IPC CID+ Exam 2025 UPDATE/PRACTICE
QUESTIONS AND CORRECT VERIFIED ANSWERS
(complete solutions) ASSURED
SUCCESS/GRADED A+!!!
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Terms in this set (159)
The board material has significant influence on the
dielectric constant and
electrical performance of the circuit from what two
the loss tangent
effects?
Piercing post, What are the 4 types of build-up multilayers?
Sequentially built-up
multilayer, Passive
substrate, Filled via
sequential co-laminated
substrate
The temperature at which anamorphous polymer
Glass transition
changes from being a hard and relatively-brittle
temperature (Tg)
condition to be in a viscous or rubbery state
Affects dimensional stability and changes the
Moisture absorption electrical characteristic in the material which can
cause potential difficulties in assembly
Immersion, electroless, What are the 3 general methods of plating material
and electrolytic on PCBs?
, Corrosion prevention, What are the benefits of metallic coatings /
Improved long-term final(surface) finish?
solderability
Simplest of the wet processes; involves a simple
galvanic replacement reaction; the more noble
Immersion Plating
metal in the solution picks up electrons from the less
noble metal immersed in the solution and plates out
The thickness is limited to Why would you use immersion plating?
a very thin coating as it is
a simple replacement
reaction
Immersion has a flatter Why is Immersion finishes more beneficial than
base for attachment HASL?
Coplanarity / solder What are the assembly challenges/problems with
thickness varies, solder HASL process?
crowning, less uniformity
Stencil fits flat on pad, opening is smaller than the
Gasketing
land pattern in all dimensions
Uneven surfaces cause What is the problem with gasketing in HASL?
leakage of paste
underneath the stencil
Gray tin, nickel/gold, What other surface finishes are better/flatter than
nickel/palladium gold, HASL?
immersion "white" tin,
immersion silver, ENIG
What surface finish is good for BGAs and surface
ENIG
mount?
Washable masks are Why would you use a washable solder mask / what is
removable; they come off the advantage?
in a cleaning operation
QUESTIONS AND CORRECT VERIFIED ANSWERS
(complete solutions) ASSURED
SUCCESS/GRADED A+!!!
Save
Terms in this set (159)
The board material has significant influence on the
dielectric constant and
electrical performance of the circuit from what two
the loss tangent
effects?
Piercing post, What are the 4 types of build-up multilayers?
Sequentially built-up
multilayer, Passive
substrate, Filled via
sequential co-laminated
substrate
The temperature at which anamorphous polymer
Glass transition
changes from being a hard and relatively-brittle
temperature (Tg)
condition to be in a viscous or rubbery state
Affects dimensional stability and changes the
Moisture absorption electrical characteristic in the material which can
cause potential difficulties in assembly
Immersion, electroless, What are the 3 general methods of plating material
and electrolytic on PCBs?
, Corrosion prevention, What are the benefits of metallic coatings /
Improved long-term final(surface) finish?
solderability
Simplest of the wet processes; involves a simple
galvanic replacement reaction; the more noble
Immersion Plating
metal in the solution picks up electrons from the less
noble metal immersed in the solution and plates out
The thickness is limited to Why would you use immersion plating?
a very thin coating as it is
a simple replacement
reaction
Immersion has a flatter Why is Immersion finishes more beneficial than
base for attachment HASL?
Coplanarity / solder What are the assembly challenges/problems with
thickness varies, solder HASL process?
crowning, less uniformity
Stencil fits flat on pad, opening is smaller than the
Gasketing
land pattern in all dimensions
Uneven surfaces cause What is the problem with gasketing in HASL?
leakage of paste
underneath the stencil
Gray tin, nickel/gold, What other surface finishes are better/flatter than
nickel/palladium gold, HASL?
immersion "white" tin,
immersion silver, ENIG
What surface finish is good for BGAs and surface
ENIG
mount?
Washable masks are Why would you use a washable solder mask / what is
removable; they come off the advantage?
in a cleaning operation
