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Machine Design

Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.5
0.2
0.65
0.35

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Machine Design
The objective of idler pulley in belt drive is to

Increase the wrap angle and belt tension
All the above objectives
Increase the power transmission capacity
Decrease the tendency of belt to slip

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Decreasing the cross-sectional area of the bar
All of these
Decreasing the modulus of elasticity of the bar
Increasing the length of bar

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Machine Design
The dynamic tooth load is due to

Inaccuracies of tooth spacing
Irregularities in tooth profiles
All of these
Deflections of teeth under load

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

Metric
Square
NPT (national pipe threads).
Buttress

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Machine Design
The anti-friction bearings

Can carry both radial and thrust loads
Have high initial cost
All of these
Have low starting and low running friction at moderate speeds

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