घर्षण कोण 30° व वर्गाकार चूड़ियों वाले एक स्क्रू जैक की अधिकतम दक्षता क्या होगी?

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NPCIL ST ME (07/11/2019, Shift-2)
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  1. 11%
  2. 20%
  3. 30%
  4. 33%

Answer (Detailed Solution Below)

Option 4 : 33%
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Detailed Solution

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Concept:

स्क्रू जैक की अधिकतम दक्षता है:

\(\eta = \frac{{1 - sin\phi }}{{1 + sin\phi }} \)

Calculation:

Given:

\(\eta = \frac{{1 - sin\phi }}{{1 + sin\phi }} = \frac{{1 - \sin 30^\circ }}{{1 + \sin 30^\circ }} = \frac{{1 - \frac{1}{2}}}{{1 + \frac{1}{2}}} = \frac{1}{3} = 33.3\% \)

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