BE/B Eng Bachelor of Engineering Bachelor of Engineering Science 2

Question 1

Which dimensionless number represents the ratio of inertial forces to viscous forces in fluid flow?

Accepted Answer

Reynolds number

Answer

The Reynolds number (Re = ρvL/μ) determines whether flow is laminar or turbulent by comparing inertial to viscous forces.

Question 2

In digital logic, what is the output of a NAND gate when both inputs are HIGH?

Accepted Answer

LOW

Answer

A NAND gate outputs LOW only when all inputs are HIGH; it is the complement of an AND gate.

Question 3

Which material property describes resistance to permanent deformation under stress?

Accepted Answer

Hardness

Answer

Hardness measures a material's resistance to surface indentation or permanent deformation, commonly tested via Vickers or Rockwell methods.

Question 4

What is the primary purpose of a flywheel in a mechanical system?

Accepted Answer

Store rotational kinetic energy

Answer

A flywheel stores rotational kinetic energy (KE = ½Iω²) to smooth out fluctuations in angular velocity.

Question 5

In thermodynamics, a Carnot cycle operating between 600 K and 300 K has a maximum theoretical efficiency of:

Accepted Answer

50%

Answer

Carnot efficiency = 1 − T_cold/T_hot = 1 − 300/600 = 0.50 or 50%.

BE/B Eng Bachelor of Engineering Practice Test