mcq2-21

What is the primary purpose of the nitriding process?

• Enriching the surface with nitrogen
• Enriching the surface with carbon
• Heating parts in ammonia gas
• Cooling parts in air

Which two systems are commonly used for nitriding?

• Gas nitriding and salt bath nitriding
• Carburizing and annealing
• Flame hardening and induction hardening
• Case hardening and tempering

In gas nitriding, at what temperature are parts heated in a constant circulation of ammonia gas?

• 100°C
• 300°C
• 500°C
• 700°C

What is the purpose of preheating workpieces before salt bath nitriding?

• To cool the workpieces
• To relieve stress in the workpieces
• To increase the hardness of the workpieces
• To form a layer on the workpiece surface

What is the thickness of the layer formed on the surface during salt bath nitriding?

• 0.01 mm
• 0.02 mm
• 0.05 mm
• 0.10 mm

Why can parts be finish-machined before nitriding in salt bath nitriding?

• No quenching is done after nitriding
• Quenching is necessary after nitriding
• To prevent distortion during nitriding
• To increase the corrosion resistance

What is the notable advantage of the nitriding process regarding distortion and warping?

• Distortion and warping do not occur
• Distortion and warping are minimized
• Distortion and warping are significant
• Distortion and warping are prevented

Which property is exceptionally improved by nitriding?

• Hardness and wear-resistance
• Ductility and toughness
• Corrosion resistance and strength
• Machinability and toughness