engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test Design of Machine Elements Power Screws Efficiency of Screws

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

1
11%
2
20%
3
30%
4
33%
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