Engineering Mechanics

Question: According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then
[A].

their algebraic sum is zero

[B].

their lines of action are at equal distances

[C].

the algebraic sum of their moments about any point in their plane is zero

[D].

the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.

Answer: Option C

Explanation:

No answer description available for this question.

Question: If a number of coplaner forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.
[A].

equal to

[B].

less than

[C].

greater than

Answer: Option A

Explanation:

No answer description available for this question.

Question: If a number of forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are not in equilibrium.
[A].

Agree

[B].

Disagree

Answer: Option B

Explanation:

No answer description available for this question.

Question: If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.
[A].

change

[B].

does not change

Answer: Option B

Explanation:

No answer description available for this question.

Question: According to lami’s theorem
[A].

the three forces must be equal

[B].

the three forces must be at 120° to each other

[C].

the three forces must be in equilibrium

[D].

if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

Answer: Option D

Explanation:

No answer description available for this question.

Question: Non-coplaner non-concurrent forces are those forces which
[A].

meet at one point, but their lines of action do not lie on the same plane

[B].

do not meet at one point and their lines of action do not lie on the same plane

[C].

do not meet at one point but their lines of action lie on the same plane

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: Non-coplaner concurrent forces are those forces which
[A].

meet at one point, but their lines of action do not lie on the same plane

[B].

do not meet at one point and their lines of action do not lie on the same plane

[C].

meet at one point and their lines of action also lie on the same plane

[D].

do not meet at one point, but their lines of action lie on the same plane

Answer: Option A

Explanation:

No answer description available for this question.

Question: Coplaner concurrent forces are those forces which
[A].

meet at one point, but their lines of action do not lie on the same plane

[B].

do not meet at one point and their lines of action do not lie on the same plane

[C].

meet at one point and their lines of action also lie on the same plane

[D].

do not meet at one point, but their lines of action lie on the same plane

Answer: Option C

Explanation:

No answer description available for this question.

Question: According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.

Question: Energy may be defined as the capacity of doing work.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.