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Machine Design

Machine Design
The fatigue life of a part can be improved by

Electroplating
Polishing
Shot peening
Coating

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Machine Design
Which of the following formula is used in designing a connecting rod?

Rankine's formula
Johnson's straight line formula
Euler's formula
Johnson's parabolic formula

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Machine Design
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

Hollow saddle key
Hollow key
Soft key
None of these

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Machine Design
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

15 times
5 times
20 times
10 times

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kf - 1)/ (Kt - 1)
(Kt - 1)/ (Kf - 1)
(Kt + 1)/ (Kf + 1)
(Kf + 1)/ (Kt + 1)

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Machine Design
In order to remove internal stresses produced by hardening the steel, the process usually adopted is

Spheroidizing
Tempering
Normalizing
Annealing

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