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Machine Design

Machine Design
The efficiency of a riveted joint is equal to

Least of Pt, Ps and Pc/P
Ps /P
Pt /P
Pc /P

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

More than 50%
None of these
Less than 50%
Equal to 50%

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Machine Design
Which of the following statement is correct, for two shafts connected in parallel?

Shear stress in each shaft is the same
Angle of twist of each shaft is the same
Torsional stiffness of each shaft is the same
Torque in each shaft is the same

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Machine Design
Which of the following pipe joints would be suitable for pipes carrying steam?

Bell and spigot
Flanged
Threaded
Expansion

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

2840 d
1420 d
2080 d
1680 d

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Machine Design
If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will

Increase
Decrease
None of these
Have same value as that of standard specimen

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