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WorksheetsHardness Test- Rockwell, Double Shear test, Torsion Pendulum
Total questions: 20
Worksheet time: 10mins
Rockwell test utilizes ___________ a measure of hardness.
Load
Depth of indentation
Diameter of indentation
Time of loading
What is a limitation of the Rockwell test?
Slow speed
Personal error
Bigger size of indentation
Different indenters
When a section is subjected to two equal and opposite forces tangentially to the section, the stress produced is known as
Tensile stress
Lateral stress
Shear stress
No stress
To obtain double shear in N/mm^2 given failure load (P) in kg, area of c/s( A)in mm^2, which equation is correct?
P / (4 x A)
(P / A)
P / (2 x A)
(2 x P) / A
A: Yield Strength, B: Modulus of Elasticity, D: Tensile Strength, E: Strength at Failure
A: Modulus of Elasticity, B: Yield Strength, D: Tensile Strength, E: Strength at Failure
A: Modulus of Elasticity, B: Yield Strength, D: Tensile Strength, E: Strength at Failure
A: Yield Strength, B: Modulus of Elasticity, D: Strength at Failure, E: Tensile Strength
A material’s ability to resist denting or scratching is called:
toughness
hardness
tension
torsion
When equal and opposite forces are applied to a body, tend to elongate it, the stress so produced, is called ____________
Shear stress
Compressive stress
Tensile stress
Transverse stress
Units of strain
cm/cm
m/m
N/cm2
No unit
A brittle material has
No elastic zone
No plastic zone
Large plastic zone
None of these
The stress at which extension of a material takes place more quickly as compared to an increase in load is called
No elastic zone
Plastic point
Yield point
Breaking point
Which of these are true?
Hardness is tested using a standard machine to make an hole in the surface of the material
Hardness is tested using a standard machine to make an indentation in the surface of the material
The width of the hole determines the hardness of the material
The size of the indentation determines the hardness of the material
‣metal returns to its original dimensions when force is removed
brittleness
ductility
plastic
elastic
Mechanical Properties refers to _____ except
behavior of material when external forces are applied
•The ability of a component or a structure to withstand the forces applied to it
•What makes materials strong → helps us to design a better new one
failure of material
Modulus of rigidity is the ratio of ______
Lateral strain and linear strain
Linear stress and lateral strain
Shear stress and shear strain
Shear strain and shear stress
When we're talking about a pendulum, what does T stand for?
pi
period
length
gravity
Which of the following affects the period of a pendulum?
mass
length of the string
tension of the string
shape of the mass on the string
Complete- The shorter the string, the _____________ the swings.
greater
less
What happens to the period for a pendulum as gravity increases?
doesn't change
decreases
increases
what is the moment of inertia of Cylinder?
2 1MR2
MR2
32MR2
41MR2
