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Machine Design

Machine Design
In Vickers hardness testing, the pyramid indentor apex is

122°
136°
152°
40°

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Remains unchanged
None of these
Increases
Decreases

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Machine Design
The maximum efficiency of a square threaded screw is

(1 + sinφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + sinφ)
(1 - sinφ)/ (1 + cosφ)
(1 + cosφ)/ (1 - sinφ)

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Machine Design
In case of pressure vessels having open ends, the fluid pressure induces

Longitudinal stress
None of these
Circumferential stress
Shear stress

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Machine Design
Stress concentration in cyclic loading is more serious in

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

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Machine Design
The strap end of a connecting rod of steam engine is joined by

Spigot socket cotter joint
Knuckle joint
Gib of cotter joint
Sleeve and cotter joint

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