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The maximum efficiency of a screw jack having square threads and friction angle of 30° will be:

This question was previously asked in
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:

The maximum efficiency of screw jack is:

Calculation:

Given:

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More Efficiency of Screws Questions

Q1.A power screw of 32 mm nominal diameter and 5mm pitch is acted by an axial load of 12 kN with permissible thread bearing pressure is 6 MPa. Considering bearing action between the threads in engagement, what is the number of threads in engagement with the screw.
Q2.Between V-threads and Square threads transmitting power of --- threads are preferred.
Q3.A square threaded screw is used to lift a load W by applying a force F. Efficiency of square threaded screw is expressed as
Q4.Square threads are used in which of the following 
Q5.The threads used for transmission of power is
Q6.If α denotes the lead angle and φ denotes the angle of friction, then the efficiency of the screw is given by 
Q7.Square threads are used in screw jacks in automobiles mainly for:
Q8.For power screw applications, a square thread can be preferred to a trapezoidal thread for
Q9.For the same pitch, the efficiency of screw jack with square threads is 

More Power Screws Questions

Q1.The efficiency of a screw jack may be increased by _______.
Q2.For self locking of screws the efficiency cannot be more than
Q3.A power screw of 32 mm nominal diameter and 5mm pitch is acted by an axial load of 12 kN with permissible thread bearing pressure is 6 MPa. Considering bearing action between the threads in engagement, what is the number of threads in engagement with the screw.
Q4.Between V-threads and Square threads transmitting power of --- threads are preferred.
Q5.What is the efficiency of a self-locking power screw?
Q6.Multistart threads are used to get
Q7.In a screw jack, the effort required to lift the load is given by: (where W = Load lifted, α = Helix angle, and φ = Angle of friction) 
Q8.A square threaded screw is used to lift a load W by applying a force F. Efficiency of square threaded screw is expressed as
Q9.The screw jack is an application of which of the following simple machines?
Q10.For applications involving high stresses in one direction only the following types of thread would be best suited
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