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Machine Design

Machine Design
Which of the following has threads at both ends?

Stud
Bolt
None of these
Tap bolt

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Machine Design
Auto frettage is the method of

Increasing the life of thick cylinders
Joining thick cylinders
Calculating stresses in thick cylinders
Pre-stressing thick cylinders

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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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Machine Design
The suitable material for belt in agricultural machinery is

Balata gum
Leather
Rubber
Cotton duck

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Machine Design
Gears are casted by

Sand mould casting
Slush casting
Centrifugal casting
Permanent mould casting

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Machine Design
The design of the pressure vessel is based on

Longitudinal stress
Longitudinal and hoop stress
None of these
Hoop stress

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