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

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Machine Design
A fast and loose pulley drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the opposite directions

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Machine Design
A woodruff key is

Fitted in pairs at right angles
Capable of tilting in a recess milled out in the shaft
A tapered key with head at one end
All of these

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Machine Design
Which of the following statement is wrong for a connecting rod?

The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy
The most suitable section for the connecting rod is T-section
If Ixx > 4 Iyy, the buckling will occur about Y-axis
If Ixx < 4 Iyy, the buckling will occur about X-axis

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