Session 5: Removal and Replacement of Damaged Fasteners
Unit 2: Fasteners
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. In automobile screws get broken due to ……………. vibrationand……………
Ans: excessive, over tightening
2. To remove a spoiled headed screw use hacksaw …………… and dress the………
Ans: blade, groove
3. In automobile, due to …………… movement and vibration, nutsand bolt get……………
Ans: continuous, loosened
4. A stud is stronger than a…………….
Ans: bolt
5. Anti-rust solution is used for dissolving the …………….. in thefastener.
Ans: rust
B. Multiple choice questions
1. For removing a spoiled headed screw…………….
(a) use hacksaw blade and dress the groove.
(b) remove the screw, if it does not respond
(c) Both of the above
(d) None of the above
Ans: (c) Both of the above
2. Remove unheaded screw if………………(a) the screw is broken at the top of the assembly
(b) the other screw and separate the assembly
(c) comes out
(d) All of the above
Ans: (d) All of the above
3. How to remove an unheaded screw broken in the assembly?
(a) Dress the threads before fixing new screw
(b) Drill in to the centre of screw, it will be removed
(c) Use drill machine with a smaller drill bit than that of the screw(d) All of the above
Ans: (d) All of the above
C. Answer the following questions
1. Give the process of removing screw with spoiled head.
Ans: First apply penetrating oil to the screw. Cut a straight groove on thespoiled head using a hacksaw blade. Fit a suitable flat screwdriver into thegroove and turn it slowly to remove the screw.
2. How is a screw without head removed?
Ans: A screw without head can be removed by gripping the exposedportion with pliers and turning it anticlockwise. Penetrating oil may be appliedto ease removal.
3. List the steps to remove unheaded screw broken in the assembly.
Ans: First drill a small hole at the centre of the broken screw. Use a drill bit smaller than the screw size. Remove the screw carefully and dress thethreads before fixing a new screw.
4. Give the steps to remove broken or spoiled threaded studs.
Ans: Apply anti-rust solution on the stud and allow it to soak. Use twonuts locked together on the stud and turn the lower nut to remove it. If required, heat may be applied carefully to loosen the stud.
