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Mechanics > Midterm Concepts > Flashcards

Midterm Concepts Flashcards

1
Q

The safe twisting moment for a compound shaft is equal to the ______

A

minimum calculated value

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2
Q

If equal and opposite forces applied to a body tend to elongate it, the stress so produced is called _______

A

tensile stress

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3
Q

The torsional rigidity of a shaft is expressed by the _______

A

torque required to produce a twist of one radian per unit length of shaft

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4
Q

The property of a material by virtue of which a body returns to its original shape after removal of the load is called _____

A

elasticity

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5
Q

The ratio of the ultimate stress to the allowable stress of the material is called _____

A

factor of safety

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6
Q

If the radius of wire stretched by a load is doubled, then its Young Modulus will be ____

A

remain unaffected

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7
Q

The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight _____

A

half the weight of bar applied at lower end

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8
Q

The actual stress that the material has when under load is called _____

A

working stress

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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 force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder, this stress is called:

A

hoop stress

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11
Q

Shearing stress is also known as:

A

tangential stress

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12
Q

Shear stress induced in a shaft subjected to tension will be:

A

not uniform

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13
Q

A shearing stress acting on a body changes its:

A

shape

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14
Q

A cylindrical tank is considered to be thin walled if its diameter is more than _____ times the wall thickness

A

10

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15
Q

Stress caused by forces acting along or parallel to the area resisting the forces is known as:

A

shearing stress

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16
Q

A metal wire is stretched along its length. Another identical wire is heated. The resultant length of two wires is the same. What can be said about the diameters of the two wires?

A

the hot wire has a larger diameter than the stretched wire

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17
Q

A spring is stretched by applying a load to its free end. The strain produced in the spring is:

A

longitudinal and shear

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18
Q

The maximum load a wire can withstand without breaking, when its length is reduced to half of its original length, will:

A

remain same

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19
Q

A physical quantity that has no dimension

A

strain

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20
Q

If the applied force on the object is such that it tends to decrease the length of an object then it is called:

A

compressive stress

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21
Q

It is known as the maximum allowable stress that material or object will be subjected to when in service

A

working stress

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22
Q

In a tensile test, when the material is stressed beyond the elastic limit, the tensile strain ______ as compared to the stress.

A

increases more quickly

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23
Q

The stress set up in the body, when a deforming force acts tangentially, is known as?

A

shearing stress

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24
Q

A shaft is said to be in pure torsion if:

A

two opposite turning moments are applied to the shaft

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25
Q

Which of the following is correct assumption made in the theory of torsion?

A

the twisting couple acts in the traverse plane only

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26
Q

Unit of Torsional Rigidity

A

N-mm^2

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27
Q

Pure torsion of a shaft produces:

A

a longitudinal shear stress and a circumferential shear stress on a surface element of a shaft

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28
Q

In solid shaft, stress at the center is:

A

zero

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29
Q

A hollow shaft of same cross-section area as solid shaft transmits:

A

more torque

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30
Q

For a circular shaft undergoing deformation due to a torsional force, what happens to length and radius of the shaft?

A

remain fixed

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31
Q

The shear stress at the center of a circular shaft under torsion is:

A

zero

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32
Q

The maximum shear stress occurs on the outermost fibers of a circular shaft under torsion. In a close coiled helical spring, the maximum shear stress occurs on the ______

A

innermost fibers

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33
Q

If a constant section beam is subjected to uniform bending moment throughout, it bends as -

A

a circular arc

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34
Q

The total area under the stress-strain curve of a mild steel specimen tested up to failure under tension is a measure of its:

A

toughness

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35
Q

What is shear modulus?

A

shear stress/ shear strain

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36
Q

According to Hooke’s law, stress is proportional to:

A

strain

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37
Q

If a part is constrained to move and heated, it will develop:

A

compressive stress

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38
Q

A material has identical properties in all directions, it is said to be:

A

isotropic

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39
Q

In a steam engine, the valve rod is connected by an eccentric rod by means of:

A

knuckle joint

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40
Q

If the hole’s width decreases in the direction of the load for an elliptical hole in a flat plate, the Stress Concentration Factor will:

A

increase

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41
Q

______ is defined as the maximum stress to which a material can be subjected without a fatigue failure, regardless the number of cycles

A

endurance limit

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42
Q

Which is not a method of alleviating stress concentration at the center of a stepped shaft?

A

providing fastener

43
Q

What is the value of fatigue notch sensitivity for a fully sensitive material?

A

1

44
Q

Stress concentration factor is defined as the ratio of:

A

maximum stress to the nominal stress

45
Q

A tension member of diameter d is designed with FOS of 3. If the load and diameter are doubled, FOS will be:

A

doubled

46
Q

Stress concentration in static loading having high influence in ______

A

brittle materials

47
Q

These are elements that are used as roller in roller bearings:

A

cylindrical, taper, and spherical

48
Q

The function of a washer is:

A

to provide a bearing area

49
Q

The lateral strain is known as

A

transverse strain

50
Q

What are the materials which show direction dependent properties, called?

A

anisotropic materials

51
Q

Which type of test on steel is done to obtain the graph of a stress-strain curve?

A

tensile test

52
Q

Hooke’s law holds good up to the limit of _______

A

proportionality

53
Q

Thermal stress is caused when the temperature of a body:

A

increase or decrease

54
Q

If a composite bar of steel and copper is heated, the copper bar will be under:

A

compression

55
Q

The ratio of circumferential stress to the longitudinal stress in the walls of a cylindrical shell, due to flowing liquid is:

A

2

56
Q

The design of thin cylindrical shells is based on:

A

hoop stress

57
Q

For cantilever beam, bending moment will be zero at:

A

free end

58
Q

In a beam, effect of bending stress is ______ effect of shear stress

A

greater than

59
Q

The load which is distributed uniformly over the length of the beam, then the load is called:

A

uniformly distributed load

60
Q

If length of the wire is doubled, then it can hold ________

A

the same maximum stress as before

61
Q

According to Hooke’s law, if stress is increased the ratio of stress to strain will ____

A

remain constant

62
Q

Young’s modulus is defined as the ratio of:

A

longitudinal stress and longitudinal strain

63
Q

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

A

linear strain

64
Q

The Young’s modulus of a wire is defined as the stress which will increase the length of wire compared to its original length:

A

same amount

65
Q

The intensity of stress which causes unit strain is called:

A

modulus of elasticity

66
Q

For steel, the ultimate strength in shear as compared to in tension is nearly:

A

half

67
Q

The property of a material which allows it to be drawn into a smaller section is called:

A

ductility

68
Q

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

A

malleability

69
Q

In a tensile test, near the elastic limit zone, the ______

A

tensile strain increases more quickly

70
Q

The stress necessary to initiate yielding is ______

A

considerably greater than that necessary to continue it

71
Q

In a tensile test, the phenomenon of slow extension of the material, i.e. stress increasing with the time at a constant load is called:

A

creeping

72
Q

The stress developed in a material at breaking point in extension is called:

A

breaking stress

73
Q

Rupture stress is:

A

load at breaking point

74
Q

The elasticity of various materials is controlled by its:

A

stress at elastic limit

75
Q

The stress at which extension of the material takes place more quickly as compared to the increase in load is called:

A

yielding point of the material

76
Q

The stress induced in a body due to suddenly applied load compared to when it is applied gradually is:

A

two times

77
Q

The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is:

A

four times

78
Q

In riveted boiler joints, all stresses, shearing, bearing, and tensile are based on the:

A

size of the drilled or reamed hole

79
Q

The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is:

A

half

80
Q

Longitudinal stress in a thin cylinder is:

A

half of the hoop stress

81
Q

The value of shear stress which is induced in the shaft due to the applied couple varies:

A

from zero at the center to maximum at the circumference

82
Q

For normal stress, the constant of proportionality is called:

A

modulus of elasticity

83
Q

A bar is said to be of uniform strength when:

A

the stress at any cross section of the bar is same

84
Q

What type of stress is produced whenever the applied load cause one section of a body to tend to slide past its adjacent section?

A

shearing stress

85
Q

If a uniform bar is supported at one end in a vertical position and loaded by its own weight, the maximum stress occurs at:

A

supported end

86
Q

For shear stress, the constant of proportionality is called:

A

modulus of rigidity

87
Q

The stress beyond which the material will not return to its original shape when unloaded is called:

A

elastic limit

88
Q

A vertically loaded beam, fixed at one end and simply supported at the other is indeterminate to what degree?

A

first

89
Q

A material with a high value of modulus of elasticity is:

A

hard

90
Q

It describes the length elasticity of the materials

A

young’s modulus

91
Q

Who introduced the modulus of elasticity in 1807

A

thomas Young

92
Q

The fractional deformation resulting from a stress

A

strain

93
Q

As soon as the external forces causing deformation in a perfectly elastic body are withdrawn, the elastic deformation disappears:

A

completely and instantaneously

94
Q

If all the dimensions of a vertically suspended circular bar are doubled, then the maximum stress produced in it due to its own weight will:

A

be doubled

95
Q

The weight of all non-permanent objects, including people and furniture, in the structure.

A

live load

96
Q

The ability of material to absorb a large amount of energy is:

A

toughness

97
Q

Stress caused by forces perpendicular to the areas on which they act is called:

A

normal force

98
Q

The highest ordinate on the stress-strain curve is:

A

ultimate strength

99
Q

It is inert, inactive load, primarily due to the structure’s own weight

A

dead load

100
Q

The maximum safe stress a material may carry is called:

A

allowable stress

101
Q

The property of metals that allows them to be drawn into wires

A

malleability

102
Q

If all the dimensions of a vertically suspended circular bar are doubled and cross sectional area is made half, the maximum change in length due to its own weight will:

A

be four times

103
Q

Solids which break above the elastic limit are called:

A

brittle

104
Q

The condition under which the stress is constant or uniform is known as:

A

simple stress

Mechanics (10 decks)

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