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IPC-A-610 Test questions with correct answers
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IPC-A-610 Test questions with correct answers
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IPC-A-610 Test questions with correctanswers
3 |types |of |Conformal |Coating: |Acrylic |Resin |(AR) |- |correct |answers✔✔This |type |of
|coating |provides |FAIR |elasticity |and |general |protection. |It |has |high |dielectric
|strength, |and |fair |moisture |and |abrasion |resistance. |This |coating |is |different |from
|others |because |its |facility |for |removal. |This |type |are |EASILY |and |quickly |removed
|by |a |variety |of |solvents, |often |without |requiring |agitation. |This |makes |rework |and
|field |repair |very |practical |and |economical. |This |type |doesn't |protect |against |solvents
|and |solvent |vapors.
3 |types |of |Conformal |Coating: |Silicone |Resin |(SR) |- |correct |answers✔✔This |type |of
|coating |provides |EXCELLENT |protection |in |a |very |wide |temperature |range. |This
|coating |provides |good |chemical |resistance, |moisture, |and |salt |spray |resistance, |and
|is |very |flexible. |This |type |is |NOT |abrasion |resistant |because |of |its |rubbery |nature,
|but |this |property |does |make |it |resilient |against |vibrational |stresses. |Commonly
|used |in |high-humidity |environments. |Removal |can |be |CHALLENGING. |requiring
|specialized |solvents, |long |soak |time, |and |agitation |from |a |brush.
3 |types |of |Conformal |Coating: |Urethane |(Polyurethane) |Resin |(UR) |- |correct
|answers✔✔This |type |of |coating |is |known |for |its |EXCELLENT |moisture |and |chemical
|resistance. |It |is |also |very |abrasion |resistant. |Combining |those |factors |with |its
|SOLVENT |RESISTANCE |results |in |a |conformal |coating |that |is |very |difficult |to
|remove. |Like |SR, |full |removal |generally |requires |special |solvents, |long |soak |time,
|and |agitation |with |a |brush. |This |is |common |in |aerospace |application. |ex:
|Conathane
5 |Coating |application |methods: |Manual |Spraying |- |correct |answers✔✔Aerosol |can |or
|handheld |spray |gun. |Time |consuming |method |of |coating |for |a |small |quantity |of
|boards. |Lots |of |masking |beforehand. |Quality |and |consistency |of |outcome |are
|operator- |dependent.
5 |Coating |application |methods: |Automated |spraying |- |correct
|answers✔✔Programmed |spray |system |that |moves |the |board |on |a |CONVEYOR |under
|an |alternative |spray |head |that |applies |a |conformal |coating.
, 5 |Coating |application |methods: |Selective |coating |- |correct |answers✔✔An |automated
|conformal |coating |process |that |uses |PROGRAMMABLE |ROBOTIC |SPRAY |NOZZLES
|to |apply |the |coating |to |very |specific |areas |on |the |circuit |board. |May |eliminate |the
|need |for |masking |using |the |program. |The |UV |lamp |in |machine |helps |cure |the
|coating |right |after |it |is |sprayed.
5 |Coating |application |methods: |Dipping |- |correct |answers✔✔The |circuit |board |is
|first |immersed, |Then |withdrawn |from |the |conformal |coating |solution. |Immersion
|speed, |withdrawn |speed, |Immersion |time, |and |Viscosity |determine |the |resulting |film
|formation. |Common |for |high |volume |processing. |Masking |may |increase. |This
|method |is |good |to |coat |both |Front |and |Back |of |the |board.
5 |Coating |application |methods: |Brushing |- |correct |answers✔✔Simple |application
|method |used |mainly |in |repair |and |rework. |Conformal |Coating |is |applied |with |a
|BRUSH |to |specific |areas |on |the |board. |Low-cost |method |but |requires |lots |of
|manual |labor |and |is |highly |variable |depending |on |operator |proficiency |and
|consistency. |This |is |the |best |for |a |small |batch |or |a |single |board.
1. |Solvent |Removal
2. |Peeling
3. |Microblasting: |using |a |concentrated |mix |of |soft |abrasive |and |compressed |air |to
|abrade |the |coating.
4. |Grinding/Scaping |- |correct |answers✔✔What |are |the |Conformal |Coating |Removal
|Methods |by |IPC? |(4)
(6) |Most |Common |Coating |Defects |and |causes: |
|Capillary |Flow |- |correct |answers✔✔occurs |when |coating |migrates |from |one |area |of
|a |board |to |another, |leaving |behind |an |inconsistent, |uneven |finish |on |the |surface.
Causes: |-application |of |too |much |coating
- |coating |with |low |viscosity |or |high |surface |tension. |
|
- |low |surface |energy |of |component |being |coated.
|
(6) |Most |Common |Coating |Defects |and |causes: |
Cracking |and |Ripples |- |correct |answers✔✔Visual |cracks |and |creases |on
|components. |
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