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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1.
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

A polygon taken in order, 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, then the forces are in equilibrium

If a polygon representing forces acting at a point is closed then forces are in equilibrium

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2.
If a number of forces act simultaneously on a particle, it is possible _____________________?

Not a replace them by a single force

To replace them by a single force

To replace them by a single force through C.G.

To replace them by a couple

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3.
A force is completely defined when we specify_______________?

Magnitude

Direction

Point of application

All of the above

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4.
Effect of a force on a body depends upon ________________?

Magnitude

Direction

Position or line of action

All of the above

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5.
A force acting on a body may_________________?

Introduce internal stresses

Balance the other forces acting on it

Retard its motion

Change its motion

All of the above

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7.
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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8.
Dynamic friction as compared to static friction is___________________?

Same

More

Less

May be less of more depending on nature of surfaces and velocity

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9.
Limiting force of friction is the__________________?

Tangent of angle between normal-reaction and the resultant of normal reaction and 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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10.
Tangent of angle of friction is equal to__________________?

Kinetic friction

Limiting friction

Angle of repose

Coefficient of friction

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11.
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____________________?

Remain horizontal

Slant up towards direction of pull

Slant down towards direction of pull

Unpredictable

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12.
The algebraic sum of moments of the forces forming couple about any point in their plane is_________________?

Equal to the moment of the couple

Constant

Both of above are correct

Both of above are wrong

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13.
The necessary condition for forces to be in equilibrium is that these should be_________________?

Coplanar

Meet at one point ,

Both A. and B. above

All be equal

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14.
A cable with a uniformly distributed load per horizontal meter run will take the following shape________________?

Straight line

Parabola

Hyperbola

Elliptical

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15.
In actual machines_______________?

Mechanical advantage is greater than velocity ratio

Mechanical advantage is equal to velocity ratio

Mechanical advantage is less than velocity ratio

Mechanical advantage is unity

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