CWB Module 17 Surface Inspection QUESTIONS WITH CORRECT ANSWERS

CWB
Module
17
Surface
Inspection
QUESTIONS
WITH
CORRECT
ANSWERS
Exercise
Question
-
Section
2.1-2.4
1.
The
property
of
liquids
that
makes
them
try
to
reduce
their
surface
area
is
known
as:
a)
capillary
action
b)
surface
tension
c)
viscosity
b)
surface
tension
Exercise
Question
-
Section
2.1-2.4
2.
True
or
False
The
ability
of
a
liquid
to
wet
a
solid
surface
can
be
measured
in
terms
of
the
contact
angle
True
Exercise
Question
-
Section
2.1-2.4
3.
The
phenomenon
by
which
water
rises
up
a
narrow
tube
or
by
which
a
liquid
can
penetrate
a
crack
is
known
as:
a)
capillary
action
b)
surface
tension
c)
viscosity
a)
capillary
action Exercise
Question
-
Section
2.1-2.4
4.
How
must
a
fluorescent
dye
be
viewed?
Under
black
light
Exercise
Question
-
Section
2.1-2.4
6.
What
type
of
developer
is
normally
used
with
the
solvent-removal
process
to
spot
check
welds?
Non
aqueous
Exercise
Question
-
Section
2.5
1.
True
or
False
The
fluorescent
post
emulsified
penetrant
process
is
often
recommended
for
high
sensitivity
applications
such
as
detection
of
fatigue
cracks
True
Exercise
Question
-
Section
2.5
2.
Does
the
liquid
penetrant
process
work
on
stainless
and
aluminum?
Yes
Exercise
Question
-
Section
2.5
3.
Give
one
way
in
which
a
change
to
a
liquid
penetrant
procedure
could
be
qualified.
Using
a
Comparator
block
Exercise
Question
-
Section
2.5
True
or
False
4.
When
using
liquid
penetrant
inspection,
the
surface
must
be
ground
smooth
to
remove
all
irregularities
before
applying
the
penetrant
False
-
Grinding
can
flow
the
surface
and
conceal
defects Exercise
Question
-
Section
2.5
5.
According
to
ASTM-E165
the
surface
temperature
for
liquid
penetrant
inspection
should
not
be
outside
the
range:
a)
12
Celsius
to
52
Celsius
(60F-125F)
b)
21
Celsius
to
24
Celsius
(70-75
F)
c)
-18
Celsius
to
38
Celsius
(0-100F)
a)
12
Celsius
to
52
Celsius
(60F-125F)
Exercise
Question
-
Section
2.5
6.When
using
the
solvent
removable
method,
why
should
the
solvent
not
be
sprayed
directly
on
the
surface
to
remove
excess
penetrant?
It
may
leach
penetrant
out
of
discontinuities
Exercise
Question
-
Section
2.5
7.
True
or
False
When
using
post
emulsifiable
penetrants,
the
emulsifier
must
remain
in
contact
with
the
surface
long
enough
to
mix
with
the
excess
penetrant
but
not
long
enough
to
reach
penetrant
in
the
discontinuities
True
Exercise
Question
-
Section
2.5
8.
What
could
be
the
effect
of
spraying
on
too
much
developer?
It
could
mask
indications
Exercise
Question
-
Section
2.6
to
2.7
1.
What
is
the
difference
between
a
false
indication
and
a
non-relevant
indication?
False
indications
are
not
associated
with
discontinuities,
non
relevant
indications
are.