Fundamentals of Engineering Fundamentals of Engineering MCQ 3

Question 1

Which of the following is the correct expression for the efficiency of a Carnot heat engine operating between a hot reservoir at T_H and a cold reservoir at T_C (temperatures in Kelvin)?

Accepted Answer

η = 1 − T_C / T_H

Answer

Carnot efficiency is η = 1 − T_C/T_H, where temperatures must be in absolute (Kelvin) units.

Question 2

A steel rod 2 m long with cross-sectional area 0.001 m² is subjected to a tensile force of 100 kN. If E = 200 GPa, what is the elongation?

Accepted Answer

1.0 mm

Answer

δ = FL/(AE) = 100,000×2/(0.001×200×10⁹) = 200,000/200,000,000 = 0.001 m = 1.0 mm.

Question 3

In digital logic, what is the output of a 3-input AND gate when inputs are A=1, B=0, C=1?

Accepted Answer

0

Answer

An AND gate outputs 1 only when ALL inputs are 1; since B=0, the output is 0.

Question 4

Which law states that the pressure of a fixed amount of gas is inversely proportional to its volume at constant temperature?

Accepted Answer

Boyle's Law

Answer

Boyle's Law states P ∝ 1/V at constant temperature: P₁V₁ = P₂V₂.

Question 5

A projectile is launched horizontally from a height of 20 m. Ignoring air resistance and using g = 10 m/s², how long does it take to reach the ground?

Accepted Answer

2 s

Answer

h = ½gt² → 20 = ½×10×t² → t² = 4 → t = 2 s.

Fundamentals of Engineering Practice Test

Fundamentals of Engineering Practice Test

Fundamentals of Engineering Fundamentals of Engineering MCQ 3