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Machine Design

Machine Design
The pitch of threads on a Jock nut in comparison to pitch of nut is

Coarser
Same
Finer
Very fine

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Machine Design
The strap end of a connecting rod of steam engine is joined by

Spigot socket cotter joint
Sleeve and cotter joint
Gib of cotter joint
Knuckle joint

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

Rectangular
Elliptical
I-section
Any one of these

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Machine Design
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

One end fixed and the other end free
Both the ends fixed
One end fixed and the other end hinged
Both the ends hinged

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Machine Design
Belt slip may occur due to

Heavy load
Driving pulley too small
Loose belt
All of these

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° - φ
45° - φ/2
90° - φ
45° + φ/2

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