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Machine Design

Machine Design
The included angle in unified of American National threads is

29°
47°
60°
55°

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Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

One-fourth
Double
One-half
One-third

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Machine Design
The suitable material for belt in agricultural machinery is

Leather
Cotton duck
Rubber
Balata gum

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Machine Design
When two springs are in series (having stiffness K), the equivalent stiffness will be

K/4
K
2K
K/2

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Machine Design
The included angle between the sides of V-belt is

38°
45°
60°
40°

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Machine Design
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

4 kN-m
1 kN-m
2 kN-m
3 kN-m

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