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Machine Design

Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

None of these
Smallest
Largest
Effective

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Machine Design
In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.

160°
90°
135°
180°

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Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Depends on heat treatment carried out
Increases markedly
Remain same
Decreases markedly

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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
The longitudinal stress is __________ of the circumferential stress.

Two-third
Double
Three-fourth
One-half

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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

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

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