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Machine Design

Machine Design
The wear load should be __________ the dynamic load.

Less than
None of these
Greater than
Equal to

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Machine Design
Oil in journal bearing should be applied at the point where load is

Nil or lightest
Maximum
Average
Any one of the above

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Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

1.2 d
1.57 d
1.8 d
0.8 d

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

l
2 l
l/2
l/√2

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° + φ/2
90° - φ
45° - φ/2
45° - φ

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Machine Design
Resistance to fatigue of a material is measured by

Young's modulus
Endurance limit
Elastic limit
Coefficient of elasticity

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