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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

0.2
0.5
0.35
0.65

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Machine Design
The dedendum is the radial distance from the

Pitch circle to the top of a tooth
Addendum circle to the clearance circle
Top of a tooth to the bottom of a tooth
Pitch circle to the bottom of a tooth

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Machine Design
Which of the following is a permanent fastening?

Bolts
Cotters
Keys
Rivets

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Machine Design
For circumferential joint in boilers, the type of joint used is

Butt joint with single cover plate
Any one of the above
Lap joint with one ring overlapping the other
Butt joint with double cover plate

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/9
W/2
8W/9
2W/3

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Machine Design
The stress in the bar when the load is applied suddenly is __________ as compared to the stress induced due to gradually applied loads.

Same
Double
Four times
Three times

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