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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

Which of the following is a vector quantity___________________?
A energy
B mass
C momentum
D angle
Correct Answer: momentum
The forces, which meet at one point, but their lines of action do not lie in a plane, are called_________________?
A coplanar non-concurrent forces
B non-coplanar concurrent forces
C non-coplanar non-concurrent forces
D intersecting forces
Correct Answer: non-coplanar concurrent forces
Two non-collinear parallel equal forces acting in opposite direction__________________?
A balance each other
B constitute a moment
C constitute a couple
D constitute a moment of couple
Correct Answer: constitute a couple
Which of the following is not a vector quantity __________________?
A weight
B velocity
C acceleration
D force
Correct Answer: weight
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if____________________?
A the floor is smooth, the wall is rough
B the floor is rough, the wall is smooth
C the floor and wall both are smooth surfaces
D the floor and wall both are rough surfaces
Correct Answer: the floor and wall both are smooth surfaces
If a rigid body is in equilibrium under the action of three forces, then _____________________?
A these forces are equal
B the lines of action of these forces meet in a point
C the lines of action of these forces are parallel
D B. and C. above
Correct Answer: B. and C. above
According to principle of moments__________________?
A if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
B if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
C the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
D positive and negative couples can be balanced
Correct Answer: if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
A number of forces acting at a point will be in equilibrium if_____________________?
A their total sum is zero
B two resolved parts in two directions at right angles are equal
C sum of resolved parts in any two per-pendicular directions are both zero
D all of them are inclined equally
Correct Answer: sum of resolved parts in any two per-pendicular directions are both zero
According to principle of transmissibility of forces, the effect of a force upon a body is_________________?
A maximum when it acts at the center of gravity of a body
B different at different points in its line of action
C the same at every point in its line of action
D minimum when it acts at the C.G. of the body
Correct Answer: the same at every point in its line of action
Friction force for dry surfaces. Friction force is________________?
A proportional to normal load between the surfaces
B dependent on the materials of contact surface
C proportional to velocity of sliding
D independent of the area of contact surfaces
Correct Answer: proportional to velocity of sliding
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