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Machine Design

Machine Design
The helix angle for double helical gears may be made up to

90°
60°
45°
75°

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Machine Design
The difference between the upper limit and lower limit of a dimension is called

Actual size
Tolerance
Basic size
Nominal size

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Machine Design
I.S. specifies following total number of grades of tolerances

18
16
22
20

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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
2P/s.l
P/√2.s.l
√2P/s.l

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Machine Design
The material commonly used for crane hooks is

Mild steel
Wrought iron
Cast iron
Aluminium

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Machine Design
In leaf springs, the longest leaf is known as

Master leaf
None of these
Lower leaf
Upper leaf

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