unit 4

3. it is one of the device used to convert rotary motion into translatory motion
5. if the efficiency of screw jack is less than 50% then it is called .
8. multiple thread are used to secure
11. it is defined as load required per unit deflection
14. it is one of the failure of spring
15. when friction angle is less than helix angle then torque required to raise the load is

1. it is one type of spring.
2. it is modification of square thread
4. It is defined as ratio of mean diameter of coil to the diameter of wire.
6. spring length under fully compressed condition.
7. if the efficiency of screw jack is more than 50% then it is called .
9. spring in unloaded condition is known as
10. resultant shear stress is maximum in which edge of spring
12. when friction angle is more than helix angle then torque required to raise the load is
13. it is axial distance between adjacent coil.