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Machine Design

Machine Design
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

0.5 d
1.25 d
d
0.75 d

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/2σt
pd/4σt
pd/σt
pd/3σt

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Machine Design
The maximum efficiency of a square threaded screw is

(1 + sinφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + sinφ)
(1 + cosφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + cosφ)

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Machine Design
Which one of the following is a positive drive?

Rope drive
Crossed flat belt drive
Chain drive
V-belt drive

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Machine Design
The standard length of the shaft is

All of these
7 m
5 m
6 m

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Machine Design
In a transverse fillet welded joint, the size of weld is __________ the throat of weld.

Double
Equal to
0.5 times
2 times

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