Module 1 - Elements in Machine Design

to disconnect or connect at will the drive

The function of clutch in machine tool is:

Addendum

Height of tooth above pitch circle or the radial distance between pitch circle and top land of the tooth

Angle of obliquity

In involve teeth, the pressure angle is often defined as the angle between the line of action and the line tangent to the pitch circle. It is termed as

Twisted in opposite direction

In the selection of wire rope, regular lay means wires and strands are arranged in the following manner.

Offset bearing

also called eccentrically loaded bearing is

poisson’s ratio

the property of material that related the lateral strain to longitudinal strain.

angle of thread

the angle included between the side of the thread measured in an axial plane in a screw thread.

6000

Flat leather belting not recommended for use in an excess of _ fpm

stiffness

ability to resist deformation under stress

module

the reciprocal of the diametral pitch or the ratio of pitch diameter to the number of teeth

hunting tooth addition

for an evenly distributed and uniform wear on each meshing gear tooth, the ideal design practice is to consider

strain

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

Force

could simply define as simply push or pull

load of the beam

he differential of the shear equation is which one of the following:

worm gear

gear use to transmit power at high velocity ratios between non intersecting shafts that are usually but not necessarily at the right angle

measure of a distance

the ratio of the moment of inertia of the cross section of the beam to the section modulus is

couple

opposite direction of parallel forces

tool and die

which of the following is the structural class of fuel

creep

continuous stretching under load even if the stress is les than the yield point

26 to 28

it is recommended for high speed application that the minimum number of the teeth in small sprocket should be:

english module

in gear design, the ratio of the pitch diameter in inches to the number of teeth

fillet curve

the concave portion of the profile where it joins the bottom of the tooth space

whole depth

the distance of the tooth which is equal to the addendum and dedendum

residual stress

stresses that are independent of loads

rack gear

it is uses to change the rotary motion to reciprocation motion:

8 times

it is recommended not to have a direct drive and sprockets if the ratio of their teeth exceeds _ use two or more step combination

retarted motion

the motion of an object diminished/decreased speed

50/50

most popular soldering material:

casting

the following pertain to joining of metals except:

silicon

killed steel is always associated with

4 to 80 water to 1 oil

the usual ratio of water to soluble oil used as cutting fluid

all of these

the good deoxidizer in steel melting

all of these

good stabilizer in stainless steel

all of these

what is or are the common cutting fluids used for cutting metals?

grease

it is considered semi solid lubricant

the electrons are loosely bound to the nuclei and therefore mobile

metals are conductive because

washer

the purpose of these parts in applications are to have better bearings to seal the guard against marring, etc.

cold working

the yield strength of a regular yellow brass (65 to 70% Cu, 30 to 35% Zn) can be increased or improved by

0.20

used in a cast condition steel casting with carbon content less than _ %C.

cast iron

lines normally are made of

yield strength

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

induction furnace

a furnace used in melting non ferrous metals

all of these

alloy that improves strength of steel at high temperature application

0.56

in gear design the total work load must be equally shared by its arm. Rim must be rigid to support these arms and also the bead is recommended for its stiffening value. The assignment in the detailed design of rim thickness and depth of the bead is _ circular pitch

chordal thickness

tooth width measured along the chord at the pitch circle:

micrometer

the best instrument for measuring a thousand inch:

southeast asia iron and steel institute

all of these associated with standard material specification except

all of these

the allowable stresses that are generally used in practice are 4ksi for the main power transmitting shaft, 6ksi for lineshaft carrying pulleys and 8.5ksi for small, short shaft or countershaft, etc. With these allowable stresses what will be simplified formula to determine transmitted HP, diameter of shaft or even rpm

plain scriber

machine tool used for laying straight lines on metal surfaces made of sharp tool steel is called

clearance

it is the difference of addendum and dedendum which is equivalent to the whole depth less working depth

spindle gear

a lathe machine threading mechanism

concurrent force

separate forces which can be so combined are called

inertia

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

interference of metal

negative allowance is also called

center cut

which of following is not used to resemble the shape of tool bit?

square thread

a kind of thread in which width of the thread is approximately equal to the depth of the thread and the space between threads are approximately equal.

bench centers and dial indicator

a shaft is to be checked for concentricity. A suitable method of performing the check is

1.25 - 4

for moderate speed of mating gears, the ideal ratio of contact is

major diameter

nominal diameter of bolts is the

turret lathe

a lathe with multiple cutting station

screw threads

major and minor diameter are commonly used in

lead

the distance of a helical gear or worm gear would thread along its axis in one revolution if it were free to move axially is called

depth of engagement

length of contact between two mating parts in a screw and nut threads measured axially is called

uniform motion

if the velocity of a mass is the same all the time during which motion takes place is called

tachometer

device use to measure accurately speed

interference of metal

when the hole is smaller than the shaft, it will take pressure to put the parts together. The allowance is said to be negative and is termed as

conservation of momentum and conservation of energy

when two elastic bodies collide, which of the following laws can be used to solved for the resulting velocity

plasticity

the ability of a metal to be deformed considerably without rupture is called

plasticity

permanent deformation or strain may occur without fracture

kinematics

it is the science of motion that can be solved in terms of scalar or vector algebra

equilibrium is maintained

a system of force in space is in equilibrium. If two equal and opposite collinear forces are added which of the following if any is true

babbitt

metal that assists lubrication or lubricant itself

dividing head

a mechanism which is usually do the indexing in a machine tool

all of these

it equalizes the energy exerted and the work done thus preventing excessive or sudden changes

percentage reduction of area

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

linear impulse

the product of the resultant of all forces acting on a body and the time that the resultant acts

tool and die steel

which of the following is not a structural class of steel

lateral strain to the longitudinal limit

poison’s ratio is the ratio of:

SAE 74XX

all are associated with the grade of steel except?

poison’s ratio

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

ultimate strength

the maximum stress to which a material may be subjected before failures occurs

bevel gear

hyboid gear is a special type of gear like

80

considered a maximum safe center distance of sprockets should be _ pitches. Very long center distance cause catenary tension in the chain

harder

cold working of steel plates makes the material:

59

recommended best cutting angle of drill for work on steel or cast iron is _ degrees

50

in shear pin or breaking pin design we may be use the data experienced by link belt for 1/8 inch to 1 pin and the breaking stress is_ ksi'.

kinematics

deals only with the motion of bodies without reference to the forces that causes them

ductility

the property that characterizes a material stability to be drawn into a wire

continuous beam

the three moment equation may be used to analyze

all of these

what is the common shop practice to prevent the solder from running aways from its surface to be joined?

braze welding

non ferrous filler metal is melted into grooves or as fillet on the mother metal, the base metal is not melted. This commonly used for joining iron based machine parts or in repair works of some materials. It is called

15 to 20

it is advised that in rubber belts application/mounting, it should have an initial tension of _ inch/ply

450 to 550 F

Normal stress relieving temperature for cast steel

nickel

most effective alloying element for reducing brittleness of steel at very low temperature

have any type of motion

statement that given body is in static equilibrium means that the body cannot

600 - 700

ordinary steel begins to lose strength and elasticity significantly at about _ F.

2130mm(max)

clearance to a new boiler installation to the existing or old plant building should follow a minimum clearance of _ between top of the boiler proper and the ceiling as stated in the PSME code

8%

for high corrosion resistance stainless steel, what minimum chromium content is required?

4500

v-belts operates efficiently at speed of about

helical

what type of gear used for high speed operations