IPC A 610 Practice Test Latest Version/ IPC A 610 Test Answers Updated / New IPC A 610 Actual Exam
Question 1: What are the characteristics of Acrylic Resin
(AR) conformal coating?
CORRECT ANSWER: 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.
Question 2: What are the characteristics of Silicone Resin
(SR) conformal coating?
CORRECT ANSWER: 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.
Question 3: What are the characteristics of Urethane
(Polyurethane) Resin (UR) conformal coating?
CORRECT ANSWER: 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
Question 4: What is the Manual Spraying method for
applying conformal coating?
CORRECT ANSWER: 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.
Question 5: What is the Automated Spraying method for
applying conformal coating?
CORRECT ANSWER: Programmed spray system that moves
the board on a CONVEYOR under an alternative spray head that applies a conformal coating.
Question 6: What is the Selective Coating method for
applying conformal coating?
CORRECT ANSWER: 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.
Question 7: What is the Dipping method for applying
conformal coating?
CORRECT ANSWER: 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.
Question 8: What is the Brushing method for applying
conformal coating?
CORRECT ANSWER: 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.