WorksheetsUnit 3 and 4 quiz
Total questions: 20
Worksheet time: 19mins
Which of the following is the first step in powder metallurgy?
A) Sintering
B) Compaction
C) Powder Production
D) Finishing
Which process is commonly used to produce metal powders in powder metallurgy?
A) Cold rolling
B) Atomization
C) Annealing
D) Extrusion
Which of the following factors affects the compaction process in powder metallurgy?
A) Particle size and shape
B) Alloy composition only
C) Melting point of the powder
D) Cooling rate
What is the primary advantage of powder metallurgy over traditional casting methods?
A) Lower melting point
B) Greater material strength
C) Reduced machining
D) Lower density
What is the primary purpose of sintering in powder metallurgy?
A) To melt the powders
B) To remove impurities
C) To bond powder particles by solid-state diffusion
D) To create pores in the material
What is the main disadvantage of powder metallurgy?
A) High material utilization
B) Limited shapes and geometries
C) Requires high melting temperatures
D) Slow production rates
What is the purpose of a lubricant in powder metallurgy pressing?
A) To enhance sintering
B) To reduce friction during compaction
C) To increase porosity
D) To alter chemical composition
In powder metallurgy, the process of applying pressure to shape the powder into a desired form is known as:
A) Sintering
B) Compaction
C) Alloying
D) Grinding
Which type of bonding primarily occurs during the sintering process in powder metallurgy?
A) Ionic bonding
B) Covalent bonding
C) Metallic bonding
D) Hydrogen bonding
Which method is commonly used to produce metal powders in powder metallurgy?
A) Melting and casting
B) Electrolysis
C) CNC machining
D) Rolling
The term “green compact” in powder metallurgy refers to:
A) Powder after sintering
B) Compacted powder before sintering
C) Powder before compaction
D) Scrap powder
In which extrusion method is the billet forced through a stationary die by applying a ram pressure, where the metal flows opposite to the ram direction?
A) Forward extrusion
B) Indirect extrusion
C) Direct extrusion
D) Radial extrusion
The process where a metal workpiece is squeezed between two dies to shape it with localized compressive forces is known as:
A) Rolling
B) Extrusion
C) Forging
D) Drawing
Which of the following is an advantage of hot rolling over cold rolling?
A) Better surface finish
B) Improved dimensional accuracy
C) Easier to shape due to reduced yield strength
D) Less energy required for deformation
In the extrusion process, the material flows:
A) Through a die to create a desired cross-section
B) Between two rotating rollers to reduce thickness
C) Into a mold where it solidifies
D) In a random direction without control
A major difference between hot working and cold working processes is that:
A) Cold working produces larger grain sizes
B) Hot working does not cause strain hardening
C) Cold working requires heating to high temperatures
D) Hot working increases surface finish
Which of the following is a disadvantage of hot working?
A) Increased hardness of the material
B) Poorer surface finish
C) Increased risk of cracks due to work hardening
D) Increased dimensional accuracy
Cold working processes are typically performed:
A) At room temperature or below recrystallization temperature
B) At temperatures above recrystallization temperature
C) Only on brittle materials
D) Only on non-metallic materials
Which of the following changes occurs to the material structure during hot working?
A) Strain hardening
B) Grain refinement with dynamic recrystallization
C) Higher porosity
D) Phase transformation into martensite
Cold working is typically associated with which of the following outcomes?
A) Increased ductility
B) Decreased hardness
C) Increased strength and hardness due to strain hardening
D) Increased grain size
