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Machine Design

Machine Design
The taper on a rectangular sunk key is

1 in 32
1 in 48
1 in 16
1 in 100

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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
τ
τ/2
4 τ

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Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

ZN/p
N/Zp
p/ZN
Z/pN

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Machine Design
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

Square
Buttress
BSW
Acme

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Machine Design
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

4 times more
2 times more
Same in both cases
3 times more

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Machine Design
The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

Ductility
Plasticity
Elasticity
Malleability

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