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Machine Design

Machine Design
If a spring is cut down into two springs, the stiffness of cut springs will be

Half
Double
Same
None of these

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Machine Design
The strength of the unriveted plate (P) per pitch length is equal to

p.t.σt
p.d.σt
(p - d) t.σt
(p - d) σt

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

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2136 N-m
2100 N-m
2050 N-m
2000 N-m

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Machine Design
The objective of caulking in a riveted joint is to make the joint

Free from stress
Free from corrosion
Stronger in tension
Leak-proof

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Machine Design
Stress concentration in static loading is more serious in

Ductile materials
Depends on other factors
Brittle materials
Equally serious in both cases

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