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Machine Design

Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

4 d
5 d
3 d
2 d

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Machine Design
A self locking screw has

Coefficient of friction is greater than tangent of load angle
Hole for inserting split pin
Fine threads
Course threads

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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

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

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Machine Design
When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as,

Worm gearing
Helical gearing
Bevel gearing
None of these

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Machine Design
The shear plane in case of bolts should

Be across threaded portion of shank
Be parallel to axis of bolt
Never be across the threaded portion
Be normal to threaded portion of shank

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Machine Design
The bending stress in a curved beam is

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

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