MCQs on Bulk Deformation Processes

What is the primary goal of the rolling process in metalworking?

• To join two pieces of metal

• To reduce the thickness or change the cross-section of a long workpiece

• To heat the metal to its melting point

• To increase the tensile strength of the metal

Which of the following products is typically created through rolling?

• Complex 3D shapes

• Plates and sheets

• Small electronic components

• Injection-molded parts

What type of forging does not create any flash (spark) and completely encloses the workpiece?

• Open-die forging

• Impression-die forging

• Closed-die forging

• Upset forging

In the extrusion process, what type of extrusion involves the billet being pushed directly through the die?

• Indirect extrusion

• Hydrostatic extrusion

• Direct extrusion

• Reverse extrusion

Which of the following is a key advantage of cold extrusion?

• High levels of oxidation

• Poor surface finish

• Good control of dimensional tolerances

• High temperature requirement

What is a common defect in rolled metal products caused by improper roller speeds?

• Zipper cracks

• Alligatoring

• Waviness

• Edge cracks

Which forging process involves continuous squeezing by hydraulic presses?

• Drop forging

• Press forging

• Smith forging

• Upset forging

What material property is improved in forged parts due to the realignment of the grain pattern?

• Electrical conductivity

• Strength and ductility

• Corrosion resistance

• Magnetic properties

Which variable does NOT significantly influence the force required for extrusion?

• Extrusion ratio

• Frictional conditions

• Die material hardness

• Speed of deformation

What is the formula to estimate extrusion force (F)?

• F = A0 k ln(A0/Af)

• F = k × Af

• F = k ln(Af/A0)

• F = (A0/Af) k