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 = (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

T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n

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Machine Design
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

T₁/T₂ =eμθ

log (T₁/T₂) = μθ

T₁/T₂ = log μθ

T₁/T₂ = μθ

T₁/T₂ =eμθ

log (T₁/T₂) = μθ

T₁/T₂ = log μθ

T₁/T₂ = μθ

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2136 N-m

2000 N-m

2050 N-m

2100 N-m

2136 N-m

2000 N-m

2050 N-m

2100 N-m

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Machine Design
Wahl's stress factor __________ very rapidly as the spring index decreases.

Remain same

Increases

None of these

Decreases

Remain same

Increases

None of these

Decreases

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Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

One-fourth

Double

One-eighth

One-half

One-fourth

Double

One-eighth

One-half

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Machine Design
An open belt drive is used when

Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

Shafts are arranged at right angles and rotate in one definite direction

Shafts are arranged parallel and rotate in the same directions

Shafts are arranged parallel and rotate in the opposite directions

Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

Shafts are arranged at right angles and rotate in one definite direction

Shafts are arranged parallel and rotate in the same directions

Shafts are arranged parallel and rotate in the opposite directions

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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 The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

Machine Design Wahl's stress factor __________ very rapidly as the spring index decreases.

Machine Design An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

Machine Design An open belt drive is used when

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
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

Machine Design
Wahl's stress factor __________ very rapidly as the spring index decreases.

Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

Machine Design
An open belt drive is used when