Engineering Mechanics Mcqs
This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Engineering Mechanics ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Engineering Mechanics comprehensively.
32. Coulomb friction is the friction between _________________?
Bodies having relative motion
Two dry surfaces
Two lubricated surfaces
Solids and liquids
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33. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_______________?
0°
30°
45°
60°
34. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t – 4), the acceleration of the particle will be given by the equation __________________?
3t2-lt
3t2+2t
6f-8
6f-4
35. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella___________________?
More inclined when moving
Less inclined when moving
More inclined when standing
Less inclined when standing
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36. 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________________?
W
W sin (a + $)
Wtan(a + <|))
Wan(a-)
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37. Coefficient of friction is the_________________?
Angle between normal reaction and the resultant of normal reaction and the limiting friction
Ratio of limiting friction and normal reaction
The friction force acting when the body is just about to move
The friction force acting when the body is in motion
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38. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be_________________?
Downwards at its upper end
Upwards at its upper end
Perpendicular to the wall at its upper end
Zero at its upper end
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39. Friction force for dry surfaces. Friction force is________________?
K up wrong statement?
Proportional to normal load between the surfaces
Dependent on the materials of contact surface
Proportional to velocity of sliding
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40. The weight of a body is due to ___________________?
Centripetal force of earth
Gravitational pull exerted by the earth
Forces experienced by body in atmosphere
Force of attraction experienced by particles
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41. When trying to turn a key into a lock, following is applied _____________________?
Coplanar force
Non-coplanar forces
Lever
Moment
Couple
42. According to principle of transmissibility of forces, the effect of a force upon a body is_________________?
Maximum when it acts at the center of gravity of a body
Different at different points in its line of action
The same at every point in its line of action
Minimum when it acts at the C.G. of the body
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43. A number of forces acting at a point will be in equilibrium if_____________________?
Their total sum is zero
Two resolved parts in two directions at right angles are equal
Sum of resolved parts in any two per-pendicular directions are both zero
All of them are inclined equally
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44. According to principle of moments__________________?
If a system of coplanar forces is in equilibrium, then their algebraic sum is zero
If a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
The algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
Positive and negative couples can be balanced
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45. If a rigid body is in equilibrium under the action of three forces, then _____________________?
These forces are equal
The lines of action of these forces meet in a point
The lines of action of these forces are parallel
B. and C. above
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