You have completed the syllabus of the RVUNL exam for Engineering Mechanics. Now BYJU'S Exam Prep brings you the 100 most important questions of the Engineering Mechanics subject.
Here you will find the 100 most important questions for the Engineering mechanics subject of the Mechanical Engineering syllabus. The top 10 questions are attached here rest questions you can find in the below pdf.
1.Limiting force of friction is the
A. Tangent of the angle between a normal reaction and the resultant of normal reaction and limiting friction.
B. Ratio of limiting friction and normal reaction.
C. The friction force acting when the body is just about to move.
D. The friction force acting when the body is in motion.
- The limiting force of friction is the friction action on the body when the body is just about to move. It is also known as maximum static friction.
2.Method of sections is more suitable when____.
A. Only reactions at the supports are desired.
B. Only forces in a few of the members are desired.
C. Only forces in a few of the members away from the supports are desired.
D. forces in all the members are desired.
- Method of section becomes more useful when forces in members away from the supports need to be found.
- The forces in selected members can be found directly without finding forces in all members.
3.Concurrent force system is the system when _________.
A.Lines of action of all forces pass through a point
B. Lines of action of all forces are parallel to each other
C. Lines of action of all forces lie along the same line
D. Lines of action of all forces are not parallel to each other
- A concurrent force system is a type of system of forces in which the line of action of all the forces meets at a point.
- If the line of action of forces lies along the same line known as the collinear system of forces.
4.The value of the coefficient of restitution for perfectly inelastic collision
For a perfectly inelastic collision,
Velocity of separation = 0
Therefore, the value of the coefficient of restitution is 0 for perfectly inelastic collision.
5.For a cam having simple motion described as simple harmonic motion having ascent-dwell1-descent-dwell2 nature, if the angle for ascent is 65 angle for descent is 85 and dwell1 is 50 find the angle for dwell2 in degree.
We know that
ascent + dwell1 + descent + dwell2 = 360º
65 + 85 + 50 + dwell2 = 360º
dwell2 = 160º
6.A spring controlled governor is said to be stable if controlling force (F) and the radius of rotation (r) obey the relation (where a and b are constants):
A.F = ar
B. F = ar +b
C. F = arb
D. F = a/r
A spring controlled governor is stable when F = ar –b
When F = ar, then the governor is isochronous
When F = ar + b, then governor is unstable.
7.The follower starts from rest at the beginning and it comes to rest at end of the stroke. During its travel the follower may follow approximately with of the following motion :
D. All of these
The follower follows any one of these motions during its complete travel from the beginning of the stroke to the end of the stroke. It may also follow uniform acceleration or retardation.
8. Gyroscopic effect will be Zero in case of_____.
A.Steering during ship turns left
B. Steering during ship turns right
C. Ship during pitching
D. Ship during rolling
Sol -As the axes of the rolling of the ship and that of the rotor are parallel, there is no precession of the axis of spin and thus there is no gyroscopic effect.
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