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.

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31.
The effort required to lift a load W on a screw jack with helix angle a and angle of friction

Wtan(a + )

Wtan(a-)

Wcos(a + )

Wsin(a + )

32.
Coulomb friction is the friction between _________________?

Bodies having relative motion

Two dry surfaces

Two lubricated surfaces

Solids and liquids

33.
A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_______________?

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

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-)

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

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

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

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

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

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

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

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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