Session 4: Automotive Washers and Rivets
Unit 2: Fasteners
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. A washer is a thin ……………. with a hole that is normally usedto …………… the load of a threaded ……………..
Ans: plate, distribute, fastener
2. Automotive washers are small flat …………………. with a………….. in the center.
Ans: discs, hole
3. Rivets are ……………. mechanical fasteners.
Ans: non-threaded
4. Rivets are categorised on the basis of their……………
Ans: head shape
5. Circlips are often used to secure……………..
Ans: shafts or components
6. Split pins are typically made of ………….. metal, making themeasy to ………… and remove.
Ans: soft, bend
7. Spring pins have a body diameter which is larger than the…………….. diameter, and a …………… one or both ends to facilitate……………. the pin into the hole.
Ans: hole, chamfer on, inserting
B. Multiple choice questions
1. A washer is used to distribute the load of a………………..
(a) screw or nut
(b) chassis
(c) wheel
(d) None of the above
Ans: (a) screw or nut
2. A washer’s outer diameter (OD) is twice the width oftheir……………..
(a) inner diameter
(b) pitch
(c) flank
(d) None of the above
Ans: (a) inner diameter
3. Which of these is a flat washer?
Ans: (a)
4. Which of the following type of washers is used in timberconstruction?
(a) Square
(b) Dock
(c) Ogee
(d) Split lock
Ans: (a) Square
5. Which of the following is a semi-permanent mechanical fastener?(a) Rivet
(b) Nut and bolt
(c) Studs
(d) None of the above
Ans: (a) Rivet
C. Answer the following questions
1. Describe the importance of washers.
Ans: Washers are used to distribute the load of a nut or bolt over a largerarea. They protect the surface from damage, prevent loosening, and help inachieving proper tightening of fasteners.
2. What is the importance of rivets?
Ans: Rivets are important for making permanent or semi-permanent joints. They are widely used where welding is not possible and provide strong, vibration-resistant joints in sheet metal work.
3. What are the advantages of using washers as fasteners?
Ans: Washers reduce surface damage, distribute load evenly, prevent loosening due to vibration, and improve the life of nuts and bolts.
4. In what conditions should rivets be used as fasteners?Ans: Rivets should be used where permanent joints are required, whereaccess is available only from one side, and where vibration resistance isnecessary.
5. What are the advantages of using split pin as fastener?Ans: Split pins are simple, low-cost fasteners that prevent nuts fromloosening. They are easy to install, remove, and reuse.
6. What are the advantages of using spring pin as fastener?
Ans: Spring pins provide strong holding force, absorb shock and vibration, and can compensate for slight hole misalignment.
7. Name different types of washers.
Ans: Flat washer, spring washer, split lock washer, square washer, andtoothed washer.
8. Name different types of rivets.
Ans: Solid rivet, blind rivet, tubular rivet, and semi-tubular rivet.
9. List the uses of circlip.
Ans: Circlips are used to locate and retain components on shafts or insidebores, prevent axial movement of parts, and secure bearings and gears
