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Machine Design

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

Same
Finer
Very fine
Coarser

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Machine Design
A double strap butt joint (with equal straps) is

Always in single shear
Either in single shear or double shear
Any one of these
Always in double shear

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Machine Design
The coefficient of friction between the belt and pulley depends upon the

Speed of belt
All of these
Slip of belt
Material of belt and pulley

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Machine Design
Which of the following bearing is preferred for oscillating conditions?

Angular contact single row ball bearing
Taper roller bearing
Needle roller bearing
Double row roller bearing

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Machine Design
18/8 steel contains

18% chromium and 8% nickel
18% vanadium and 8% nickel
18% nickel and 8% vanadium
18% nickel and 8% chromium

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Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Decreases markedly
Increases markedly
Depends on heat treatment carried out
Remain same

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