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Machine Design

Machine Design
The cross-section of the arm of a bell crank lever is

Any one of these
I-section
Rectangular
Elliptical

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

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Machine Design
The arms of the pulleys for flat belt drive have

Elliptical cross-section
Major axis twice the minor axis
All the three characteristics
Major axis in plane of rotation

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Machine Design
For maximum power, the velocity of the belt will be

None of these
√(T/2m)
√(T/m)
√(T/3m)

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

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Machine Design
In a journal bearing, the load on the bearing is __________ to the axis of the journal.

None of these
Both A and B
Parallel
Perpendicular

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