Q: If α' is the helix angle and '?' is the angle of friction then, when will the efficiency of a screw jack be maximum? यदि किसी स्क्रू जैक का हेलिक्स कोण 'α' है और घर्षण कोण '?' है, तो स्क्रू जैक की दक्षता कब अधिकतम होगी?
A.
α = 90⁰ + ?
B.
α = 45⁰ + (?/2)
C.
α = 45 – ((?/2)
D.
α = 90⁰ – ?
Correct Answer:
Option C -
Explanations:
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