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Machine Design

Machine Design
The efficiency of a riveted joint is equal to

Pc /P
Ps /P
Pt /P
Least of Pt, Ps and Pc/P

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Machine Design
The ratio of driving tensions in V-belt drives is __________ flat belt drives.

Equal to
sin α times more than
cosec α times more than
sin α times less than

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ k₂)/ (k₁ + k₂)
(k₁ + k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ + k₂)

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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

2.8
3.5
3.0
2.5

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Machine Design
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

Eight times
Four times
Twice
Sixteen times

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Machine Design
The rated life of a bearing varies

Inversely as square of load
Inversely as cube of load
Directly as load
Inversely as fourth power of load

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