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Machine Design

Machine Design
In the levers of __________ type, the mechanical advantage is less than one.

Second
None of these
Third
First

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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
Taper usually provided on cotter is

1 in 5
1 in 40
1 in 10
1 in 24

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Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Clearance circle diameter × cosφ
Pitch circle diameter × sinφ
Addendum circle diameter × cosφ
Pitch circle diameter × cosφ

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

Bulk modulus
Elastic limit
Factor of safety
Strain

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Machine Design
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________.

Less than unity
Greater than unity
Equal to 1
None of these

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