Multiple choice general knowledge science & technology

What is a bearing pressure in a journal bearing (width 30 mm and Dia 20 mm) subjected to shaft load of 40N.

  1. 40x 20 x 30

  2. 40/(20x30)

  3. 40/(3.14 x 20 x 20/4)

  4. 40 x (3.14 x 20 x 20/4)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bearing pressure is calculated as load divided by projected bearing area. For a journal bearing, the projected area is diameter times width (not the circular cross-sectional area). So pressure = 40N/(20mm × 30mm) = 40/(20×30) N/mm².

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