Characteristic & application of springs

Q.  Which of the following statements is/are true?

1. In volute springs, number of active coils gradually decreases as load increases
2. Stiffness of spring decreases as number of coils decreases in conical springs
3. Torsion springs are generally spiral
4. Helical torsion springs are used in automobile starters
- Published on 14 Sep 15

a. Statements 1 and 3
b. Statements 2, 3 and 4
c. Statements 1, 3 and 4
d. All of the above

ANSWER: Statements 1, 3 and 4

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    Discussion

  • Sravanthi   -Posted on 06 Nov 15
    - Spring: An elastic or resilient body which deforms or deflects when load is applied and regains its original shape when load is removed is called as spring.

    - Conical and volute springs: In these springs, when load increases number of active coils decrease gradually. As the number of coils decreases, stiffness of spring increases.

    - Torsion springs: These springs are used in door-hinges or automobile starters. They are used to apply small torque and are generally helical or spiral in shape. These springs are used wherever torsional or rotational force is required. These springs are created to store and release angular energy. They also statistically hold a mechanism by deflecting legs about the body centre line.

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