Quiz on Dislocation Movement and Ferrous Alloys

What is the effect of grain boundaries on metal strength?

• They weaken the metal.

• They have no effect on metal strength.

• They make the metal more ductile.

• They strengthen the metal.

What role do foreign atoms play in a crystal lattice?

• They make the lattice more flexible.

• They distort the lattice and block dislocation movement.

• They have no effect on the lattice.

• They make the lattice more brittle.

What is the primary element in ferrous alloys?

• Carbon

• Iron

• Nickel

• Chromium

What is the carbon content range in plain carbon steel?

• 0.03%–1.2%

• 1.2%–2.0%

• 4.0%–6.0%

• 2.0%–4.0%

Which element in alloy steel increases toughness?

• Vanadium

• Nickel

• Chromium

• Molybdenum

What is the effect of higher carbon content in steel?

• Increases hardness but decreases ductility

• Decreases hardness

• Decreases strength

• Increases ductility

Which element in alloy steel enhances wear resistance?

• Vanadium

• Molybdenum

• Chromium

• Nickel

What is the carbon content range in cast iron?

• 0.03%–1.2%

• 1.2%–2.0%

• 2.0%–4.0%

• 4.0%–6.0%

Which element in alloy steel improves hardness at high temperatures?

• Nickel

• Chromium

• Molybdenum

• Vanadium

What is the primary use of cast iron?

• Creating lightweight structures

• Producing high-strength wires

• Making flexible materials

• Applications like engine blocks, pipes, and cookware