An ideal machine is one whose efficiency is

Engineering Mechanics
An ideal machine is one whose efficiency is

Between 60 and 70 %

Between 80 and 90%

Between 70 and 80%

1

Between 60 and 70 %

Between 80 and 90%

Between 70 and 80%

1

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

P = W tan (α + φ)

P = W tan (φ - α)

P = W tan (α - φ)

P = W cos (α + φ)

P = W tan (α + φ)

P = W tan (φ - α)

P = W tan (α - φ)

P = W cos (α + φ)

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Engineering Mechanics
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The sum of the resolved parts of the forces in the given direction

The difference of the forces multiplied by the cosine of θ

The algebraic sum of the resolved parts of the forces in the given direction

The sum of the forces multiplied by the sine of θ

The sum of the resolved parts of the forces in the given direction

The difference of the forces multiplied by the cosine of θ

The algebraic sum of the resolved parts of the forces in the given direction

The sum of the forces multiplied by the sine of θ

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Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Towards the wall at its upper end

Upward at its upper end

Downward at its upper end

Away from the wall at its upper end

Towards the wall at its upper end

Upward at its upper end

Downward at its upper end

Away from the wall at its upper end

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Engineering Mechanics
Which is the correct statement about law of polygon of forces?

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

If a polygon representing forces acting at a point is closed then forces are in equilibrium

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

If a polygon representing forces acting at a point is closed then forces are in equilibrium

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

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Engineering Mechanics
The horizontal range of a projectile (R) is given by

R = u² sinα/g

R = u² sin2α/g

R = u² cosα/g

R = u² cos2α/g

R = u² sinα/g

R = u² sin2α/g

R = u² cosα/g

R = u² cos2α/g

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Engineering Mechanics

Engineering Mechanics An ideal machine is one whose efficiency is

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

Engineering Mechanics The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

Engineering Mechanics A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Engineering Mechanics Which is the correct statement about law of polygon of forces?

Engineering Mechanics The horizontal range of a projectile (R) is given by

Engineering Mechanics
An ideal machine is one whose efficiency is

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

Engineering Mechanics
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Engineering Mechanics
Which is the correct statement about law of polygon of forces?

Engineering Mechanics
The horizontal range of a projectile (R) is given by