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Machine Design

Machine Design
Euler’s formula for a mild steel column is not valid if the slenderness ratio is

90
60
100
120

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Machine Design
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

2 kN-m
3 kN-m
1 kN-m
4 kN-m

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

None of these
Smaller
Medium
Greater

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Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum principal stress theory
Maximum strain energy theory
Maximum distortion energy theory
Maximum shear stress theory

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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
BSW
Buttress
Acme

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Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A combination of torsional shear stress and bending
Direct shear stress only
Bending stress only
A combination of bending stress and direct shear stress

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