Question Bank • QB_EXP_FM_ROT_001 MCQ • 1 Mark

Section 2: Farm Machinery

Rotary Tillage: Rotavators & Blade Kinematics

Subtopic: Rotor speed and peripheral velocity

Question Statement:

A tractor-operated rotavator has a rotor radius of $0.25\text{ m}$ and rotates at $190\text{ rpm}$. The peripheral tip velocity of the rotavator blades is:

Options:

  • (A) $4.97\text{ m/s}$
  • (B) $7.46\text{ m/s}$
  • (C) $3.48\text{ m/s}$
  • (D) $9.94\text{ m/s}$

Answer Key:

A

Step-by-Step Solution & Explanation

The peripheral velocity $u$ of the rotor blades is given by: $u = \omega R = \frac{2 \pi N}{60} R$ Given $N = 190\text{ rpm}$ and $R = 0.25\text{ m}$: $u = \frac{2 \times \pi \times 190 \times 0.25}{60} = 4.97\text{ m/s}$ Hence, the blade tip speed is $4.97\text{ m/s}$.
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