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CORREL > Machine Design 1 (Terms OT 2) > Flashcards

Machine Design 1 (Terms OT 2) Flashcards

1
Q

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

A

Malleability

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2
Q

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

A

None of the listed

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3
Q

A load that is applied at some initial velocity

A

Impact load

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4
Q

Modulus of rigidity is the ratio of

A

Shear stress and shear strain

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5
Q

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

A

Torsional Strength

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6
Q

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

A

Plasticity

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7
Q

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.

A

Elasticity

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8
Q

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

A

linear strain

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9
Q

If a material expands freely due to heating it will develop

A

No stress

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10
Q

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

A

Hardness

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11
Q

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

A

Strain

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12
Q

It is the energy stored by a body undergoing deformation.

A

Strain energy

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13
Q

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

A

Goodman

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14
Q

Which pressure vessel is strongest?

A

Spherical vessel

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15
Q

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

A

Double

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16
Q

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

A

0.5

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17
Q

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

A

Variable conditions

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18
Q

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

A

Decrease

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19
Q

The longitudinal stress is ___ of the circumferential stress.

A

One-half

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20
Q

This type of thread is common in mechanical jack

A

square thread

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21
Q

The common type of thread for bench vise is

A

Buttress

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22
Q

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

A

ACME Thread

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23
Q

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

A

completely reversed load

24
Q

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

A

longitudinal and girth stresses

25
Q

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

A

Pitch diameter

26
Q

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

A

Quadruple

27
Q

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

A

ACME thread

28
Q

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

A

BA thread

29
Q

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 _.

A

Soderberg line

30
Q

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

A

none in the list

31
Q

The effect of stress raiser in compression is __.

A

negligible

32
Q

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

A

d/4

33
Q

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

A

both ends fixed

34
Q

Common application of Eye bolts is in

A

absorbing shocks and vibrations

35
Q

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

A

Tap bolt

36
Q

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

A

Increases very rapidly

37
Q

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

A

4

38
Q

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

A

imaginary

39
Q

A saddle key __ power through frictional resistance only.

A

Transmits

40
Q

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

A

Flat saddle key

41
Q

The inclined member carrying compressive loads is __.

A

Strut

42
Q

The buckling load will be maximum for a column, if

A

Both ends of the column are clamped

43
Q

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

A

Negligible

44
Q

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

A

Square

45
Q

Which is correct for hollow saddle key?

A

the curved surface of the shaft

46
Q

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

A

American

47
Q

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

A

Flank

48
Q

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

A

parallel sunk

49
Q

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

A

less than 50%

50
Q

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.

A

depth of thread

51
Q

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 ___.

A

(dA)3/ (dB)3

52
Q

Which of the following statements is true?

A

Shafts transmit power while axles do not transmit power.

53
Q

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

A

squared and ground ends

54
Q

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

A

short column

55
Q

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.

A

involute

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