INTEG 2 MD

Long sides

In pure torsion, the maximum torsional occurs at the center of the

28 to 31

The modulus of elasticity for ordinary steel usually falls between____ millions pounds per square inch.

stiffness

The modulus of elasticity is a measure of

tension

The modulus of elasticity for most metals in compression is

usually taken as that in

section modulus

The ratio of Moment and stress

zero

For a symmetrical cross-section beam, the flexural stress is

____ when the vertical shear is maximum.

approximately the same

When tested in compression, ductile materials usually

exhibit characteristics up to the yield strength as they when

tested in tension.

60%

As one example, the ASME Code for riveted joints permits

the design surface compressive stress to be about ____

higher than the design tensile stress.

relative strength

In a pressure vessel, the ratio of minimum strength of joint

to the strength of solid joint is known as

5

In pressure vessel, the usual factor of safety may be taken

as

tolerance

Is the permissible variation of the size of a dimension

±0.010

If there is no fit, a liberal tolerance of the order of ____in

the machining work could be permitted.

bilateral

A tolerance where the size of a part is permitted to be

either larger or smaller than the given dimension

unilateral

A tolerance where the size of a part may be larger only, or

smaller only, than the given dimension.

unilateral

____ are generally used on those dimensions involved in a

fit such as a pin in a hole.

basic hole system

The ASA fits are based on the_____.

interference of metal

When the hole is smaller than the shaft, it will take force or

pressure to put the cold parts together. The

roughness

Is the relatively finely spaced irregularities of the surface.

waviness

Is the irregularities or departures from nominal surface of

grater spacing than roughness.

lay

Is the direction of the predominant surface pattern

1

The surface finish the micrometer anvils in rms

500 or greater rms

The surface of finish heavy cuts and coarse feed

fatigue failures

It has been said that 80% of the failures of machine parts

have been

400

For wrought steel in its commonly met commercial forms,

it is often assumed that the average endurance limit for an

average Su(50% survival), the Brinell Hardness is limited to

0.23 to 0.65

Cazaud quotes values for steel showing Sn/ Su ratios, often

called endurance ratio, ____.

stress raiser

Is the discontinuity or change of section, such as scratches,

holes, bends, or grooves, is a

stress concentration factor

The degree of stress concentration is usually indicated by a

residual stress

In a part at uniform temperature and not acted upon by an

external load, any internal stresses that exist are called

autofrettage

Is a process of prestressing or over-stressing a hollow

cylindrical member beyond the elastic range by hydraulic

friction

When two touching surfaces have a high contact pressure

and when these surfaces have minute relative motion, a

phenomenon called

surface rolling

Is the process that cold works a limited amount of material,

thus giving a higher strength, and it leaves a surface

compressive stress.

Thermal-shock failure

When a hot part is cooled suddenly by quenching, there is

momentarily a high temperature gradient that induces a

stress gradient. Some metal parts under certain conditions

crack as a result; this phenomenon is called

coaxing

Fatigue strength is increased by repeated loads just below

the normal fatigue limit, followed by a small step by step

increases of the loading, a process is called

major diameter

Is the diameter of the imaginary cylinder that bounds the

crest of an external thread and the roots of an internal

thread.

lead

Is the distance in inches a screw thread (a helix) advances

axially in one turn.

UNC

Is recommended for general use.

UNF

If frequently used in automotive and aircraft work

UNEF

Is particularly useful in aeronautical equipment.

8 UN

Is used on bolts for high-pressure pipe flanges, cylinder

head studs etc.

initial stress

Then stress or load induced by the tightening operation

62%

For non-metallic gaskets, it has been found that they

should have a certain minimum amount of compression as

____ for a certain cork gasket.

bolt

Is a screw fastening with a nut on it

screw

Is one that has no nut and turns into a threaded hole.

machine bolt

An old name for an unfinished through bolt, comes with a

square.

coupling bolt

Is a type of bolt finished all over, usually having coarse

threads.

carriage bolt

Is a type of bolt distinguished by a short portion of the

shank underneath the head being square or finned or

ribbed.

stud bolt

Is a type of bolt threaded on both ends and can be used

where a through bolt is impossible.

stove bolt

Is a cheap variety of bolt made in small sizes.

lag screw

A large wood screw, is used to fasten machinery and

equipment to a wooden base.

1.5D

The length of contact in a tapped hole should be a

minimum of about ___ for cast iron.

dowel pins

When the location of bolt is such that it would normally be

shear, it is better practice to use

lock washers

Is a locking device used to maintain pressure between the

threads of the bolt and nut.

speed nut

Provides excellent locking properties for light assemblies.

measure the thickness

Which of the following is not the use of spring?

spring index

It is the ratio of mean diameter of coil over the coil diameter.

solid height

Is the overall length of the spring when it is compressed

until all adjacent coils touched

free length

Is the length of coil spring under no load.

more than 0.5%

In general, steel springs are made of relatively high-carbon

steel usually

500%

When heat-treated wire is coiled cold, it should be stress

relieved for bending stresses after cooling by being heated

at some ____.

hard drawn wire spring

Is a low cost spring material, suitable where service is not

severe and dimensional precision is not needed.

music wire

Is a hard drawn also (80%reduction), but it is made of high

grade steel.

chromium-silicon

Is a spring wire with good quality for impact loads and

moderately high temperatures.

garter spring

Is a type of coil where the helical coil is wrapped into a circle

forming an annual ring

motor spring

A type of spring where thin flat strip wound up on itself a

plane spiral, usually anchored at the inside end.

belleville spring

A type of spring made in then form of a dished washer.

buckling

A type of failure due to unstability.

slenderness ratio

Is the ratio of the length of the column and the radius of

gyration of the cross-sectional area about a centroidal axis.

Eueler’s formula

Formula that applies to a very slender column.

uniaxial

If two principal stress is zero, the sate of stress is

biaxial

If one principal stress is zero, the state of stress is

triaxial

If all the principal stresses have finite values, the system is

Yield stress/factor of safety

Under theories of failure, for static loading of ductile

material, the design stress is

half

Under theories of failure, the value of shear stress is ____

that of tensile stress.

the same

The theory of mechanics of materials shows that the results

from the octahedral shear stress theory and those from the

maximum distortion-energy theory are

axial pitch

Is the distance measured axially, from a point on one

thread to the corresponding point in an adjacent thread.

lead angle

Is the angle between a tangent to the pitch helix and a

plane normal to the axis of the screw.

14.5°

For ACME thread the pressure angle normal to the thread is

0.10

If the thread surfaces are smooth and well lubricated, the

coefficient of friction may be as low as

0.125

For doughtful workmanship, the recommended coefficient

of friction of thread is

self locking screw

A screw that requires a positive torque to lower the load,

or to loosen the screw if it has been turned tight against a

resistance.

shaft

Is a rotating member transmitting power

axle

Is a stationary member carrying rotating member

transmitting power.

main shaft

A line shaft is also

all of these

Is the shaft intermediate between a line shaft and a driven shaft

spindles

Short shafts on machines are often called

zero

For shafts, the shear due to bending is maximum at the

neutral plane where the normal stress is

1 degree

Criteria for the limiting torsional deflection vary from 0.08°

per foot of length for machinery shafts _____ per foot.

20

For transmission shafts the allowable deflection is 1 degree

in a length of ___ diameters.

0.01 in per foot

An old rule of thumb for transmission shafting is that the

deflection should not exceed ____ of length between

supports.

0.002 in/ft

In general, for machinery shafts, the permissible deflection

may be closer to

0.003 in

Gleason states that at bevel gears, sizes 5 in to 15 in, the

gears should not be lift or depress more than

critical speed

The speed at which the center of mass will be equal the

deflecting forces on the shaft; the shaft with its attached

bodies will then vibrate violently, since the centrifugal force

changes its direction as the shaft turns is

1.5

For shaft, the minimum value of numerical combined shock

and fatigue factor to be applied in every case to the

computed bending moment is

A & B

Most keys are

4.5

It is suggested that the design factor on yield strength be

about 1.5 for the smooth load, about 2 to 2.5 for minor

shock loading, and up to ___ severe shock loads, especially

when the loading reverses during operation.

1.25D to 2.4D

Typical hub lengths fall between ____

gib-head keys

A key that is square or flat and tapered with head.

pin key

A key may either straight or tapered. It is usually a drive fit.

rollpin

A key with one several patented methods of keying, is

driven or pressed into a hole that is small enough to close

the slit, assembled in radial direction.

tangential keys

Kennedy keys is also known as