MMET 201 EXAM QUESTIONS WITH VERIFIED ANSWERS LATEST
UPDATE 2026
Classification of materials - Answers Polymers, Metals, Ceramics, Composties
Newton's three laws of motion - Answers 1] objects at rest will stay at rest, and
objects at motion will stay at motion, unless acted upon an unbalanced force 2]
force=mass x acceleration 3] for every action there is always an opposite equal
reaction
3D stress rate - Answers Tension, compression, Shear, bending, Torsion
Stress vs strain - Answers Stress
- the force experienced
- measurable
- can occur in absence of strain
Strain
- change in the shape
- has no quantity
- cannot occur in the absence of stress
At what point are stress and strain no longer related linearly - Answers The yield
strength
The highest point - Answers Ultimate strength
Does plane strain or plane stress have a higher fracture toughness relative to thickness
- Answers Plane stress
Example of plain strain - Answers Pulling on a pen (the length of the pen change will
be small but the radius change will be significant
Stress formula - Answers σ = F/A
Strain formula - Answers ε = Extension - original length / original length
Area under the curve of our stress vs strain graph is called - Answers Toughness
Does brittle or ductile usually have a higher fracture toughness toughness? - Answers
Ductile (brittle has a higher ultimate strength)
Elongation - Answers How much the material stretches before fracturing
- 0 - 3% = brittle
- 3 - 20% = ductile
- 20% + = hyperelastic
, Poisson ratio - Answers Change in width of material as a function of the length
change to maintain constant volume
Types of test - Answers Compression, bending, impact, hardness, Brinell, vickers,
knoop, Rockwell
Mechanical failure - Answers Fracture, fatigue, buckling, creep
When does creeping happen - Answers - over long periods of time with constant
pressure, like over a decade glass acts like a fluid but in a month it's like a solid
How do forces act during buckling - Answers They act along the axis
Dimensional Tolerance - Answers the permissible or acceptable variation in the
dimensions of a part.
Bilateral tolerance - Answers Deviation (plus or minus) from the basic size.
Unilateral tolerancing - Answers Deviation in one direction only from the
nominal dimension.
Allowance - Answers the specified difference in dimensions between
mating parts.
Clearance - Answers the space between mating parts.
Interference - Answers negative clearance.
Why plastics and polymers have a lot of applications - Answers -Low cost
-corrosion and chemical resistance
-low electrical and thermal conductivity
-High strength to weight ratio
-noise reduction
-easy to manufacture
Polymers - Answers long chain molecules that are formed by polymerization (cross
linking and linking of monomers)
Monomer - Answers basic building block of the polymer
Degree of polymerization - Answers ratio of molecular weight of the polymer to the
molecular weight of the repeating unit.
When does friction increase - Answers when you increase the number of molecules
Linear polymers - Answers thermoplastics such as acrylics, pvc
Branched polymers - Answers polyethylene
Cross-linked polymers - Answers Elastomers such as rubber
network polymers - Answers Highly cross-linked, such as thermosets
Polymer organization - Answers -amorphous: no order
UPDATE 2026
Classification of materials - Answers Polymers, Metals, Ceramics, Composties
Newton's three laws of motion - Answers 1] objects at rest will stay at rest, and
objects at motion will stay at motion, unless acted upon an unbalanced force 2]
force=mass x acceleration 3] for every action there is always an opposite equal
reaction
3D stress rate - Answers Tension, compression, Shear, bending, Torsion
Stress vs strain - Answers Stress
- the force experienced
- measurable
- can occur in absence of strain
Strain
- change in the shape
- has no quantity
- cannot occur in the absence of stress
At what point are stress and strain no longer related linearly - Answers The yield
strength
The highest point - Answers Ultimate strength
Does plane strain or plane stress have a higher fracture toughness relative to thickness
- Answers Plane stress
Example of plain strain - Answers Pulling on a pen (the length of the pen change will
be small but the radius change will be significant
Stress formula - Answers σ = F/A
Strain formula - Answers ε = Extension - original length / original length
Area under the curve of our stress vs strain graph is called - Answers Toughness
Does brittle or ductile usually have a higher fracture toughness toughness? - Answers
Ductile (brittle has a higher ultimate strength)
Elongation - Answers How much the material stretches before fracturing
- 0 - 3% = brittle
- 3 - 20% = ductile
- 20% + = hyperelastic
, Poisson ratio - Answers Change in width of material as a function of the length
change to maintain constant volume
Types of test - Answers Compression, bending, impact, hardness, Brinell, vickers,
knoop, Rockwell
Mechanical failure - Answers Fracture, fatigue, buckling, creep
When does creeping happen - Answers - over long periods of time with constant
pressure, like over a decade glass acts like a fluid but in a month it's like a solid
How do forces act during buckling - Answers They act along the axis
Dimensional Tolerance - Answers the permissible or acceptable variation in the
dimensions of a part.
Bilateral tolerance - Answers Deviation (plus or minus) from the basic size.
Unilateral tolerancing - Answers Deviation in one direction only from the
nominal dimension.
Allowance - Answers the specified difference in dimensions between
mating parts.
Clearance - Answers the space between mating parts.
Interference - Answers negative clearance.
Why plastics and polymers have a lot of applications - Answers -Low cost
-corrosion and chemical resistance
-low electrical and thermal conductivity
-High strength to weight ratio
-noise reduction
-easy to manufacture
Polymers - Answers long chain molecules that are formed by polymerization (cross
linking and linking of monomers)
Monomer - Answers basic building block of the polymer
Degree of polymerization - Answers ratio of molecular weight of the polymer to the
molecular weight of the repeating unit.
When does friction increase - Answers when you increase the number of molecules
Linear polymers - Answers thermoplastics such as acrylics, pvc
Branched polymers - Answers polyethylene
Cross-linked polymers - Answers Elastomers such as rubber
network polymers - Answers Highly cross-linked, such as thermosets
Polymer organization - Answers -amorphous: no order
