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Machine Design

Machine Design
Applications in which stresses are encountered in one direction only uses following type of threads

Acme
Metric
Square
Buttress

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Machine Design
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

Right hand
None of these
Both A and B
Left hand

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Machine Design
Belt slip may occur due to

All of these
Loose belt
Driving pulley too small
Heavy load

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Machine Design
The following type of nut is used with alien bolt

Slotted nut
Hexagonal nut
Any one of the above
Castle nut

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Machine Design
The cross-section of the arm of a bell crank lever is

Rectangular
Elliptical
Any one of these
I-section

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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

τ/2
4 τ
τ
2 τ

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