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Machine Design

Machine Design
The belt slip occurs due to

Loose belt
Heavy load
Any one of the above
Driving pulley too small

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Machine Design
Stress concentration in cyclic loading is more serious in

Ductile materials
Depends on other factors
Brittle materials
Equally serious in both cases

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Machine Design
According to maximum normal stress theory, the maximum normal stress in the shaft is

(1/2) × [σ + √(σ² × 4τ²)]
σ + √(σ² × 4τ²)
√(σ² × 4τ²)
(1/2) × √(σ² × 4τ²)

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(4WD/ πd3) × K
(2WD/ πd3) × K
(WD/ πd3) × K
(8WD/ πd3) × K

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Machine Design
When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as

Miter gears
Internal bevel gears
Crown bevel gears
Angular 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/2a)]
σ [1 + (3a/b)]
σ [1 + (b/3a)]
σ [1 + (2a/b)]

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