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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

Buttress
NPT (national pipe threads).
Square
Metric

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Machine Design
The constant factor in case of R10 series of preferred numbers is

1.12
1.26
1.06
1.58

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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

P/2.s.l
P/√2.s.l
2P/s.l
√2P/s.l

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

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

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Machine Design
A shaft coupling should

Be easy to connect or disconnect
Transmit full power of the shaft
All of these
Hold the shafts in perfect alignment

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/9
W/2
2W/3
8W/9

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