यदि एक खोखले शाफ्ट का बाहरी व्यास उसके आंतरिक व्यास से तीन गुना अधिक है, तो समान पदार्थ और समान बाहरी व्यास वाले ठोस शाफ्ट की तुलना में उसकी टॉर्क-वाहक क्षमता का अनुपात क्या है?

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RRB JE ME 22 Apr 2025 Shift 2 CBT 2 Official Paper
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  1. 65/81
  2. 80/81
  3. 26/27
  4. 81/80

Answer (Detailed Solution Below)

Option 2 : 80/81
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सिद्धांत:

शाफ्ट की टॉर्क क्षमता उसके ध्रुवीय जड़त्व आघूर्ण के समानुपाती होती है:

\( T \propto \frac{\pi}{16}(D^4 - d^4) \)

दिया गया है:

  • ठोस शाफ्ट: \(T_s = \frac{\pi}{16}D^4\)
  • खोखला शाफ्ट: d = D/3

खोखले शाफ्ट का टॉर्क:

\( T_h = \frac{\pi}{16}(D^4 - (D/3)^4) = \frac{\pi}{16}D^4(1 - 1/81) = \frac{\pi}{16}D^4 \times \frac{80}{81} \)

\( \frac{T_h}{T_s} = \frac{80}{81} \)

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