Definition of Terms

Question 1

Force per unit area

Answer 1

Simple Stress

Question 2

It is a stress caused by forces acting along or parallel to the areas resisting the force.

Answer 2

Shearing Stress or Tangential Stress

Question 3

It is a stress caused by forces acting perpendicular to the areas resisting the force. Example of this are tensile and compressive stress.

Answer 3

Bearing Stress

Question 4

The stress state leading to expansion; that is, the length of a material tends to increase in the that direction.

Answer 4

Tensile Stress

Question 5

Stress on materials that leads to a smaller volume.

Answer 5

Compressive Stress

Question 6

Ratio of deformation or elongation to the original length

Answer 6

Simple Strain

Question 7

It states that within the elastic limit from point O to the proportional limit, the stress is proportional to strain.

Answer 7

Hooke’s Law

Question 8

Refers to the stress beyond which the material will not return to its original shape when the load is removed. The permanent deformation caused by excessive stress is called Permanent Set.

Answer 8

Elastic Limit

Question 9

Refers to the point where there is an appreciable elongation or yielding of the material even without any corresponding increase in load.

Answer 9

Yield point

Question 10

Refers to the highest ordinate in the stress-strain diagram

Answer 10

Ultimate stress or Ultimate Strength

Question 11

Sometimes known as the stress at failure.

Answer 11

Rapture Strength

Question 12

The maximum safe stress which the material can carry.

Answer 12

Allowable Stress

Question 13

Ratio of ultimate stress to allowable stress

Answer 13

Factor of Safety

Question 14

Angular change between the perpendicular faces of the differential element

Answer 14

Shearing Strain

Question 15

Refers to the modulus of elasticity in Shear

Answer 15

Modulus of rigidity (G)

Question 16

Stress on the material caused by the internal forces due to change in temperature.

Answer 16

Thermal stress

Question 17

Refers to twisting of solid or hollow circular shafts

Answer 17

Torsion

Question 18

“The state of rest or motion of a rigid body is unaltered if a force acting on a body is replaced by another force of same magnitude and direction, but acting anywhere on the body along the line of action of replaced force.”
A. Principle of Transmissibility
B. Varignon’s Theorem
C. D’Alembert’s Principle

Answer 18

A. Principle of Transmissibility

Question 19

This states that the moment of a resultant of two concurrent forces about any point is equal to the algebraic sum of the moments of its components about the same point.
A. Principle of Transmissibility
B. Varignon’s Theorem
C. D’Alembert’s Principle

Answer 19

B. Varignon’s Theorem

Question 20

Alternative form of Newton’s second law of motion. In effect, the principle reduces a problem in dynamics to a problem in statics. In this form, the force F plus the negative of the mass m times acceleration a of the body is equal to zero: F - ma = 0.
A. Principle of Transmissibility
B. Varignon’s Theorem
C. D’Alembert’s Principle

Answer 20

C. D’Alembert’s Principle

Question 21

Graph of catenary, a perfectly flexible uniform cable hanging between two supports.

Answer 21

y=coshx

Question 22

The angle to which an inclined plane may be raised before an object resting on it will move under the action of the force of gravity and the reaction of the plane is

a. angle of elevation
b. angle of inclination
c. angle of repose
d. angle of depression

Answer 22

c. angle of repose

Question 23

The study of motion without reference to the forces which causes the motion

a. kinetics
b. dynamics
c. kinematics
d. statics

Answer 23

c. kinematics

Question 24

The study of projectiles and the extent to which the trajectories are affected by shape, gravity, wind, temp etc,

a. Projectiology
b. Ballistics
c. Aeronautics
d. Streamlining

Answer 24

b. Ballistics