Machine Design
Turn buckle has

Left hand threads on both ends
No threads
Left hand threads on one end and right hand threads on other end
Right hand threads on bout ends

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Machine Design
A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

There are five rivets per pitch length, out of which four are in double shear and one is in single shear
There are four rivets per pitch length, all in double shear
There are four rivets per pitch length, out of which two are in single shear and two are in double shear
There are five rivets per pitch length, all in double shear

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Machine Design
The creep in the belt is due to

Stresses beyond elastic limit of belt material
Unequal extensions in the belt due to tight and slack side tensions
Effect of temperature on belt
Material of belt

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Machine Design
Stress concentration is caused due to

Pitting at points or areas at which loads on a member are applied
Abrupt change of section
All of these
Variation in properties of material from point to point in a member

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