Allied & ICAR Exam Bank • ALLIED_1061 NAT • 2 Marks

Section 2: Farm Machinery

Machine Design

Subtopic: Power Transmission Elements

Question Statement:

A solid steel shaft transmitting power in a rotary tiller must transmit a torque of 350 N$\cdot$m. If the allowable shear stress for the shaft material is 50 MPa, the minimum required shaft diameter (in mm) based on torsional shear is:

Answer Key:

33.0

Step-by-Step Solution & Explanation

Torsion equation: $\tau = \frac{16 T}{\pi d^3} \implies d = \left(\frac{16 T}{\pi \tau}\right)^{1/3} = \left(\frac{16 \times 350}{\pi \times 50 \times 10^6}\right)^{1/3} = (3.565 \times 10^{-5})^{1/3} \approx 0.0329\text{ m} = 32.9\text{ mm}$.
← Previous (ALLIED_1060) Next (ALLIED_1062) →

Practice In Authentic CBT Exam Interface

Test your skills under authentic timed conditions with live scoring and AIR percentile ranking.

Launch CBT Mock Test