Mach Design Exam final UPDATED ACTUAL Questions and CORRECT Answers
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Course
Mach Design
Institution
Mach Design
Mach Design Exam final UPDATED
ACTUAL Questions and CORRECT
Answers
Grade 1 bolts have higher strength than grade 8 bolts. - CORRECT ANSWER- False
If the stiffness constant of a joint C is equal to .25, which statement is true - CORRECT
ANSWER- The bolt will take 25% of the applied load
Mach Design Exam final UPDATED
ACTUAL Questions and CORRECT
Answers
Grade 1 bolts have higher strength than grade 8 bolts. - CORRECT ANSWER✔✔- False
If the stiffness constant of a joint C is equal to .25, which statement is true - CORRECT
ANSWER✔✔- The bolt will take 25% of the applied load
In order to support a radial load the journal in a journal bearing will not be concentric to the
bearing. - CORRECT ANSWER✔✔- true
Measuring the elongation of a bolt with calipers is one method of determining the bolt's
preload. - CORRECT ANSWER✔✔- true
Petroff's equation can be used to estimate friction in a journal bearing, with the limitation that
it is based on concentricity of the journal and bearing. - CORRECT ANSWER✔✔- true
The C-o (static load rating) value is used when a bearing is subjected to axial loading -
CORRECT ANSWER✔✔- true
The proof strength of a bolt is the value to which it should be preloaded. - CORRECT
ANSWER✔✔- false
The threaded and unthreaded portions of a bolt can be modeled as springs in parallel. -
CORRECT ANSWER✔✔- false
Trumpler's criterion for the design of a journal bearing specifies the recommended minimum
value of what parameter? - CORRECT ANSWER✔✔- film thinkness
What does the tabulated value C (or C-10) represent? - CORRECT ANSWER✔✔- The
radial load at which 10% are expected to fail after 1 million cycles
, When a gasket is used, the percentage of the applied load resisted by the bolt is decreased. -
CORRECT ANSWER✔✔- false
When plotting the applied radial lod versus the bearing life, what type of axes produce a
straight line? - CORRECT ANSWER✔✔- log-log
When selecting a bearing for combined radial and axial loading, the procedure is iterative. -
CORRECT ANSWER✔✔- true
Which of these factors is NOT included in the calculation of the Summerfeld number of a
journal bearing?
Radial clearance
Viscosity
Flow rate of the oil
Rotational speed - CORRECT ANSWER✔✔- flow rate of the oil
Which type of distribution of failure percentage versus life is the best fit for the failure of
rolling-element bearings? - CORRECT ANSWER✔✔- weibull
The bergstasser factor Kb modifies the shear stress due to torsion in a spring to account for
what factor - CORRECT ANSWER✔✔- curvature and direct shear
Which of these describes the process of set removal for a compression spring - CORRECT
ANSWER✔✔- making it over-length and compressioning it to induce beneficial residual
stresses
shot peening is performed in order to improve a spring's fatigue strength - CORRECT
ANSWER✔✔- true
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