In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should

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In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should

A. Be zero

B. Act in upward direction

C. Act in downward direction

D. None of the above

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In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

A. ω sinθ/(n² - sin²θ)^1/2

B. ω cosθ/(n² - cos²θ)^1/2

C. ω sinθ/(n² - cos²θ)^1/2

D. ω cosθ/(n² - sin²θ)^1/2

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The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

A. l₁ = k_G

B. l₂ = k_G

C. l₁l₂ = k_G

D. l₁l₂ = k_G²

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Which of the following statement is wrong?

A. A round bar in a round hole form a turning pair

B. A square bar in a square hole form a sliding pair

C. A vertical shaft in a foot step bearing forms a successful constraint

D. All of the above

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A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

A. a is +ve and b = 0

B. a = 0 and b is +ve

C. a is +ve and b is -ve

D. a is +ve and b is also +ve

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The centre of gravity of a coupler link in a four bar mechanism will experience

A. No acceleration

B. Only linear acceleration

C. Only angular acceleration

D. Both linear and angular acceleration

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When a point moves along a straight line, its acceleration will have

A. Radial component only

B. Tangential component only

C. Coriolis component only

D. Radial and tangential components both

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A rotary internal combustion engine has __________ cylinders.

A. Four

B. Five

C. Six

D. Seven

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The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.

A. Less

B. More

C. Same

D. None of these

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The power of a Porter governor is equal to

A. [c²/(1 + 2c)] (m + M) g.h

B. [2c²/(1 + 2c)] (m + M) g.h

C. [3c²/(1 + 2c)] (m + M) g.h

D. [4c²/(1 + 2c)] (m + M) g.h

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In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

A. P = W tan(α - φ)

B. P = W tan(α + φ)

C. P = W tan(φ - α)

D. P = W cos(α + φ)

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In a spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor.

A. Remains constant

B. Decreases

C. Increases

D. None of these

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In a ball bearing, ball and bearing forms a

A. Turning pair

B. Rolling pair

C. Screw pair

D. Spherical pair

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A system of masses rotating in different parallel planes is in dynamic balance if the

A. Resultant force is equal to zero

B. Resultant couple is equal to zero

C. Resultant force and resultant couple are both equal to zero

D. Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero

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When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

A. Zero

B. One

C. π/2

D. π

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A completely constrained motion can be transmitted with.

A. 1 link with pin joints

B. 2 links with pin joints

C. 3 links with pin joints

D. 4 links with pin joints

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A governor is said to be stable, if the

A. Radius of rotation of balls increases as the equilibrium speed decreases

B. Radius of rotation of balls decreases as the equilibrium speed decreases

C. Radius of rotation of balls increases as the equilibrium speed increases

D. Radius of rotation of balls decreases as the equilibrium speed increases

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The Klein's diagram is used when

A. Crank has uniform angular velocity

B. Crank has nonuniform angular velocity

C. Crank has uniform angular acceleration

D. Crank has nonuniform angular acceleration

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The centre of percussion is below the centre of gravity of the body and is at a distance equal to

A. h/k_G

B. h²/k_G

C. k_G²/h

D. h × k_G

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The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at

A. 45° in the direction of rotation of the link containing the path

B. 45° in the direction opposite to the rotation of the link containing the path

C. 90° in the direction of rotation of the link containing the path

D. 180° in the direction opposite to the rotation of the link containing the path

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The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

A. ω (r₁ r₂) sinθ

B. ω (r₁ + r₂) sinθ sec2θ

C. ω (r₁ r₂) cosθ

D. ω (r₁ + r₂) cosθ cosec2θ

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The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

A. 0° and 90°

B. 180° and 360°

C. Both (A) and (B)

D. None of these

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The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position)

A. ω √(x² - r²)

B. ω √(r² - x²)

C. ω² √(x² - r²)

D. ω² √(r² - x²)

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The transmissibility, for all values of damping factor, will be less than unity, if ω/ω_n is

A. Equal to 1

B. Less than 2

C. Equal to 2

D. Greater than 2

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For an isochronous Hartnell governor (where r₁ and r₂ = Maximum and minimum radius of rotation of balls respectively, S₁ and S₂ = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)

A. (m.g + S₁)/(m.g + S₂) = r₁/r₂

B. (m.g - S₁)/(m.g - S₂) = r₂/r₁

C. S₁/S₂ = r₁/r₂

D. S₂/S₁ = r₁/r₂

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Module of a gear is

A. D/T

B. T/D

C. 2D/T

D. 2T/D

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Which of the following is a spring controlled governor?

A. Hartnell governor

B. Hartung governor

C. Wilson-Hartnell governor

D. All of these

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Which gear train is used for higher velocity ratios in a small space?

A. Simple gear train

B. Compound gear train

C. Reverted gear train

D. Epicyclic gear train

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When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

A. Free vibration

B. Forced vibration

C. Damped vibration

D. Under damped vibration

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If two moving elements have surface contact in motion, such pair is known as

A. Sliding pair

B. Rolling pair

C. Surface pair

D. Higher pair

Discuss this answer

Pulley in a belt drive acts as

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair

Discuss this answer

Accepted Answer

C. Act in downward direction

In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should

Correct Answer :

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Related Questions

In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

Which of the following statement is wrong?

A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

The centre of gravity of a coupler link in a four bar mechanism will experience

When a point moves along a straight line, its acceleration will have

A rotary internal combustion engine has __________ cylinders.

The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.

The power of a Porter governor is equal to

In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

In a spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor.

In a ball bearing, ball and bearing forms a

A system of masses rotating in different parallel planes is in dynamic balance if the

When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

A completely constrained motion can be transmitted with.

A governor is said to be stable, if the

The Klein's diagram is used when

The centre of percussion is below the centre of gravity of the body and is at a distance equal to

The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at

The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position)

The transmissibility, for all values of damping factor, will be less than unity, if ω/ω_n is

For an isochronous Hartnell governor (where r₁ and r₂ = Maximum and minimum radius of rotation of balls respectively, S₁ and S₂ = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)

Module of a gear is

Which of the following is a spring controlled governor?

Which gear train is used for higher velocity ratios in a small space?

When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

If two moving elements have surface contact in motion, such pair is known as

Pulley in a belt drive acts as

Also checkout

In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should

Correct Answer :

Show all Theory of Machines MCQ

Related Questions

In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

Which of the following statement is wrong?

A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

The centre of gravity of a coupler link in a four bar mechanism will experience

When a point moves along a straight line, its acceleration will have

A rotary internal combustion engine has __________ cylinders.

The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.

The power of a Porter governor is equal to

In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

In a spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor.

In a ball bearing, ball and bearing forms a

A system of masses rotating in different parallel planes is in dynamic balance if the

When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

A completely constrained motion can be transmitted with.

A governor is said to be stable, if the

The Klein's diagram is used when

The centre of percussion is below the centre of gravity of the body and is at a distance equal to

The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at

The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position)

The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is

For an isochronous Hartnell governor (where r₁ and r₂ = Maximum and minimum radius of rotation of balls respectively, S₁ and S₂ = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)

Module of a gear is

Which of the following is a spring controlled governor?

Which gear train is used for higher velocity ratios in a small space?

When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

If two moving elements have surface contact in motion, such pair is known as

Pulley in a belt drive acts as

Also checkout

The transmissibility, for all values of damping factor, will be less than unity, if ω/ω_n is