GCSE_Unit 5C_Working with Metal

This question is about recycling. Which one of the following statements is true?

• Metals can only be recycled a finite number of times

• Metals must be separated from other materials to be recycled

• Metal recycling is more expensive than mining and refining ore

• Blast furnaces are used to recycle metals

Which one of the following is a suitable finishing technique for use with metal?

• Refining

• Turning

• Brazing

• Galvanizing

Metals are commonly extracted from the earth in the form of ore . Iron ore is taken to a refinery where it is fed into a blast furnace. Explain the process by which the iron is separated from the ore.

The iron from the furnace is very brittle when cooled.

State what causes the iron to be brittle?

• Very High Carbon Content

• Very low carbon content

• high carbon content

Briefly explain how the iron is further refined in order produce steel?

• The carbon content is reduced

• The carbon content is increased

• further quantities of other metals

  are added

• It is mixed with other metals

Metals are available in a wide range of standardised stock forms.

What are the four dimensions you must consider when ordering box

section steel and what key requirements of the design must you consider?

• depth x width x wall thickness

• Length x Width x Height

• Wall thickness x Thickness x depth

Metals are available in a wide range of standardised stock forms. Suggest Two key requirements of the design that you must consider?

Metals are available in a wide range of standardised stock forms. Select two advantages of using standardised sized materials

• A wide variety of materials, components, tools, fittings and fixtures use the same standardised measurements and so are not compatible with one and other.

• Designers, architects and engineers can design and plan knowing what sizes are available to them.

• Manufacturers can ensure they use compatible machinery and components.

  Makes ordering easier.

• Manufacturers can make them all the time

What term is given to describe the coarseness of the thread on a screw, bolt or threaded rod?[

• Pitch

• Gauge

• Thread

Scientific instruments like the microscope below require fine adjustment.

The table or ‘stage’ on a microscope can be moved up and down using a fine adjustment knob. This uses a mechanism inside the body of the microscope called a ‘screw jack’ which raises or lowers a threaded rod connected to the stage.

Specify the material and type of thread required for the 'screw jack' in the microscope. Justify your answer?