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Machine Design

Machine Design
The most important dimension in the design of a nut is

Pitch diameter
Outside diameter
Inside diameter
Height

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Machine Design
The ratio of the ultimate stress to the design stress is known as

Bulk modulus
Factor of safety
Elastic limit
Strain

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Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Enhance the load carrying capacity of the jack
Prevent the rotation of load being lifted
Reduce the effort needed for lifting the working load
Reduce the value of frictional torque

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Machine Design
When a metal or alloy is cold worked,

It is worked below recrystallization temperature
Both (A) and (B)
Its hardness and strength increases
None of these

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Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum shear stress theory
Maximum principal stress theory
Maximum distortion energy theory
Maximum strain energy theory

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ + k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ k₂)
(k₁ k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ + k₂)

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