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Machine Design

Machine Design
The suitable material for belt in agricultural machinery is

Balata gum
Rubber
Cotton duck
Leather

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Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

3-15 m/s
1-3 m/s
30-50 m/s
15-30 m/s

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Machine Design
Creep in belt is due to

Material of the pulley
All of these
Uneven extensions and contractions due to varying tension
Material of the belt

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Machine Design
The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Extremely hazardous
Best method
Has no effect as regards fatigue strength
Cheapest method

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

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

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Machine Design
Multiple threads are used to secure

High mechanical advantage
High efficiency
Low efficiency
High load lifting capacity

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