Machine Design 1 (Terms OT 2)

Question 1

The property of a material by virtue of which it can be beaten or rolled into plates is called

Answer 1

Malleability

Question 2

It is defined as the stress developed in the material without any permanent set.

Answer 2

None of the listed

Question 3

A load that is applied at some initial velocity

Answer 3

Impact load

Question 4

Modulus of rigidity is the ratio of

Answer 4

Shear stress and shear strain

Question 5

What is the metal characteristic to withstand forces that cause twisting?

Answer 5

Torsional Strength

Question 6

It is the ability of a material to be deformed considerably without rupture.

Answer 6

Plasticity

Question 7

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.

Answer 7

Elasticity

Question 8

Deformation per unit length in the direction of force is known as

Answer 8

linear strain

Question 9

If a material expands freely due to heating it will develop

Answer 9

No stress

Question 10

The resistance of a material to indentation by a penetrator is an indication of its

Answer 10

Hardness

Question 11

The maximum energy that can be stored in a body due to external loading up to the elastic limit is called

Answer 11

Strain

Question 12

It is the energy stored by a body undergoing deformation.

Answer 12

Strain energy

Question 13

Which failure criterion is applicable when failure criterion is not assumed and the mean stress and alternating stress are non-zero?

Answer 13

Goodman

Question 14

Which pressure vessel is strongest?

Answer 14

Spherical vessel

Question 15

The stress in the bar when load is applied suddenly is ___ as compared to the stress induced due to gradually applied load.

Answer 15

Double

Question 16

When a material is subjected to fatigue loading, the ratio of its ultimate tensile strength to its endurance limit is __

Answer 16

0.5

Question 17

The endurance or fatigue strength may be defined as the maximum safe stress which can be applied to a machine member under_

Answer 17

Variable conditions

Question 18

If the size of a standard specimen for a fatigue testing machine is increased, the endurance strength of the material will ___.

Answer 18

Decrease

Question 19

The longitudinal stress is ___ of the circumferential stress.

Answer 19

One-half

Question 20

This type of thread is common in mechanical jack

Answer 20

square thread

Question 21

The common type of thread for bench vise is

Answer 21

Buttress

Question 22

Which form of thread has an included angle between the flanks of thread of 29 degrees?

Answer 22

ACME Thread

Question 23

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

Answer 23

completely reversed load

Question 24

The design of the thin-walled pressure vessel is based on ___.

Answer 24

longitudinal and girth stresses

Question 25

Which of the following cannot be measured directly by precision instruments?

Answer 25

Pitch diameter

Question 26

When helical compression spring is cut into quarters, the stiffness of the resulting spring will be

Answer 26

Quadruple

Question 27

What form of thread is suitable for lead screws of machine tools?

Answer 27

ACME thread

Question 28

This type of threads is suitable for small precision components and measuring gauges.

Answer 28

BA thread

Question 29

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 _.

Answer 29

Soderberg line

Question 30

When a helical compression spring is subjected to an axial compressive load, the stress induced in the wire is ___.

Answer 30

none in the list

Question 31

The effect of stress raiser in compression is __.

Answer 31

negligible

Question 32

For a solid circular cross-section, the radius of gyration is___.

Answer 32

d/4

Question 33

A connecting rod is considered like __ for buckling about Y-axis.

Answer 33

both ends fixed

Question 34

Common application of Eye bolts is in

Answer 34

absorbing shocks and vibrations

Question 35

It is a cylindrical rod having a head at one end and fitted with a nut at the other end

Answer 35

Tap bolt

Question 36

Wahl’s factor is related to the spring index, such that it ___, as the spring index decreases.

Answer 36

Increases very rapidly

Question 37

The angle of twist of shaft is inversely proportional to (shaft diameter)

Answer 37

4

Question 38

It is a cylindrical rod having a head at one end and fitted with a nut at the other end

Answer 38

imaginary

Question 39

A saddle key __ power through frictional resistance only.

Answer 39

Transmits

Question 40

It is a key that is tapered and fits in a keyway in the hub and is flat on the shaft.

Answer 40

Flat saddle key

Question 41

The inclined member carrying compressive loads is __.

Answer 41

Strut

Question 42

The buckling load will be maximum for a column, if

Answer 42

Both ends of the column are clamped

Question 43

The direct stress induced in a long column is………….. as compared to bending stress.

Answer 43

Negligible

Question 44

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

Answer 44

Square

Question 45

Which is correct for hollow saddle key?

Answer 45

the curved surface of the shaft

Question 46

This form of screw thread is a modification of square thread and has rounded top and bottom

Answer 46

American

Question 47

It is the slanted distance between the crest and the root of a single-start thread.

Answer 47

Flank

Question 48

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

Answer 48

parallel sunk

Question 49

A screw is said to be self -locking screw, if its efficiency is ___

Answer 49

less than 50%

Question 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.

Answer 50

depth of thread

Question 51

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 ___.

Answer 51

(dA)3/ (dB)3

Question 52

Which of the following statements is true?

Answer 52

Shafts transmit power while axles do not transmit power.

Question 53

This type of end connection for compression helical spring can best minimize if not eliminate the possibility of eccentric application of load.

Answer 53

squared and ground ends

Question 54

A column that fails due to direct stress, is called.

Answer 54

short column

Question 55

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.

Answer 55

involute