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

Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
Slenderness ratio is the ratio of

Width of column to depth of column
Effective length of column to least radius of gyration of the column
Effective length of column to width of column
Maximum size of column to minimum size of column

ANSWER DOWNLOAD EXAMIANS APP