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Machine Design

Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

3 to 5
5 to 10
0.5 to 1
1 to 2

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.5
3
2.8
3.5

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Machine Design
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

d = √t
d = 2√t
d = 6√t
d = 1.6√t

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Machine Design
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.

Rectangular
Parallel
Square
None of these

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Machine Design
The shock absorbing capacity of a bolt can be increased by

Making shank diameter equal to core diameter of thread
Tightening it properly
Grinding the shank
Increasing shank diameter

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Machine Design
The bearings of medium series have capacity __________ over the light series.

30 to 40%
20 to 30%
40 to 50%
10 to 20%

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