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Machine Design

Machine Design
The difference between the upper limit and lower limit of a dimension is called

Nominal size
Actual size
Tolerance
Basic size

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

3.5
3
2.8
2.5

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kf + 1)/ (Kt + 1)
(Kf - 1)/ (Kt - 1)
(Kt - 1)/ (Kf - 1)
(Kt + 1)/ (Kf + 1)

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Machine Design
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

F.P
F
P
F + P

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Machine Design
A sliding bearing which operates without any lubricant present, is called

Zero film bearing
Boundary lubricated bearing
Hydrostatic lubricated bearing
Hydrodynamic lubricated bearing

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

2 τ
4 τ
τ
τ/2

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