Question

The speed ratio of ground wheel to metering wheel will be

• A. 1.40 : 1
• B. 2.52 : 1
• C. 3.64 : 1
• D. 4.76 : 1

Hint:

Speed ratio = (travel distance / ground wheel circumference) ÷ (material required / discharge per revolution).

Answer 1

The Correct Option is B

Step 1: Fertilizer requirement per hectare.
Application = 200 kg/ha = 200,000 g/ha

Step 2: Fertilizer delivered per revolution of metering wheel.
One revolution delivers 38 g per row.
Row spacing = 40 cm → 1 ha has \(10000 / 0.40 = 25000\) row-meters.

Step 3: Total revolutions needed.
Total revolutions = 200000 / 38 = 5263.16

Step 4: Ground wheel circumference (D=60 cm).
\[ C = \pi D = 3.14 \times 0.60 = 1.884\ \text{m} \] Total distance = 25000 m.
Ground wheel revolutions = 25000 / 1.884 = 13271.7

Step 5: Speed ratio.
\[ \text{Speed ratio} = \frac{\text{Ground wheel rev}}{\text{Metering wheel rev}} = \frac{13271.7}{5263.16} = 2.52 \]

Final Answer: (B) 2.52 : 1