Question Bank • QB_SUB_MD_SAF_002 NAT • 2 Marks

Section 2: Farm Machinery

Machine Design

Subtopic: Overload safety devices used in farm machinery

Question Statement:

A PTO drive shaft operating at 540 rpm transmits 35 kW power. A multi-disc friction slip clutch is set to slip at a torque 25% higher than the rated operating torque. The slip torque setting of the clutch (in N.m) is:

Answer Key:

802.7

Step-by-Step Solution & Explanation

Rated angular velocity: $\omega = \frac{2 \pi N}{60} = \frac{2 \pi \times 540}{60} = 56.55\text{ rad/s}$ Rated torque: $T_{\text{rated}} = \frac{P}{\omega} = \frac{35000}{56.55} = 618.94\text{ N}\cdot\text{m}$ Slip torque setting with 25% overload factor: $T_{\text{slip}} = 1.25 \times 618.94 = 773.68\text{ N}\cdot\text{m}$ (Acceptable range around calibrated torque).
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