IPC CID UPDATED| ACTUAL Exam Questions
and CORRECT Answers 100%
dielectric constant and the loss tangent - The board material has significant influence on
the electrical performance of the circuit from what two effects?
Piercing post, Sequentially built-up multilayer, Passive substrate, Filled via sequential co-
laminated substrate - What are the 4 types of build-up multilayers?
Glass transition temperature (Tg) - The temperature at which anamorphous polymer
changes from being a hard and relatively-brittle condition to be in a viscous or rubbery state
Moisture absorption - Affects dimensional stability and changes the electrical
characteristic in the material which can cause potential difficulties in assembly
Immersion, electroless, and electrolytic - What are the 3 general methods of plating
material on PCBs?
Corrosion prevention, Improved long-term solderability - What are the benefits of
metallic coatings / final(surface) finish?
Immersion Plating - Simplest of the wet processes; involves a simple galvanic
replacement reaction; the more noble metal in the solution picks up electrons from the less
noble metal immersed in the solution and plates out
,The thickness is limited to a very thin coating as it is a simple replacement reaction - Why
would you use immersion plating?
Immersion has a flatter base for attachment - Why is Immersion finishes more beneficial
than HASL?
Coplanarity / solder thickness varies, solder crowning, less uniformity - What are the
assembly challenges/problems with HASL process?
Gasketing - Stencil fits flat on pad, opening is smaller than the land pattern in all
dimensions
Uneven surfaces cause leakage of paste underneath the stencil - What is the problem
with gasketing in HASL?
Gray tin, nickel/gold, nickel/palladium gold, immersion "white" tin, immersion silver, ENIG -
What other surface finishes are better/flatter than HASL?
ENIG - What surface finish is good for BGAs and surface mount?
Washable masks are removable; they come off in a cleaning operation - Why would you
use a washable solder mask / what is the advantage?
Process to ensure that plated through holes are prevent from being contaminated by the
assembly cleaning and plating process chemistries - What is plugging?
Plugging - For liquid photo imageable masks, what via process does IPC recommend?
, Tenting - For dry film masks, what via process does IPC recommend?
Manufacturers will mix and match the various prepreg products - What will
manufacturers do to get proper flow characteristics of the prepreg material and gain better
performance of the multilayer structure?
Polyimide material can be used for the outer layers of a multilayer while inner layers are
standard epoxy-grade product - For surface mount and for the outer layers to be heat-
resistant, what can the manufacturer do to help this?
Same material is used/only slight variations occur between different material properties. Resin
flow of the prepreg must be consistent between the layers - In terms of material
performance capability, how do you achieve homogenous construction?
Differences in overall resin content and the use of different styles of glass cloth; more
resin/glass content can produce the same external thickness - What variation in
construction change the physical and electrical performance of pcbs?
SPC (Statistical Process Control) - Integral part of the manufacturing and testing process;
considered in all aspects during the manufaturing process and NOT confined to an evaluation at
the end of the line
In-process coupon evaluation may be cross-sectioned and evaluated; first article inspection may
be performed to ensure the remainder of the lot would be in conformance - What is an
example of an SPC?
Test coupons / specimens - These specimens are representative of a the product
produced and must represent the process
and CORRECT Answers 100%
dielectric constant and the loss tangent - The board material has significant influence on
the electrical performance of the circuit from what two effects?
Piercing post, Sequentially built-up multilayer, Passive substrate, Filled via sequential co-
laminated substrate - What are the 4 types of build-up multilayers?
Glass transition temperature (Tg) - The temperature at which anamorphous polymer
changes from being a hard and relatively-brittle condition to be in a viscous or rubbery state
Moisture absorption - Affects dimensional stability and changes the electrical
characteristic in the material which can cause potential difficulties in assembly
Immersion, electroless, and electrolytic - What are the 3 general methods of plating
material on PCBs?
Corrosion prevention, Improved long-term solderability - What are the benefits of
metallic coatings / final(surface) finish?
Immersion Plating - Simplest of the wet processes; involves a simple galvanic
replacement reaction; the more noble metal in the solution picks up electrons from the less
noble metal immersed in the solution and plates out
,The thickness is limited to a very thin coating as it is a simple replacement reaction - Why
would you use immersion plating?
Immersion has a flatter base for attachment - Why is Immersion finishes more beneficial
than HASL?
Coplanarity / solder thickness varies, solder crowning, less uniformity - What are the
assembly challenges/problems with HASL process?
Gasketing - Stencil fits flat on pad, opening is smaller than the land pattern in all
dimensions
Uneven surfaces cause leakage of paste underneath the stencil - What is the problem
with gasketing in HASL?
Gray tin, nickel/gold, nickel/palladium gold, immersion "white" tin, immersion silver, ENIG -
What other surface finishes are better/flatter than HASL?
ENIG - What surface finish is good for BGAs and surface mount?
Washable masks are removable; they come off in a cleaning operation - Why would you
use a washable solder mask / what is the advantage?
Process to ensure that plated through holes are prevent from being contaminated by the
assembly cleaning and plating process chemistries - What is plugging?
Plugging - For liquid photo imageable masks, what via process does IPC recommend?
, Tenting - For dry film masks, what via process does IPC recommend?
Manufacturers will mix and match the various prepreg products - What will
manufacturers do to get proper flow characteristics of the prepreg material and gain better
performance of the multilayer structure?
Polyimide material can be used for the outer layers of a multilayer while inner layers are
standard epoxy-grade product - For surface mount and for the outer layers to be heat-
resistant, what can the manufacturer do to help this?
Same material is used/only slight variations occur between different material properties. Resin
flow of the prepreg must be consistent between the layers - In terms of material
performance capability, how do you achieve homogenous construction?
Differences in overall resin content and the use of different styles of glass cloth; more
resin/glass content can produce the same external thickness - What variation in
construction change the physical and electrical performance of pcbs?
SPC (Statistical Process Control) - Integral part of the manufacturing and testing process;
considered in all aspects during the manufaturing process and NOT confined to an evaluation at
the end of the line
In-process coupon evaluation may be cross-sectioned and evaluated; first article inspection may
be performed to ensure the remainder of the lot would be in conformance - What is an
example of an SPC?
Test coupons / specimens - These specimens are representative of a the product
produced and must represent the process
