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Machine Design

Machine Design
The efficiency of a riveted joint is equal to

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

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

6 kN/m
12 kN/m
30 kN/m
24 kN/m

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Machine Design
The ratio of the ultimate stress to the design stress is known as

Elastic limit
Strain
Factor of safety
Bulk modulus

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Machine Design
The bending stress in a curved beam is

Zero at the centroidal axis
Maximum at the neutral axis
None of these
Zero at the point other than centroidal axis

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Machine Design
Shaft coupling is used in machinery to

All of these
Introduce mechanical flexibility
Reduce the transmission of shock loads
Introduce protection against over loads

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Machine Design
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

log (T₁/T₂) = μθ
T₁/T₂ = μθ
T₁/T₂ =eμθ
T₁/T₂ = log μθ

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