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ProblemSet3MDpart2
  • MandJ Clothing

  • 問題数 100 • 11/11/2023

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    問題一覧

  • 1

    In a specification schedule is used when the pipe specified as "schedule 80", the pipe corresponds to the

    allowable stress

  • 2

    The modulus of elasticity for ordinary steel usually falls between _____ million pounds per square inch.

    28 to 31

  • 3

    The modulus of elasticity is a measure of

    stiffness

  • 4

    The modulus of elasticity for most metals in compression is usually taken as that in

    tension

  • 5

    The ratio of moment and stress is called

    section modulus

  • 6

    For a symmetrical cross-section beam the flexural stress is ____when the vertical shear is maximum.

    zero

  • 7

    When tested in compression, ductile materials usually exhibit characteristics up to the yield strength as they do when tested in tension.

    approximately the same

  • 8

    It has been said that 80% of the failures of machine parts have been

    fatigue failures

  • 9

    Cazand quotes values for steel showing Sn/Su ratios, often called endurance ratio, from

    0.23 to 0.65

  • 10

    The discontinuity or change of section, such as scratches, holes, bends, or grooves is a

    stress raiser

  • 11

    The degree of stress concentration is usually indicated by a

    stress concentration factor

  • 12

    In a part at uniform temperature and not acted upon by an external load, any internal stresses that exist.

    Residual stress

  • 13

    The stress or load induced by the tightening operation.

    Initial stress

  • 14

    A type of failure due to instability is known as

    buckling

  • 15

    The ratio of the length of the column and the radius of gyration of the cross-sectional area about a centroidal axis.

    Slenderness ratio

  • 16

    Formula that applies to a very slender column is called:

    Euler's formula

  • 17

    If two principal stress is zero, the state stress is

    uniaxial

  • 18

    If one principal stress is zero, the state stress is

    biaxial

  • 19

    If all the principal stresses have finite values, the system is

    triaxial

  • 20

    Under theories of failure for static loading of ductile material, the design stress is the

    yield stress/factor of safety

  • 21

    Under theories of failure, the value of shear stress that of tensile stress.

    half

  • 22

    The theory of mechanics of materials shows that the results from the octahedral shear stress theory and those from the maximum distortion energy theory are.

    the same

  • 23

    A kind of stress that is caused by forces acting along or parallel to the area.

    Shearing stress

  • 24

    Obtained by dividing the differential load dF by the dA over which it acts.

    Stress

  • 25

    The highest ordinate in the stress strain diagram or curve is called

    ultimate strength

  • 26

    A pair of forces equal in magnitude opposite in direction, and not in the same line.

    Couple

  • 27

    Framework composed of members joined at their ends to form a rigid structure is known as

    truss

  • 28

    The ratio of the tensile stress to the tensile strain is called

    Young modulus

  • 29

    The ratio of the volume stress to the volume strain is called the coefficient of volume elasticity or

    bulk modulus

  • 30

    The action of a force is characterized by

    its magnitude

  • 31

    At highest or lowest point on the moment diagram

    shear is zero

  • 32

    The built-in or fixed support is capable of supporting

    an axial load

  • 33

    The modulus of elasticity in shear is commonly called

    modulus of rigidity

  • 34

    The stress beyond which the material will not return to its original shape when unloaded, but will retain a permanent deformation.

    Elastic limit

  • 35

    Refers to the actual stress the material has when under load is known as

    working stress

  • 36

    The safe soil bearing pressure of diesel engine is about

    4890 kg per sq. cm

  • 37

    The machine foundation must have a factor of safety of

    5

  • 38

    The load acts over smaller area, and the ______ continues to increase unit failure.

    actual stress

  • 39

    In the stress-strain diagram where there is a large increase in strain with little or no increase in stress.

    Yield strength

  • 40

    A member that carries loads transverse to its axis.

    Beam

  • 41

    Which type of load that is applied slowly and is never removed?

    Static load

  • 42

    When varying loads are applied that are not regular in their amplitude, the loading is called

    Random loading

  • 43

    A measure of the relative safety of a load-carrying component is termed as

    design factor

  • 44

    The condition, which causes actual stresses in machine members to be higher than nominal values predicted by the elementary direct and combined stress equations.

    Stress concentration

  • 45

    The stress value, which is used, in the mathematical determination of the required size of the machine member.

    Design stress

  • 46

    Typical values for Poisson's ratio of cast iron is in the range of

    0.25 to 0.27

  • 47

    Typical values for Poisson's ratio of steel is in the range of

    0.27 to 0.30

  • 48

    Typical values for Poisson's ratio of aluminum and titanium is in the range of

    0.30 to 0.33

  • 49

    The angle of inclination of the planes on which the principal stresses act is called

    principal plane

  • 50

    It provides a very accurate prediction of failure of ductile materials under static loads or completely reversed normal, shear or combined stresses.

    Distortion energy theory

  • 51

    Torsional deflection is a significant consideration in the design of shaft and the limit should be in the range of ____ degrees/foot of length.

    0.08 to 1

  • 52

    For a universal joint shaft angle should be _____ degrees maximum and much less if in high rotational speed.

    15

  • 53

    It is a good design practice for steel line shafting to consider a limit to the linear deflection ____ of inch/foot length maximum.

    0.010

  • 54

    It is a rotating machine member that transmits power.

    Shaft

  • 55

    A stationary member carrying pulleys, wheels and etc. that transmit power.

    Axle

  • 56

    A line shaft is also known as

    main shaft

  • 57

    Which of the following shaft intermediate between a line shaft and a driven shaft?

    All of the above

  • 58

    Short shafts on machines are called

    spindles

  • 59

    For shafts, the shear due to bending is a maximum at the neutral plane where the normal stress is

    zero

  • 60

    Criteria for the limiting torsional deflection vary from 0.08 per foot of length for machinery shafts to ____per foot

  • 61

    For transmission shafts the allowable deflection is one degree in a length of ________diameters.

    20

  • 62

    An old rule of thumb for transmission shafting is that the deflection should not exceed _____ of length between supports.

    0.01 in. per foot

  • 63

    In general for machinery shafts, the permissible deflection may be closer to

    0.002 in/ft

  • 64

    The speed at which the center of mass will equal the deflecting forces on the shaft with its attached bodies will then vibrate violently, since the centrifugal force changes its direction as the shaft turns.

    Critical speed

  • 65

    For shaft, the minimum value of numerical combined shock and fatigue factor to be applied in every case to the computed bending moment is

    1.5

  • 66

    It is suggested that the design factor on the yield strength be about 1.5 for the smooth load, about 2 to 2.25 for minor shock loads, and _____ when the loading reverses during operation.

    4.5

  • 67

    A column is called short column when

    the length is less than 8 times the diameter

  • 68

    For a circular shaft subjected to torque the value of shear stress

    is zero at the axis and linearly increases to a maximum value at the surface of the shaft

  • 69

    The compression members tend to buckle in the direction of

    least radius of gyration

  • 70

    A reinforced concrete beam is considered to be made up of

    heterogeneous material

  • 71

    The column splice is used for increasing

    length of the column

  • 72

    A simply supported beam has a uniformly distributed load on it, the bending moment is

    parabola

  • 73

    The power obtained by piston reaches flywheel through the

    crank shaft

  • 74

    There are two types of crankshafts

    single piece and built up

  • 75

    Engine valves get open by means of

    cam shaft

  • 76

    The ____ value of allowable stresses are generally used in practice for main transmitting shafts.

    282 kg/cm²

  • 77

    The value of allowable stresses are generally, used in practice for line shafts carrying pulleys.

    423 kg/cm²

  • 78

    The ____ value of allowable stresses are generally used in practice for small, short shafts, countershafts.

    599 kg/cm²

  • 79

    Torsional deformation in transmission shafts should be limited to____ in 20 diameters.

  • 80

    Lateral deflection caused by bending should not exceed

    0.01 in. per foot of length

  • 81

    Front axle should be live and

    dead

  • 82

    The steering is coupled to the two front wheels by means of a

    tie rod

  • 83

    In the overdrive transmission system the rotation speed____ rest higher than that of engine's speed.

    propeller shaft

  • 84

    A slip joint the length of propeller shaft.

    keeps appropriate

  • 85

    The transmission system incorporates clutch, gear box, and propeller shaft and

    differential

  • 86

    The lay shaft moves _____ the primary shaft.

    in the gear ratio

  • 87

    The main shaft is lifted ____the lay shaft.

    parallel to

  • 88

    In the top gear, the rotational speeds of _____ remain the same.

    primary and main shafts

  • 89

    The primary and lay shafts rotate in ____ direction

    reverse

  • 90

    It is an integral part of the machine

    Machine shaft

  • 91

    Stresses in shafts are analyzed through

    all of these

  • 92

    Standard stock length is

    all of the above

  • 93

    Centrifugal separators that operate at ____ speeds also employ these flexible shafts.

    20,000 to 50,000 rpm

  • 94

    Which of the following material is used for shafting?

    AISI 3240

  • 95

    The process of redistributing the mass attached to a rotating body in order to reduce arising from a centrifugal force

    Shaft balancing

  • 96

    In many cases the ___ of the shaft is an import design feature.

    rigidity

  • 97

    Commercial shafting is made of

    low carbon steel

  • 98

    The most common material for shafting is A. B. C.

    mild steel

  • 99

    Gold drawing produces a ____ shaft ----- but with higher residual stresses

    stronger

  • 100

    Allowable stresses in shear equal to _____ with common in design of a shaft

    5000 to 8000 psi