This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Conventional Symbols for Nuts and Bolts”.
1. Which of the following is the conventional representation of hexagonal headed bolt?
a) 
b) 
c) 
d) 
View Answer
Explanation: Hexagonal headed bolt is conventionally represented by the hexagon with no cross marks which represent slots. The shape of the bolt is hexagon which aids in the grip of the tools used to operate.
2. What does the following conventional representation represent?
a) Cylindrical screw cross slot
b) Hexagonal socket bolt
c) Cylinder screw pan head type slot
d) Countersunk headed screw slot
View Answer
Explanation: The hexagonal socket bolt has the circular bolt head with a hexagon drive hole. The hex drive helps in operating. These are used where clearance is very small and not sufficient for the conventional wrench.
3. Which of the following indicates the set screw slot?
a)
b)
c) 
d) 
View Answer
Explanation: Set screws generally do not have a head and a nut. They are also called as blind for that reason, they are threaded all along its length. It prevents relative motion between two pieces which are joined.
4. What does the following conventional representation represent?
a) Set screw cross slot
b) Square-headed bolt
c) Wing screw
d) Countersunk headed screw slot
View Answer
Explanation: The square-headed bolt has a bolt head in square shape. They can be tightened higher than the hexagonal headed bolt and are used in agriculture, industries and construction applications.
5. What does the following conventional representation represent?
a) Set screw cross slot
b) Square-headed bolt
c) Wing screw
d) Countersunk headed screw slot
View Answer
Explanation: Wing screw has a wing grip that helps in manual operating. These are used where frequent adjustments are required.
6. Which of the following represent the square nut?
a)
b) 
c)
d)
View Answer
Explanation: The square nut has the four sides and has more surface area contact with bolt threads than the hexagonal nut hence they can be highly tightened than the hex nuts.
7. What does the following conventional representation represent?
a) Set screw cross slot
b) Square-headed bolt
c) Wood and self-tapping screw slot
d) Countersunk headed screw slot
View Answer
Explanation: Self-tapping tap their own thread into some soft materials like wood, all we need to do is to drill a pilot hole with a diameter smaller than the screw diameter.
8. Which of the following represents the crown nut?
a)
b)
c)
d)
View Answer
Explanation: Crown nut is also called castellated nut sometimes, as its head has slots which resemble the crown or the castle outline shape. These are used in low-torque applications.
9. Which of the following is called wing nut?
a)
b) 
c)
d)
View Answer
Explanation: Wing nut has the two wings on each side for easy adjustments and operations. A line on the circle indicate the wings. These are used where frequent adjustments are required.
10. What does the following conventional representation represent?
a) Set screw cross slot
b) Square-headed bolt
c) Wood and self-tapping screw slot
d) Countersunk headed screw cross slot
View Answer
Explanation: The head of the countersunk is conical with a flat outer face. The inner face is tapered and the angle of the screw is the full angle of the conical head.
11. What does the following conventional representation represent?
a) Cylindrical screw cross slot
b) Hexagonal socket bolt
c) Cylinder screw pan head type slot
d) Hexagonal headed bolt
View Answer
Explanation: Hexagonal headed bolt is conventionally represented by the hexagon from the side view. The shape of the bolt is hexagon which aids in the grip of the tools used to operate.
12. What does the following conventional representation represent?
a) Cylindrical screw cross slot
b) Hexagonal socket bolt
c) Hexagonal nut
d) Hexagonal headed bolt
View Answer
Explanation: Hexagonal nut is conventionally represented by the hexagon from the side view. The shape of the nut is hexagon with internal threads.
13. What does the following conventional representation represent?
a) Cylindrical screw cross slot
b) Oval countersunk screw
c) Cylinder screw pan head type slot
d) Countersunk headed screw slot
View Answer
Explanation: The given figure is cylindrical screw with the head having low disc outer edge which resembles the pan head. Hence it is representing cylinder screw pan head type slot.
14. What does the following conventional representation represent?
a) Cylindrical screw cross slot
b) Oval countersunk headed screw
c) Cylinder screw pan head type slot
d) Countersunk headed screw slot
View Answer
Explanation: The head of the countersunk is conical with a flat outer face. The inner face is tapered and the angle of the screw is the full angle of the conical head. For the given figure we have an oval top with the countersunk bottom, hence it is an oval countersunk headed screw.
15. Which of the following represent the countersunk headed screw with cross slot?
a) 
b)
c) 
d)
View Answer
Explanation: The head of the countersunk is conical with a flat outer face. The inner face is tapered and the angle of the screw is the full angle of the conical head. The cross marks in the side view indicate the cross slot.
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