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Machine Design

Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

10 microns
0.01 micron
1 micron
0.1 micron

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(WD/ πd3) × K
(2WD/ πd3) × K
(4WD/ πd3) × K
(8WD/ πd3) × K

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Machine Design
The width of the pulley should be __________ width of the belt.

None of these
Greater than
Equal to
Less than

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Machine Design
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

10 N-m
5 N-m
7 N-m
15 N-m

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Machine Design
Which of the following cotter joint will be used to connect strap end of a connecting rod?

Gib and cotter joint
Any one of these
Sleeve and cotter joint
Spigot and socket cotter joint

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Machine Design
The design of the pressure vessel is based on

Longitudinal stress
Longitudinal and hoop stress
Hoop stress
None of these

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