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Machine Design

Machine Design
The spring mostly used in gramophones is

Helical spring
Flat spiral spring
Volute spring
Conical spring

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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
P/2.s.l
P/√2.s.l
√2P/s.l

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Machine Design
A shaft coupling should

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

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Machine Design
Which of the following is a permanent fastening?

Bolts
Rivets
Keys
Cotters

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Machine Design
The stress in the threaded part of the bolt will be __________ as compared to the shank.

None of these
Lower
Higher
Same

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Machine Design
When the belt is transmitting maximum power, the belt speed should be (Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

√(Pmax / 2m)
√(3m /Pmax)
√(Pmax / 3m)
√(Pmax / m)

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