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Machine Design

Machine Design
The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is

43832
2
1
4

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Machine Design
The maximum efficiency of a square threaded screw is

(1 - sinφ)/ (1 + cosφ)
(1 + cosφ)/ (1 - sinφ)
(1 + sinφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + sinφ)

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Machine Design
Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

Tangent key
Feather key
Woodruff key
Gib-head key

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Machine Design
Factor of safety for fatigue loading is the ratio of

Young's modulus to the ultimate tensile strength
Elastic limit to the working stress
Endurance limit to the working stress
Elastic limit to the yield point

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Machine Design
The permissible stress for carbon steel under static loading is generally taken as

7500-10,000 kg/cm²
3000-4000 kg/cm²
2000-3000 kg/m²
4000-4500 kg/cm²

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Machine Design
If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

T sec³φ
T sec²φ
T/sec³φ
T cosecφ

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