IPC A 610 EXAM LATEST 2023-2024 ACTUAL EXAM 100
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES|AGRADE
What is the purpose of Conformal Coating? – ANSWER- Conformal
coatings can be used in a wide range of environments to protect printed
circuit boards from moisture, salt spray, chemicals and temperature
extremes in order to prevent such things as corrosion, mold growth, and
electrical failures.
Measuring wet coating (2)
Wet Film Comb – ANSWER- Most common method to measure wet
coating. The gauge consists of a series of combs with different distance
between the marked points and the baseline. After placing the comb into
the wet coating film, the thickness can be measured in Microns or Mils.
Measurement determined by the number between the last tooth coated
and the following tooth which is free of coating.
Measuring wet coating (2)
Wet Film Wheel – ANSWER- Method to measure wet coating using two
outer wheels fixed to a central spindle wheel. Thickness is measured by
rolling the wheel on the maximum scale towards accurately ground zero.
When rolling the wheel on the coated board, the central wheel will touch
the coating. The first point of contact on the central wheel determines
the wet film thickness.<\/p>\n\n\n\n
Measling – ANSWER- Internal condition occurring in laminated base
material in which the glass fibers are separated from the resin at the
weave intersection. This condition manifests itself in the form of discrete
white spots or crosses below the surface of the base material, and is
usually related to THERMALLY INDUCED STRESS.
Crazing – ANSWER- Internal condition occurring in the laminated base
material in which the glass fibers are separated from the resin at the
weave intersections. This condition manifests itself in the form of
CONNECTED white spots or crosses below the surface of the base
material and usually related to MECHANICALLY INDUCED STRESS.
Blistering – ANSWER- Delamination in the form of a localized swelling
and separation between any of the layers of a lamination base material,
or between base material and conductive foil or protective coating.
Delamination – ANSWER- Separation between plies within base
material, between a base material and a conductive foil or any other
planar separation within a printed board.
Weave Texture – ANSWER- Surface condition of a base material in
which a weave pattern of glass cloth is apparent although the unbroken
fibers are completely covered with resin.
Weave Exposure – ANSWER- Surface condition of a base material in
which the unbroken fibers of woven glass cloth are NOT completely
covered by resin.<\/p>\n\n\n\n
Haloing – ANSWER- condition existing in the base material in the form
of a light area around holes or other machined areas on or below the
surface of the base material. Mechanically induced fracturing or
delamination on or below the surface of the base material; a Light area
around the holes, other machined areas or both.
(a light ring around a hole on a circuit board)
FOD (Foreign Object Debris) – ANSWER- A generic term for a
substance, debris, particulate matter or article alien to the assembly or
system.
ex: wire and lead clippings, hair, dust, non-ESD safe objects.
Solder Mask Coating – ANSWER- Heat-resisting coating material
applied to selected areas to prevent the deposition of solder upon those
areas during subsequent soldering. Solder Mask material may be applied
as a liquid or a dry film. (ex: pink masking)
Conformal Coating – ANSWER- Provides a barrier layer to the surface
of an electronic assembly to provide protection against the end use
environment.
-distribution depends partly on the method of application and may affect
visual appearance and corner coverage.
Dipping – ANSWER- May have a drip line or localized build-up on the
edge of the board. This build-up may contain small amount of bubbles
but it will not affect the functionality or reliability of the coating.<\/p>\n","protected":false},"excerpt":{"rendered":"
IPC A 610 EXAM LATEST 2023-2024 ACTUAL EXAM 100QUESTIONS AND CORRECT DETAILED ANSWERS WITHRATIONALES|AGRADEWhat is the purpose of Conformal Coating? – ANSWER- Conformalcoatings can be used in a wide range of environments to protect printedcircuit boards from moisture, salt spray, chemicals and temperatureextremes in order to prevent such things as corrosion, mold growth, andelectrical failures.Measuring […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-116787","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/116787","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=116787"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/116787\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=116787"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=116787"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=116787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}