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Question 1:

Which fabrication technique involves layer-by-layer addition of material to create a composite?

A) Injection molding
B) Compression molding
C) Filament winding
D) Additive manufacturing

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Explanation: The correct answer is D) Additive manufacturing. Additive manufacturing, also known as 3D printing, involves layer-by-layer addition of material to create a composite. This technique allows for complex geometries and customization.

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Question 2:

Which fabrication technique involves impregnating reinforcing fibers with a liquid resin and curing the composite in a mold?

A) Injection molding
B) Compression molding
C) Filament winding
D) Resin infusion

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Explanation: The correct answer is D) Resin infusion. Resin infusion involves impregnating reinforcing fibers, such as carbon or glass fibers, with a liquid resin and curing the composite in a mold. This technique allows for good fiber wetting and high fiber volume fraction, resulting in strong and lightweight composites.

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Question 3:

Which fabrication technique involves winding continuous fibers around a rotating mandrel?

A) Injection molding
B) Compression molding
C) Filament winding
D) Vacuum bagging

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Explanation: The correct answer is C) Filament winding. Filament winding involves winding continuous fibers, such as carbon or glass fibers, around a rotating mandrel in a specific pattern. The fibers are then impregnated with a resin and cured to create a composite structure with high strength and stiffness.

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Question 4:

Which fabrication technique involves compressing a pre-impregnated fiber reinforcement between heated mold halves?

A) Injection molding
B) Compression molding
C) Filament winding
D) Lay-up

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Explanation: The correct answer is B) Compression molding. Compression molding involves compressing a pre-impregnated fiber reinforcement, also known as a pre-preg, between heated mold halves. The heat and pressure cure the resin, resulting in a composite part with controlled thickness and excellent surface finish.

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Question 5:

Which fabrication technique involves injecting molten polymer into a mold cavity?

A) Injection molding
B) Compression molding
C) Filament winding
D) Vacuum bagging

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Explanation: The correct answer is A) Injection molding. Injection molding involves injecting molten polymer, such as thermoplastics, into a mold cavity under high pressure. The polymer then solidifies in the mold to form a composite part with precise shape and dimensional accuracy.