GATE AG 2025 • Q21 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: I.C. engine cycles

Question Statement:

By tripling the RMS sound pressure, the resulting increase in sound pressure level (dB) is closest to:

Options:

  • (A) 9.54
  • (B) 6.02
  • (C) 4.77
  • (D) 3.01

Official Answer Key:

A

Step-by-Step Solution & Explanation

Sound pressure level: ΔdB = 20 log₁₀(p₂/p₁) = 20 log₁₀(3) = 20×0.4771 = 9.54 dB.

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