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Machine Design

Machine Design
A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.

Medium
None of these
Smaller
Greater

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

2840 d
2080 d
1680 d
1420 d

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kt + 1)/ (Kf + 1)
(Kf + 1)/ (Kt + 1)
(Kf - 1)/ (Kt - 1)
(Kt - 1)/ (Kf - 1)

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Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

90°
67.5°
22.5°
45°

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

1 micron
10 microns
0.1 micron
0.01 micron

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

Compressive stress
Bending stress
Tensile stress
Shear stress

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