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The Efficiency of a Screw Jack is Maximum When
By BYJU'S Exam Prep
Updated on: September 25th, 2023
The efficiency of a screw jack is maximum when, α = Helix angle and Φ = Angle of friction
A. α = 45º + Φ/2
B. α = 45º – Φ/2
C. α = 90º + Φ
D. α = 90º – Φ
Find the correct answer from the given option and also provide a detailed solution.
Table of content
Answer: (B) – α = 45º – Φ/2
The efficiency of a screw jack is maximum when, α = 45º – Φ/2
Solution:
To get higher efficiency square threads can be provided in the screw jack. Due to the used of square thread instead of V-thread or Thrapezoidal shapes threads, it makes screw jack self locking
The efficiency of screw jack is given by
η = (1 – SinΦ)/(1+ SinΦ)
For the maximum effeciency of screw jack
α = 45º – Φ/2
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