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? – \u2026ANSWER\u2026Conformal 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 – \u2026ANSWER\u2026Most 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 – \u2026ANSWER\u2026Method 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.
Measling – \u2026ANSWER\u2026Internal 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 – \u2026ANSWER\u2026Internal 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 – \u2026ANSWER\u2026Delamination 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.<\/p>\n\n\n\n
Delamination – \u2026ANSWER\u2026Separation between plies within base material, between a
base material and a conductive foil or any other planar separation within a printed
board.
Weave Texture – \u2026ANSWER\u2026Surface 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 – \u2026ANSWER\u2026Surface condition of a base material in which the
unbroken fibers of woven glass cloth are NOT completely covered by resin.
Haloing – \u2026ANSWER\u2026condition 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) – \u2026ANSWER\u2026A 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 – \u2026ANSWER\u2026Heat-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 – \u2026ANSWER\u2026Provides 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 – \u2026ANSWER\u2026May 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.
Electrostatic Discharge (ESD) – \u2026ANSWER\u2026The rapid transfer of a static electric
charge from one object to another at a different electrical potential.
Electrostatic Discharge Sensitive (ESDS) – \u2026ANSWER\u2026Components and assemblies
are damaged by these electrical energy surges.
-ESDS components can fail to operate, or may change in value due to improper
handling or processing.
-immediate failures usually require replacement of the component.
Classification: Class 1,2,3<\/p>\n","protected":false},"excerpt":{"rendered":"
IPC A 610 EXAM LATEST 2023-2024 ACTUAL EXAM100 QUESTIONS AND CORRECT DETAILEDANSWERS WITH RATIONALES|AGRADEWhat is the purpose of Conformal Coating? – \u2026ANSWER\u2026Conformal coatings can beused 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 ascorrosion, mold growth, and electrical 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-117971","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/117971","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=117971"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/117971\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=117971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=117971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=117971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}