Machine Design 1 (Terms OT 2) Flashcards
The property of a material by virtue of which it can be beaten or rolled into plates is called
Malleability
It is defined as the stress developed in the material without any permanent set.
None of the listed
A load that is applied at some initial velocity
Impact load
Modulus of rigidity is the ratio of
Shear stress and shear strain
What is the metal characteristic to withstand forces that cause twisting?
Torsional Strength
It is the ability of a material to be deformed considerably without rupture.
Plasticity
It is the property by virtue of which a material is deformed under the load and is enabled to return to its original dimension when the load is removed.
Elasticity
Deformation per unit length in the direction of force is known as
linear strain
If a material expands freely due to heating it will develop
No stress
The resistance of a material to indentation by a penetrator is an indication of its
Hardness
The maximum energy that can be stored in a body due to external loading up to the elastic limit is called
Strain
It is the energy stored by a body undergoing deformation.
Strain energy
Which failure criterion is applicable when failure criterion is not assumed and the mean stress and alternating stress are non-zero?
Goodman
Which pressure vessel is strongest?
Spherical vessel
The stress in the bar when load is applied suddenly is ___ as compared to the stress induced due to gradually applied load.
Double
When a material is subjected to fatigue loading, the ratio of its ultimate tensile strength to its endurance limit is __
0.5
The endurance or fatigue strength may be defined as the maximum safe stress which can be applied to a machine member under_
Variable conditions
If the size of a standard specimen for a fatigue testing machine is increased, the endurance strength of the material will ___.
Decrease
The longitudinal stress is ___ of the circumferential stress.
One-half
This type of thread is common in mechanical jack
square thread
The common type of thread for bench vise is
Buttress
Which form of thread has an included angle between the flanks of thread of 29 degrees?
ACME Thread
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to
completely reversed load
The design of the thin-walled pressure vessel is based on ___.
longitudinal and girth stresses
Which of the following cannot be measured directly by precision instruments?
Pitch diameter
When helical compression spring is cut into quarters, the stiffness of the resulting spring will be
Quadruple
What form of thread is suitable for lead screws of machine tools?
ACME thread
This type of threads is suitable for small precision components and measuring gauges.
BA thread
Line joining Sy (yield strength of the material) on mean stress axis and Sn’ (endurance limit of the component) on stress amplitude axis is called as _.
Soderberg line
When a helical compression spring is subjected to an axial compressive load, the stress induced in the wire is ___.
none in the list
The effect of stress raiser in compression is __.
negligible
For a solid circular cross-section, the radius of gyration is___.
d/4
A connecting rod is considered like __ for buckling about Y-axis.
both ends fixed
Common application of Eye bolts is in
absorbing shocks and vibrations
It is a cylindrical rod having a head at one end and fitted with a nut at the other end
Tap bolt
Wahl’s factor is related to the spring index, such that it ___, as the spring index decreases.
Increases very rapidly
The angle of twist of shaft is inversely proportional to (shaft diameter)
4
It is a cylindrical rod having a head at one end and fitted with a nut at the other end
imaginary
A saddle key __ power through frictional resistance only.
Transmits
It is a key that is tapered and fits in a keyway in the hub and is flat on the shaft.
Flat saddle key
The inclined member carrying compressive loads is __.
Strut
The buckling load will be maximum for a column, if
Both ends of the column are clamped
The direct stress induced in a long column is………….. as compared to bending stress.
Negligible
A kind of thread in which the width of the thread is approximately equal to its depth and the space between the threads is uniform
Square
Which is correct for hollow saddle key?
the curved surface of the shaft
This form of screw thread is a modification of square thread and has rounded top and bottom
American
It is the slanted distance between the crest and the root of a single-start thread.
Flank
This type of sunk key having uniform cross section throughout and taperless is used where the pulley, gear or other mating piece is required to slide along the shaft
parallel sunk
A screw is said to be self -locking screw, if its efficiency is ___
less than 50%
It is the distance measured normal to the bolt axis which is the shortest straight distance between the crest and the root of a single thread.
depth of thread
Two shafts A and B of solid circular cross-section are identical except for their diameters dA and dB. The ratio of power transmitted by the shaft A to that of shaft B is ___.
(dA)3/ (dB)3
Which of the following statements is true?
Shafts transmit power while axles do not transmit power.
This type of end connection for compression helical spring can best minimize if not eliminate the possibility of eccentric application of load.
squared and ground ends
A column that fails due to direct stress, is called.
short column
It is the locus of a point on a straight line which rolls, without slipping, on the circumference of a circle, or alternatively the locus of a point on the chord which is held tauted and unwound from a cylinder.
involute
