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)

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

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

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Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

(T₁ + T₂ + Tc)/2

T₁ - T₂ + Tc

(T₁ - T₂ + Tc)/2

T₁ + T₂ + Tc

(T₁ + T₂ + Tc)/2

T₁ - T₂ + Tc

(T₁ - T₂ + Tc)/2

T₁ + T₂ + Tc

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Machine Design
In a hydrodynamic lubricated bearing

There is a thick film of lubricant between the journal and the bearing

There is no lubricant between the journal and the bearing

There is a thin film of lubricant between the journal and the bearing

The lubricant is forced between the journal and the bearing, by external pressure

There is a thick film of lubricant between the journal and the bearing

There is no lubricant between the journal and the bearing

There is a thin film of lubricant between the journal and the bearing

The lubricant is forced between the journal and the bearing, by external pressure

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Machine Design
Auto frettage is the method of

Joining thick cylinders

Pre-stressing thick cylinders

Calculating stresses in thick cylinders

Increasing the life of thick cylinders

Joining thick cylinders

Pre-stressing thick cylinders

Calculating stresses in thick cylinders

Increasing the life of thick cylinders

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Machine Design
The standard length of the shaft is

6 m

5 m

All of these

7 m

6 m

5 m

All of these

7 m

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Machine Design
The included angle for the British standard whitworth thread is

47.5°

55°

60°

29°

47.5°

55°

60°

29°

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Machine Design

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)

Machine Design If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

Machine Design In a hydrodynamic lubricated bearing

Machine Design Auto frettage is the method of

Machine Design The standard length of the shaft is

Machine Design The included angle for the British standard whitworth thread is

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)

Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

Machine Design
In a hydrodynamic lubricated bearing

Machine Design
Auto frettage is the method of

Machine Design
The standard length of the shaft is

Machine Design
The included angle for the British standard whitworth thread is