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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

Square
Metric
NPT (national pipe threads).
Buttress

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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

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

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Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Grinding and lapping surface
Hot working
Cold working
Shot peening

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Machine Design
The maximum bending stress in a curved beam having symmetrical section always occur at the

Inside fiber
Neutral axis
Centroidal axis
Outside fiber

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Machine Design
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

0.97
0.98
0.96
0.99

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Machine Design
In a transverse fillet welded joint, the size of weld is __________ the throat of weld.

Equal to
2 times
Double
0.5 times

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