Machine Design
A self locking screw has

Course threads
Fine threads
Coefficient of friction is greater than tangent of load angle
Hole for inserting split pin

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
The contact ratio is the ratio of

Length of path of contact to the circular pitch
Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)

T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n
T₁/T₂ = (μθ)n
T₁/T₂ = μθ × n
T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n

ANSWER DOWNLOAD EXAMIANS APP