Question Bank • QB_FP_058 NAT • 2 Marks

Section 3: Farm Power

Tractors and Power Tillers

Subtopic: Type, selection, maintenance and repair of tractors and power tillers

Question Statement:

A walk-behind two-wheel power tiller equipped with a rotary tiller attachment moves forward at a speed of $v = 1.8\text{ km/h}$. The tilling rotor rotates at $N = 250\text{ rpm}$. The rotor flanges carry $z = 2$ opposing tines per flange plane. The tilling pitch (forward advance per cut) in $\text{cm}$ is ________ (answer in integer).

Answer Key:

6

Step-by-Step Solution & Explanation

1. Forward speed in $\text{cm/s}$: $v = 1.8 \times \frac{5}{18} = 0.50\text{ m/s} = 50\text{ cm/s}$ 2. Rotor cuts per second per flange: $f = z \times \frac{N}{60} = 2 \times \frac{250}{60} = \frac{500}{60} = \frac{25}{3}\text{ cuts/s}$ 3. Tilling pitch ($p$): $p = \frac{v}{f} = \frac{50}{25/3} = 50 \times \frac{3}{25} = 6.0\text{ cm}$
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