1. Three low alloy steels, which differ only in their carbon content (0.1, 0.3 and 0.7 wt% carbon) are characterised using the Jominy end quench test. Select the plot of hardness variation along the test specimen that best describes their behaviour.

   

   	a	Plot (a)
   	b	Plot (b)
   	c	Plot (c)
   	d	Plot (d)

2. Two specimens of a low alloy steel with 0.3wt% carbon are characterised using the Jominy end quench test. One was austenitised at 950ēC, and the other was austenitised at 1100ēC. Select the plot of hardness variation along the test specimen that best describes their behaviour.

   

   	a	Plot (a)
   	b	Plot (b)
   	c	Plot (c)
   	d	Plot (d)

3. Three medium carbon steels (0.3wt%) that differ only in their Chromium content (0.25, 0.5 and 1 wt%) are characterised using the Jominy end quench test. Select the plot of hardness variation along the test specimen that best describes their behaviour.

   

   	a	Plot (a)
   	b	Plot (b)
   	c	Plot (c)
   	d	Plot (d)

4. You have three steels. Select the most appropriate steel to achieve the necessary levels of mechanical properties, residual stress and distortion in a 1mm diameter wood-working drill.

   	a	1% C, 0.4% Si, 1% Mn, 5% Cr, 1% Mo
   	b	0.4% C, 0.4% Mn, 0.3% Si
   	c	0.5% C, 4% Cr, 6% Mo

5. Again, you have three steels. Select the most appropriate steel to achieve the necessary levels of mechanical properties, residual stress and distortion in an injection moulding die for a mobile phone plastic case.

   	a	1% C, 0.4% Si, 1% Mn, 5% Cr, 1% Mo
   	b	0.4% C, 0.4% Mn, 0.3% Si
   	c	0.5% C, 4% Cr, 6% Mo

6. Again, you have three steels. Select the most appropriate steel to achieve the necessary levels of mechanical properties, residual stress and distortion in a tool for high speed milling of steel components.

   	a	1% C, 0.4% Si, 1% Mn, 5% Cr, 1% Mo
   	b	0.4% C, 0.4% Mn, 0.3% Si
   	c	0.5% C, 4% Cr, 6% Mo

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