Chapter6: Engineering tool_part2

What is the purpose of countersinking in mechanical work?

• To create a decorative pattern

• To allow the head of a rivet or screw to sit flush with or below the surface of the material

• To make the material lighter

• To increase the material's strength

Why are centre drills unsuitable for countersinking?

• They create too large a hole

• They have a 90-degree angle

• They have a 60-degree angle

• They are too expensive

What is the difference between a countersink and a counterbore?

• A counterbore is used for lighter materials

• A countersink creates a conical hole, while a counterbore creates a cylindrical hole

• A countersink is only used on metal surfaces

• A counterbore is less precise

What is the function of spot-facing?

• To create a deep hole in the material

• To make the surface rough

• To provide a flat surface for a nut or washer to seat on

• To connect two pieces of material

What is the most common type of accident resulting from the use of an unguarded drilling machine?

• Electrical shock

• Fire hazard

• Machine malfunction

• Injury

Which type of screw threads are stronger and less likely to work loose in soft metals like aluminium?

• Coarse threads

• Fine threads

• Both A and B

• Neither A nor B

What is the primary reason for using a hexagon head on a bolt?

• To increase the weight of the bolt

• To provide a flush surface for safety

• To make it look more appealing

• To allow for ease of tightening and application strength

Which type of bolt is commonly used in the manufacture of machine tools, jigs, and fixtures?

• Hexagon head bolt

• Cap-head bolt

• Plain shank bolt

• Stud bolt

What is the purpose of recessing the cap-head of a bolt?

• To reduce the cost of production

• To provide a flush surface for safety and easy cleaning

• To increase the bolt's diameter

• To make the bolt longer

What does the metric bolt specification include?

• Color and weight

• Length, width, and height

• Diameter, pitch, and length of a bolt

• Material and cost