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Question

A technician measures only the outside diameter of a rim. What mistake has been made in defining the rim size?

This question was previously asked in
RRB ALP 2025 CBT 2 Mechanic Motor Vehicle Question Paper (28-Jul-2026) (Shift 1)
The correct answer is

Omitted the width of the rim

To determine the correct size of a rim, a technician must consider several factors, not just the outside diameter. Let's evaluate the options provided and verify why "Omitted the width of the rim" is the correct answer.

  1. Measured the inner circumference: This option suggests a focus on the inner measurements, while the issue here is with the outer diameter. Hence, this is not the mistake made.
  2. Used tyre sidewall measurement: The sidewall measurement is different and relates to the tire's overall diameter but does not define the rim size. Therefore, this is not relevant to the mistake in question.
  3. Omitted the width of the rim: The technician is supposed to measure not only the outside diameter but also the width of the rim for a complete and accurate rim size specification. Omitting the rim width results in an incomplete description of the rim. Therefore, this is the correct answer.
  4. Included tread depth only: Tread depth is a measurement related to tires and not directly to the rim size. Hence, it doesn't apply here.

When correctly defining a rim size, both the diameter and the width are crucial. The rim size can be represented as Diameter x Width (e.g., 17x8 inches indicates a 17-inch diameter and 8-inch width). Omitting the width would prevent complete characterization of the rim's dimensions, leading to potential misunderstandings or errors in compatibility with tires or vehicles.

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