EIT Statics, Dynamics & Mechanics of Materials 3

Question 1

A simply supported beam with span L carries a uniformly distributed load w. What is the maximum bending moment?

Accepted Answer

wL²/8

Answer

For a UDL on a simply supported beam, the maximum moment occurs at midspan and equals wL²/8.

Question 2

A rigid body undergoes pure rotation about a fixed axis. The relationship between tangential acceleration (aₜ) and angular acceleration (α) for a point at radius r is:

Accepted Answer

aₜ = rα

Answer

Tangential acceleration aₜ = rα, while the normal (centripetal) acceleration is rω².

Question 3

Which type of support provides both a horizontal reaction and a vertical reaction but no moment reaction?

Accepted Answer

Pin support

Answer

A pin (hinge) support resists translation in all directions (provides Rx and Ry) but allows rotation, so it provides no moment reaction.

Question 4

The section modulus S for a rectangular cross-section (width b, height h) is:

Accepted Answer

bh²/6

Answer

S = I/c = (bh³/12)/(h/2) = bh²/6, used to compute bending stress σ = M/S.

Question 5

Work-energy theorem states that the net work done on a particle equals its change in:

Accepted Answer

Kinetic energy

Answer

The work-energy theorem: W_net = ΔKE = ½mv₂² – ½mv₁², directly linking net work to kinetic energy change.

(EIT) Engineer In Training Certification Practice Test

(EIT) Engineer In Training Certification Practice Test

EIT Statics, Dynamics & Mechanics of Materials 3