerical
aperture
of
an
optical
r.
Bnngout
th
e
differences
between
step
index
and
graded
index fiber.
(12+49
- · -
a.
}
i)
How
will
you
determine
the
tbernk!
conductivity
of
a
poo~
conductor
using
Lee
's
disc
method.
Give
the
necessary
theory.
,
n A
metal
cube
takes
5
minutes
to
coal
from 60
°C
to
52
°c.
How
much
time
~ill
it
take
to cool
to
44
°C,
if
the
temperature
of
the
surroundings
is
32°C?
' (12+4)'
.(OR) __ .
'
-
.
...
-.
'
:
b)
How
are
hea.t
exchangers
helpful
in
refrigerators, ovens
and
solar
water
heater
?
(16)
4..
a
·
\Yb.a
is
Compton
effect?
Give
the
theory
of
Compton
effect
and
show
that
the
Compton
shift.
(16)
i,.'
-l
=
_E_(l-cose)
mec
(OR)
b)
\\11at
are
the
draw
backs
of
classical
free electron
theory?
Deriv:e Sc}?,r?edinger
·:
time
dependent
and
time
independent
wave
equation~. .
· ·
(2+7+7)
.a
What
is
packing
fact.or
? Obtain packing factors
for
SC,
Bcq,
FCC
an~~
3
~~+~
+'.~}
structures. ' . , .
-;
·,
,.
,
'.
,"
-·
'
(OR)
:.
b
'·
W
·tea
note
.on point
imperfections~ crystals. Discuss
in
de~
·
~n
a·s~itable:
..
_:
·
< -.
' n .
I . .
.·.
.
(8+8)
method
to
grow
single
crystal
of
semi~
_nducting
matena
_
s.
,._
·
.·
_·
-,:
· ·.
·:
.
r
...
..
.
;
,
.'
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...
.
·.:
..
,.
'
..
/\
'
. :
..
,
..
•
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