For a self locking machine, the efficiency must be

Engineering Mechanics
For a self locking machine, the efficiency must be

Equal to 50%

Less than 50%

Greater than 50%

1

Equal to 50%

Less than 50%

Greater than 50%

1

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Engineering Mechanics
The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

D × d

D - d

D + d

D / d

D × d

D - d

D + d

D / d

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Engineering Mechanics
Coplanar concurrent forces are those forces which

Do not meet at one point and their lines of action do not lie on the same plane

Do not meet at one point, but their lines of action lie on the same plane

Meet at one point and their lines of action also lie on the same plane

Meet at one point, but their lines of action do not lie on the same plane

Do not meet at one point and their lines of action do not lie on the same plane

Do not meet at one point, but their lines of action lie on the same plane

Meet at one point and their lines of action also lie on the same plane

Meet at one point, but their lines of action do not lie on the same plane

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Engineering Mechanics
The velocity ratio of a single purchase crab winch can be increased by

Increasing the length of the handle

All of these

Increasing the radius of the load drum

Increasing the number of teeth of the pinion

Increasing the length of the handle

All of these

Increasing the radius of the load drum

Increasing the number of teeth of the pinion

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Engineering Mechanics
The moment of a force

Is the turning effect produced by a force, on the body, on which it acts

Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

All of these

Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

Is the turning effect produced by a force, on the body, on which it acts

Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

All of these

Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

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Engineering Mechanics
The forces, whose lines of action are parallel to each other and act in the same directions, are known as

Unlike parallel forces

Like parallel forces

Coplanar non-concurrent forces

Coplanar concurrent forces

Unlike parallel forces

Like parallel forces

Coplanar non-concurrent forces

Coplanar concurrent forces

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Engineering Mechanics

Engineering Mechanics For a self locking machine, the efficiency must be

Engineering Mechanics The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

Engineering Mechanics Coplanar concurrent forces are those forces which

Engineering Mechanics The velocity ratio of a single purchase crab winch can be increased by

Engineering Mechanics The moment of a force

Engineering Mechanics The forces, whose lines of action are parallel to each other and act in the same directions, are known as

Engineering Mechanics
For a self locking machine, the efficiency must be

Engineering Mechanics
The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

Engineering Mechanics
Coplanar concurrent forces are those forces which

Engineering Mechanics
The velocity ratio of a single purchase crab winch can be increased by

Engineering Mechanics
The moment of a force

Engineering Mechanics
The forces, whose lines of action are parallel to each other and act in the same directions, are known as