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問題一覧
1
Which of the following is not true for an instant center or centro of planar linkages?
Centro is a point in one body about which another body does tend to rotate.
2
The size to which a limit of deviations is assigned and is the same for both members of the fit, it is the exact theoretical size.
Basic size
3
The property of a material that measures the degree of plastic deformation sustained at fracture.
Ductility
4
The opposite of clearance, for mating cylindrical parts in which the internal member is larger than the external member
Interference
5
The combination of two or more materials, usually consisting of fiber and thermosetting polymer.
Composite materials
6
A machining operation for all types of metallic and nonmetallic materials and is capable of producing circular parts with straight or various profiles
Turning
7
A lubrication where the load-carrying surfaces of the bearing are separated by a relatively thick film of lubricant, so as to prevent metal to metal contact, and where the stability of the film can be explained by the laws of fluid mechanics.
Hydrodynamic lubrication
8
A journal bearing where the radius of the journal is less than the radius of the bushing or bearing.
Clearance journal bearing
9
A failure prediction theory, which states that a part subjected to any combination of loads, will fail (by yielding and fracturing) whenever the maximum shear stress exceeds a critical value.
Maximum-shear-stress theory
10
The most common work holding devices of a shaper machine with the base graduated in degrees that make it possible to swivel any angle.
Shaper vise
11
A speed at which rotating shaft becomes dynamically unstable.
Critical Speed
12
“For planar four bar linkage, the sum of the shortest and the longest lengths cannot be greater than the sum of the remaining two links” lengths if there is to be a continuous relative rotation between the two member” The preceding statement is known as:
Grashof’s law
13
The ability of the material to absorb energy up to fracture.
Toughness
14
It is defined as synergistic collection of machine elements; synergistic because as a design it represents an idea or concept greater than the sum of the individual parts.
Mechanical system
15
A set of specification for the analysis, design, manufacture, and construction of something; the purpose of which is to achieve a specified degree of safety, efficiency, and performance or quality.
Code
16
Either the upper of the lower deviation, depending on which is closer to the basic size.
Fundamental deviation
17
The trade name for a patented alloy made up chiefly of cobalt, chromium, and tungsten varying proportions.
Stellite
18
It is a load applied transversely to longitudinal axis of member.
Bending load
19
A ball bearing with race containing pronounced groove for rolling elements.
Conrad bearing
20
A machining process for producing internal straight cylindrical surface or profiles, with process characteristics and tooling similar to those for turning operations.
Boring
21
Shaper operation which is shaping the given stock and having the excess material remain with a tolerable allowance for finishing.
Roughing
22
A sketch of a machine, a machine element, or part of a machine element that shows all acting forces, such as applied load and gravity forces, and all reactive forces.
Free body diagram
23
A set of specification for parts, materials, or processes intended to achieve uniformity, efficiency, and a specified quality.
Standard
24
It is a load applied transversely to longitudinal axis of member.
Bending load
25
A failure prediction theory in which failure is caused by the elastic energy associated with shear deformation.
Distorsion-energy theory
26
The algebraic difference between the minimum limit and the corresponding basic.
Fundamental deviation
27
A material having different properties in all directions at point in solid.
Anisotropic material
28
A principal or method that a deflection at any point in bar is equal to sum f deflection caused by each load acting separately.
Method of superposition
29
Compounds of metallic elements, most frequently oxides, nitrides, and carbides.
Ceramics
30
A theorem stating that “when a body is elastically deformed by a system of loads, the deflection at any point p in any direction a is equal to the partial derivatives of the strain energy (with the system of loads acting) with respect to a load at p in the direction a”.
Castigliano’s Theorem
31
It is the strain energy per unit volume required to stress a material from an unloaded state to the point of yielding.
Modulus of resilience
32
The minimum stated clearance or the maximum stated interference for mating parts.
Allowance
33
A material having different properties in three mutually perpendicular directions at point in solid and having three mutually perpendicular planes of material symmetry
Orthotropic material
34
It is a combination of mechanisms and other components that transform, transmits, or uses energy, load, or motion for a specific purpose.
Machine
35
It is the intensity and direction of internal force acting at given point on particular plane.
Stress
36
A Grashof four-bar mechanism in which the shorted link is the frame or the fixed link and the other two cranks completely rotate with their axes.
Drank link mechanism
37
In a straight bevel gear, the angle between an element of the pitch cone and an element of the face cone is called:
Addendum angle
38
It is the intensity and direction of internal force acting at a given point on particular plane.
Stress
39
It is the capacity of a material to absorb energy when it is deformed elasticity and then, upon unloading, to release this energy.
Resilience
40
A machining process for producing internal straight cylindrical surface or profiles, with process characteristics and tooling similar to those for turning operations.
Boring
41
An American nonprofit society, founded in 1921, whose objectives are to improve and advance the use of fabricated structural stress.
American Iron Steel Institute (AISI)
42
The Maximum Shear Stress Theory, as a failure prediction theory, is also known as:
Tresca yield criterion
43
A lubrication where the load-carrying surfaces of the bearing are separated by a relatively thick film of lubricant, so as to prevent metal to metal contact, and where the stability of the film can be explained by the laws of fluid mechanics.
Hydrodynamic lubrication
44
A failure prediction theory, which states that a part subjected to any combination of loads, will fail (by yielding or fracturing) whenever the maximum shear stress exceeds a critical value.
Maximim-shear-stress theory
45
A lubrication condition where non-conformal surfaces are completely separated by lubricant film and no asperities are in contact.
Elastohydrodynamic lubrication
46
A machining operation for all types of metallic and nonmetallic materials and is capable of producing circular parts with straight of various profiles.
Turning
47
The ability of the material to absorb energy up to the fracture.
Toughness
48
The transformation of concepts and ideas into useful machinery is called as:
Design
49
A general term that refers to the mating of cylindrical parts such as bolt or a hole; it is used only when the internal member is smaller that the external member.
Clearance
50
A cutting tool that has two or more cutting edges as in drill presses and milling machine cutters.
Multi-point cutting tool
51
It may be defined the displacement per length produced in a solid as the result of stress.
Strain
52
It is the capacity of a material to absorb energy when it is deformed elastically and then, upon unloading, to release this energy
Resilience
53
It is the strain energy per unit volume required to stress a material from an unloaded state to the point of yielding.
Modulus of resilience
54
A speed at which rotating shaft becomes dynamic unstable.
Critical speed
55
It may be define the displacement per length produced in a solid as a result of stress.
Strain
56
The algebraic difference between the maximum limit and the corresponding basic.
Upper Deviation
57
It is defined as synergistic collection of machine elements; synergistic because as a design it represents an idea or concept greater than the sum of the individual parts.
Mechanical system
58
The algebraic difference between a size and the corresponding basic size.
Allowance
59
The stated maximum and minimum dimensions.
Limits
60
A journal bearing where the radius of the journal is less than the radius of the bushing or bearing.
Clearance journal bearing
61
The combination of applied normal and shear stresses that produces maximum principal normal stress, with a third principal stress between or equivalent to the extremes.
Bending and shear stress
62
The combination of applied normal and shear stresses that produces maximum principal normal stress, with a third principal stress between or equivalent to the extremes
Bending and shear stress
63
A four bar mechanism in which one of the links can perform a full rotation relative to the other three links.
Grashof mechanism
64
A lubrication condition where non-conformal surfaces are completely separated by lubricant film and no asperities are in contact.
Elastohydrodynamic lubrication
65
The difference between the maximum and minimum size limits of a part.
Tolerance
66
A ball bearing with race contacting pronounced groove for rolling elements.
Conrad bearing
67
A theory in a cyclic and impact loading, which states that damage at any stress level is proportional ro the number of cycles.
Miner’s rule
68
The Maximum Shear Stress Theory, as a failure prediction theory, is also known as:
Tresca yield criterion
69
A theory in cyclic and impact loading, which states that damage at any stress level is proportional to the number of cycles.
Mine’s rule