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Machine Design

Machine Design
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

Lighter
Moderate
None of these
Heavier

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Machine Design
For circumferential joint in boilers, the type of joint used is

Butt joint with double cover plate
Any one of the above
Butt joint with single cover plate
Lap joint with one ring overlapping the other

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Machine Design
The fatigue life of a part can be improved by

Shot peening
Electroplating
Polishing
Coating

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Machine Design
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Mitre gears
Internal bevel gears
Angular bevel gears
Crown bevel gears

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

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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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