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

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

T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n

T₁/T₂ = (μ θ)n

T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n

T₁/T₂ = μ. θ. n

T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n

T₁/T₂ = (μ θ)n

T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n

T₁/T₂ = μ. θ. n

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Theory of Machine
Pitch point on a cam is

Any point on pitch circle

Any point on pitch curve

The point on cam pitch curve having the maximum pressure angle

The point on cam pitch curve having the minimum pressure angle

Any point on pitch circle

Any point on pitch curve

The point on cam pitch curve having the maximum pressure angle

The point on cam pitch curve having the minimum pressure angle

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Theory of Machine
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

ω² × OQ tanθ

ω² × OQ cosθ

ω² × OQ sinθ

ω² × OQ

ω² × OQ tanθ

ω² × OQ cosθ

ω² × OQ sinθ

ω² × OQ

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is independent of me area of contact.

The friction force is directly proportional to the normal force.

The friction force is dependent on the materials of the contact surfaces.

All of these

The friction force is independent of me area of contact.

The friction force is directly proportional to the normal force.

The friction force is dependent on the materials of the contact surfaces.

All of these

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Theory of Machine
In a screw jack, the effort required to lower the load W is given by

P = W tan(α + φ)

P = W tan(α - φ)

P = W tan(φ - α)

P = W cos(α + φ)

P = W tan(α + φ)

P = W tan(α - φ)

P = W tan(φ - α)

P = W cos(α + φ)

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Theory of Machine
The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by

ω². (r₁ r₂). (1 - cos² θ)

ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]

ω². (r₁ + r₂). (1 + cos² θ)

ω². (r₁ - r₂). (1 - sin² θ)

ω². (r₁ r₂). (1 - cos² θ)

ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]

ω². (r₁ + r₂). (1 + cos² θ)

ω². (r₁ - r₂). (1 - sin² θ)

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Theory of Machine

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

Theory of Machine Pitch point on a cam is

Theory of Machine The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

Theory of Machine Which of the following statements regarding laws governing the friction between dry surfaces are correct?

Theory of Machine In a screw jack, the effort required to lower the load W is given by

Theory of Machine The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by

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

Theory of Machine
Pitch point on a cam is

Theory of Machine
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

Theory of Machine
In a screw jack, the effort required to lower the load W is given by

Theory of Machine
The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by