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Machine Design

Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

3 d
5 d
4 d
2 d

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Machine Design
The railway carriage couplings have

Knuckle threads
Acme threads
Buttress threads
Square threads

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Machine Design
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

√2P/s.l
2P/s.l
P/√2.s.l
P/2.s.l

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Machine Design
Which of the following screw thread is used for power transmission in one direction only?

Buttress threads
Multiple threads
Acme threads
Square threads

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

(p - d) t.σt
p.t.σt
p.d.σt

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Machine Design
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to (Where, Pc = tension in belt due to centrifugal force)

3 Pc
Pc/3
1 Pc
2 Pc

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