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Machine Design

Machine Design
In a full journal bearing, the angle of contact of the bearing with the journal is

360°
270°
180°
120°

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Machine Design
If a bearing is designated by the number 305, it means that the bearing is of

Light series whose bore is 25 mm
Light series whose bore is 5 mm
Medium series whose bore is 25 mm
Medium series whose bore is 5 mm

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

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Machine Design
A shaft is subjected to

Bending stresses
All of these
Shear stresses
Combined bending and shear stresses

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Machine Design
The spring mostly used in gramophones is

Volute spring
Helical spring
Flat spiral spring
Conical spring

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MORE MCQ ON Machine Design

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