Exercise: Machine Design

Questions for: Machine Design

In a steam engine, the valve rod is connected to an eccentric rod by means of
A:
cotter joint
B:
knuckle joint
C:
universal joint
D:
flange coupling
Answer: B
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The dedendum is the radial distance from the
A:
pitch circle to the top of a tooth
B:
pitch circle to the bottom of a tooth
C:
top of a tooth to the bottom of a tooth
D:
addendum circle to the clearance circle
Answer: B
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According to Rankine's theory, the failure occurs at a point in a member
A:
when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in a simple tension test
B:
when the maximum principal stress in a bi-axial stress system reaches the elastic limit of the material in a simple tension test
C:
when the strain energy per unit volume in a bi-axial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test
D:
when the maximum principal strain in a bi-axial stress system reaches the strain at the elastic limit as determined from a simple tension test
Answer: B
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The Wahl's stress factor (K) for springs is given by
(where )
A:
B:
C:
D:
Answer: D
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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:
static load
B:
dynamic load
C:
static as well as dynamic load
D:
completely reversed load
Answer: D
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