Allied & ICAR Exam Bank • ALLIED_2446 MCQ • 2 Marks

Section 8: General Aptitude

Analytical & Spatial Aptitude

Subtopic: Spatial Reasoning & 3D Representations

Question Statement:

A compound gear train consists of: Driver A (20 teeth) meshing with B (40 teeth). Gear B is keyed to the same shaft as C (15 teeth), which meshes with D (60 teeth). What is the overall velocity ratio (N_A / N_D)?

Options:

  • (A) 8
  • (B) 4
  • (C) 6
  • (D) 2

Answer Key:

A

Step-by-Step Solution & Explanation

Velocity ratio = (T_B / T_A) * (T_D / T_C) = (40 / 20) * (60 / 15) = 2 * 4 = 8.
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