CARBOHYDRATE QUIZ

The effort required to lift a load W on a screw jack with helix angle a and angle of friction<="" div="">

Wcos(a + )

Wtan(a + <)>)

Wtan(a-<)>)

Wsin(a + <(>)

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The coefficient of friction depends on

area of contact

nature of surface

strength of surfaces

shape of surfaces

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D Alembert’s principle is used for

designing safe structures

determining stresses in the truss

stability of floating bodies

reducing the problem of kinetics to equivalent statics problem

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The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of

independence of forces

forces

balance of force

resolution of forces.

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Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction

horizontally

vertically

at an angle equal to the angle of friction to the inclined plane

along the plane

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YOUR ANSWER : ?

Forces are called coplanar when all of them acting on body lie in

one point

one plane

different planes

perpendicular planes

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Two coplanar couples having equal and opposite moments

Balance each other

Produce a couple and an unbalanced force

Are equivalent

Produce a moment of couple

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Which one of the following statements is not correct

the angle of repose is equal to angle of friction

the tangent of the angle of friction is equal to coefficient of friction

the tangent of the angle of repose is equal to coefficient of friction

the sine of the angle of repose is equal to coefficient to friction

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The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60Â° produce resultant of Vl3 kg. These forces are

2 and V6

V5 and V5

2 and 5

3 and 1 kg

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A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to

Wan(a-)

W sin (a + $)

Wtan(a + <|))

W

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