Question Bank • QB_FM_083 NAT • 1 Mark

Section 2: Farm Machinery

Machine Design

Subtopic: Design and selection of machine elements – gears, pulleys, chains and sprockets and belts

Question Statement:

A chain drive connects a 15-tooth driving sprocket on an electric motor to a 45-tooth driven sprocket on a feed grinder. If the motor runs at $1440\text{ rpm}$, calculate the rotational speed of the feed grinder shaft in $\text{rpm}$.

Answer Key:

480

Step-by-Step Solution & Explanation

Speed ratio of chain drive: $\frac{N_1}{N_2} = \frac{T_2}{T_1}$ $N_2 = N_1 \times \frac{T_1}{T_2} = 1440 \times \frac{15}{45} = \frac{1440}{3} = 480\text{ rpm}$
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