EIT Statics, Dynamics & Mechanics of Materials 2

Question 1

A uniform beam of weight W is supported by a pin at A and a roller at B. If a concentrated load P acts at the midspan, what is the vertical reaction at B?

Accepted Answer

All of the above are equivalent

Answer

All three expressions are mathematically identical, equaling (W+P)/2 by symmetry of a simply supported beam with midspan load.

Question 2

Which condition must be satisfied for a body to be in static equilibrium in 2D?

Accepted Answer

ΣFx=0, ΣFy=0, and ΣM=0

Answer

2D static equilibrium requires three independent equations: sum of forces in x, sum of forces in y, and sum of moments about any point all equal zero.

Question 3

A particle moves along a straight line with acceleration a = 4t m/s². If the initial velocity is 2 m/s, what is the velocity at t = 3 s?

Accepted Answer

20 m/s

Answer

Integrating a=4t gives v = 2t² + C; with v₀=2 m/s, v = 2(9)+2 = 20 m/s at t=3 s.

Question 4

The modulus of resilience is defined as the strain energy per unit volume up to the:

Accepted Answer

Yield point

Answer

Modulus of resilience is the area under the stress-strain curve up to the yield point, representing elastic energy storage capacity.

Question 5

For a hollow circular shaft in torsion, which parameter most directly increases torsional stiffness?

Accepted Answer

Increasing polar moment of inertia J

Answer

Torsional stiffness = GJ/L; increasing the polar moment of inertia J directly increases stiffness.

(EIT) Engineer In Training Certification Practice Test

(EIT) Engineer In Training Certification Practice Test

EIT Statics, Dynamics & Mechanics of Materials 2