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# Engineering Mechanics 2021 (Even) question paper | Sbte Bihar

1. A zero angle of friction implies that:
• Fictional force is infinite
• Fictional force acts normal to the plane
• Frictional force along the direction of motion
• Frictional force is zero

2. A body of weight 'W' is placed on a rough inclined plane. The inclination of the plane with the horizontal is less than the angle of friction. The body is less than angle of friction. The body will :

• Move downwards
• Move upwards
• Be in equilibrium
• None of the above

3. Coulomb friction is the friction between ____ surface.

1. Bet
2. Dry
3. Both 1 and 2
4. None of the above

4. A 1 kg block is resting an a horizontal surface with coefficient of friction u = 0.1. A force of 0.8N is applied to each block parallel to the horizontal plane. The frictional forces is :

• 0.98 N
• 1.2 N
• 0.8 N
• Zero

5. First moment of an area about x - axis is _____.

• xdA
• ydA
• zdA
• y²dA

6. The position of centre of gravity of a solid hemisphere of radius 'r' lies on the control radius at a distance _____ from the plane base.

• 3r/8
• 3r/4
• 3r/5
• r/2

7. The centre of gravity of a solid circular cone divides the axis in the ratio of ______.
• 4:1
• 1:2
• 3:1
• 1:4

8. The centroid of a triangle is the point of intersection of its _______ .

• Altitudes
• Bisector of angles
• Medians
• All of the above

9. If the efficiency of a lifting machine is kept constant, its velocity ratio is _____ to its mechanical advantages.

• Inversely proportional
• Directly proportional
• Both a and b
• None of these

10. The law of machines is an equation that shows the relation between :

• Efficiency and velocity ratio
• Mechanical advantage and velocity ratio
• Effort and velocity ratio
• Effort applied and load lifted

11. A weight of 1 kilo newton is lifted by an effort of 80 Newton. If the velocity ratio is 20, then machine is :

• Ideal
• Reversible
• Non reversible
• None of these

12. The velocity ratio of a single purchase winch crab can be increased by ______.

• Increasing the radius of the load drum.
• Increasing the number of teeth of the pinion.
• Increasing the length of the handle.
• All of the above

13. A beam supported on more than two supporters is called :

• Fixed beam
• Continuous beam
• Overhanging beam
• Simply supported beam

14. The number of reaction possible at hinge support for the general loading are:

• 4
• 3
• 2
• 1

15. The moment of a couple is a ______.

• Fixed vector
• Bound vector
• Free vector
• Sliding vector

16. The forces, whose lines of action are parallel to each other and act in the same directions are known as :

• Unlike parallel forces
• Like parallel forces
• Coplanar concurrent forces
• Coplanar non concurrent forces

17. The resultant of two equal forces 'P' acting at angle A is:

• 2Psin A/2
• 2Ptan A/2
• 2Pcot A/2
• 2Pcos A/2

18. A force acting on a body may _____.

• Retard its motion
• Induce internal stress
• Charge its motion
• All of the above

19. A number of forces are acting at a point to keep the body in equilibrium, then ______ .

• Sum of the forces is zero
• Algebraic sum of the forces is zero
• Sum of the resolved part is zero
• Sum of the resolved parts in any two mutually perpendicular direction is zero.

20. Principle of transmissibility for free body diagram.

1. States that the forces acting on the body is a rolling vector.
2. States that the force acting on the body is a sliding vector.
3. Both 1 and 2
4. None of these