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
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 (α + φ)

P = W cos (α + φ)

P = W tan (φ - α)

P = W tan (α - φ)

P = W tan (α + φ)

P = W cos (α + φ)

P = W tan (φ - α)

ANSWER DOWNLOAD EXAMIANS APP

Engineering Mechanics
If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

Equal to

Greater than

None of these

Less than

Equal to

Greater than

None of these

Less than

ANSWER DOWNLOAD EXAMIANS APP

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 by the sides of a polygon taken in order, 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, 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 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 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, 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 taken in order, then the forces are in equilibrium

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP

Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Perpendicular to the wall at its upper end

Upwards at its upper end

Downwards at its upper end

Zero at its upper end

Perpendicular to the wall at its upper end

Upwards at its upper end

Downwards at its upper end

Zero at its upper end

ANSWER DOWNLOAD EXAMIANS APP

Engineering Mechanics
When the spring of a watch is wound, it will possess

Heat energy

Kinetic energy

Electrical energy

Strain energy

Heat energy

Kinetic energy

Electrical energy

Strain energy

ANSWER DOWNLOAD EXAMIANS APP

Engineering Mechanics

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 If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

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

Engineering Mechanics An ideal machine is one whose efficiency is

Engineering Mechanics On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Engineering Mechanics When the spring of a watch is wound, it will possess

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
If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

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

Engineering Mechanics
An ideal machine is one whose efficiency is

Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Engineering Mechanics
When the spring of a watch is wound, it will possess