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Machine Design

Machine Design
The product of the diametral pitch and circular pitch is equal to

π × number of teeth
1
1/π
π

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Machine Design
When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

Knuckle threads
Square threads
Acme threads
Buttress threads

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Machine Design
The cold working of metals is carried out __________ the recrystallization temperature.

None of these
At
Above
Below

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Machine Design
A V-belt designated as B 4430 LP has

4430 mm as diameter of small pulley
4430 mm as centre distance between pulleys
4430 mm as nominal pitch length
4430 mm as diameter of large pulley

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Machine Design
Which one of the following loading is considered for the design of axles?

Bending moment only
Twisting moment only
Combined bending moment and twisting moments
Combined action of bending moment, twisting moment and axial thrust

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (b/3a)]
σ [1 + (2a/b)]
σ [1 + (3a/b)]
σ [1 + (b/2a)]

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