Allied & ICAR Exam Bank • ALLIED_1969MCQ • 2 Marks
Section 8: General Aptitude
Analytical & Spatial Aptitude
Subtopic: Spatial Reasoning & 3D Representations
Question Statement:
What is the primary mechanical function of an idler gear inserted between a driving gear and a driven gear in a simple gear train?
Options:
(A) To change the direction of rotation without changing the overall speed ratio
(B) To increase the torque ratio
(C) To double the output RPM
(D) To eliminate backlash completely
Answer Key:
A
Step-by-Step Solution & Explanation
An idler gear changes the rotational direction of the follower and bridges center distance, but its tooth count cancels out of the overall gear ratio calculation.