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Strength of Materials

If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?

Strength of Materials /
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?

A. meet in a point
B. be all parallel
C. at least two of them must meet
D. all the above are correct
E. none of the above

If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________? Read More »

Strength of Materials

The algebraic sum of moments of the forces forming couple about any point in their plane is________________?

Strength of Materials /
The algebraic sum of moments of the forces forming couple about any point in their plane is________________?

A. equal to the moment of the couple
B. constant
C. both of above are correct
D. both of above are wrong
E. none of the above

The algebraic sum of moments of the forces forming couple about any point in their plane is________________? Read More »

Strength of Materials

A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?

Strength of Materials /
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?

A. remain horizontal
B. slant up towards direction of pull
C. slant down towards direction of pull
D. unpredictable
E. none of the above

A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________? Read More »

Strength of Materials

If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella_________________?

Strength of Materials /
If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella_________________?

A. more inclined when moving
B. less inclined when moving
C. more inclined when standing
D. less inclined when standing
E. none of the above

If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella_________________? Read More »

Strength of Materials

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___________________?

Strength of Materials /
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___________________?

A. W
B. W sin (a + $)
C. Wtan(a + <|))
D. Wan(a-)
E. Wtana

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___________________? Read More »

Strength of Materials

Coefficient of friction is the__________________?

Strength of Materials /
Coefficient of friction is the__________________?

A. angle between normal reaction and the resultant of normal reaction and the limiting friction
B. ratio of limiting friction and normal reaction
C. the friction force acting when the body is just about to move
D. the friction force acting when the body is in motion
E. tangent of angle of repose

Coefficient of friction is the__________________? Read More »

Strength of Materials

On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be__________________?

Strength of Materials /
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be__________________?

A. downwards at its upper end
B. upwards at its upper end
C. perpendicular to the wall at its upper end
D. zero at its upper end
E. none of the above

On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be__________________? Read More »

Strength of Materials

Which one of the following statements is not correct_________________?

Strength of Materials /
Which one of the following statements is not correct_________________?

A. the tangent of the angle of friction is equal to coefficient of friction
B. the angle of repose is equal to angle of friction
C. the tangent of the angle of repose is equal to coefficient of friction
D. the sine of the angle of repose is equal to coefficient to friction
E. none of the above

Which one of the following statements is not correct_________________? Read More »

Strength of Materials