The Efficiency of a Screw Jack is Maximum When

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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