Allied & ICAR Exam Bank • ALLIED_0066 MCQ • 1 Mark

Section 1: Engineering Mathematics

Differential Equations

Subtopic: Laplace transforms and their inverse

Question Statement:

The Laplace transform of $f(t) = e^{3t} \sin(4t)$ for $s > 3$ is:

Options:

  • (A) $\frac{4}{(s-3)^2 + 16}$
  • (B) $\frac{s-3}{(s-3)^2 + 16}$
  • (C) $\frac{4}{s^2 + 16}$
  • (D) $\frac{s+3}{(s+3)^2 + 16}$

Answer Key:

A

Step-by-Step Solution & Explanation

Using first shift theorem: $\mathcal{L}\{\sin(4t)\} = \frac{4}{s^2 + 16} \implies \mathcal{L}\{e^{3t}\sin(4t)\} = \frac{4}{(s-3)^2 + 16}$.
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