Machine Design

The moment of inertia of a rectangle whose base is b and height h about its base is

\frac{bh^{3}}{3}

The maximum stress induced in a material when subjected to alternating or repeated loading without causing failure is

Endurance limit

The total deformation measured in the direction of the line of stress is

Strain

The maximum stress to which a material can be subjected without a trace of any permanent set or remaining upon complete withdrawal of the stress is

Elastic limit

A total resistance that a material offers to an applied load

Stress

A property of material which relates the lateral strain to the longitudinal strain

Poisson’s ratio

The ability of metal to withstand loads without breaking

Strength

The maximum stress to which a material may be subjected before failure occurs

Ultimate stress

The ability of material or metal to resist being crushed is called

Compressive strength

Which of the following is not a strength property of metals?

Rocking strength

The ability of metal to withstand forces, thus following number of twists

Shear strength

A total resistance that a material offers to an applied load

Stress

The ability of a moving body to perform work

Kinetic energy

The deformation that results from a stress and is expressed in terms of the amount of deformation per unit length

Strain

The ability of the material to return to its original shape after being elongated or distorted when the forces are released

Elasticity

The last point at which a material may be stretched and still return to its undeformed condition upon release of the stress

Elastic limit

The ratio of stress to strain within the elastic limit

Modulus of elasticity

The ability of a metal to withstand forces that cause a member to twist

Torsional strength

The ability of metal to stretch, bend or twist without breaking or cracking

Ductility

The property of a material which resists forces acting to pull the material apart

Tensile strength

What is the range of the tensile strength of common varieties of cast iron?

150–400\text{ MPa}

The compression members tend to buckle in the direction of

least radius of gyration

In testing a material for endurance strength, it is subjected to

Completely reversed load

Which of the following stresses that is independent of loads?

Residual stress

During tensile test, which of the following stress-strain curve(s) is for a glass rod?

A sudden break

The internal stresses that exist in any part of the material that is subjected to temperature and not acted upon by an external load

Residual stress

In case of a knuckle joint, the pin is most likely to fail in

Double shear

The maximum stress which is reached during a tension test

Tensile strength

The strength of a material is that of a stress intensity determined by considering the maximum test load to act over the original area of the test specimen

Ultimate strength

A test for pipe used for coiling in sizes 2 inches

bend

The ratio of stress to the corresponding strain below the proportional limit

Modulus of elasticity

The total amount of permanent extension of the gage length measured after the specimen has fractured and is expressed as percentage increase of the original gage length

Elongation

A metal characteristic that withstand forces that causes twisting

Torsional strength

The hardness of helical and herringbone gear teeth after heat treatment is 210 to 300 Brinell hardness for gear and pinion is at

340–350 normal

What is the property of a material which resists forces acting to pull the material apart?

Tensile strength

The center of gravity of a solid pyramid or cone with a total height of H is

\frac{1}{4} H

Finding the resultant of two or more forces is called

Composition of forces

The phenomenon of continuous stretching under load even if the stress is less than the yield point

Creep

Statement that a given body is in static equilibrium means that the body cannot

Have any type of motion

The three-moment equation may be used to analyze a

continuous beam

Poisson’s ratio is the ratio of

lateral strain to longitudinal strain

The smallest area at the point of rupture of a tensile specimen divided by the original area is called

Percentage reduction of the area

A system of forces in space is in equilibrium. If two equal and opposite collinear forces are added, which of the following (if any) is true?

Equilibrium is maintained

Permanent deformation or strain may occur without fracture

plasticity

The ability of metal to be deformed considerably without rupture is called

plasticity

Stresses that are independent loads

Residual stress

Continuous stretching under load, even if the stress is less than the yield point

Creep

Opposite-direction parallel forces

couple

The ratio of the moment of inertia of the cross-section of the beam to the section modulus

Measure of a distance

Which of the following is the differential of the shear equation?

load of the beam

It is arbitrarily defined as the push and pull

Force

The changes in shape or geometry of the body due to the action of a force on it is called deformation or

Stresses

Internal stress exerted by the fibers to resist the action of outside force is called

shearing stress

It is the ability of the material to resist deformation under stress

stiffness

In general, the design stress and factor of safety are related as follows:

Design stress = ultimate stress divided by factor of safety

The single force which produces the same effect upon a body as two or more forces acting together

Resultant force

Ratio of unit lateral deformation to the unit longitudinal deformation

Poisson’s ratio

A property of matter which causes it to resist any change in its motion or state of rest

Inertia

Separate forces which can be so combined are called

Concurrent forces

Endurance strength is nearly proportional to the ultimate strength but not with

Yield strength