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Metals in biology



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Q1. Which of the following metals has the lowest liquid solubility (cc/kg) of hydrogen at atmospheric pressure?

(a) Iron
(b) Copper
(c) Magnesium
(d) Aluminium

Q2. In the hydrogen removal process, carbon monoxide for ferrous alloys removes not only hydrogen but also nitrogen.

(a) True
(b) False
(c) -
(d) -

Q3. Nitrogen cannot be used for ferrous and nickel based alloys in hydrogen removal technique because_____

(a) it leads to form high dross in metal castings
(b) it gives rise to porosity in metal castings
(c) it affects the grain size
(d) it generates blow holes in metal castings

Q4. Improper venting arrangement causes mechanical trapping of gases in metal castings.

(a) True
(b) False
(c) -
(d) -

Q5. Which of the following methods is best for preventing the solutions of gases in metals?

(a) Bubbling of gas
(b) Vacuum melting
(c) Venting arrangement
(d) Elements inclusion

Q6. Maintaining of hydrogen level to a minimum in a melt is very important because there is no simple dehydrogenating technique.

(a) True
(b) False
(c) -
(d) -

Q7. Which of the following formulas show the Sievert?s law of percent of hydrogen (H) present in a melt?

(a) H = K(pH2
(b) H = K*pHa
(c) H = K/pHa
(d) H = K?pHa

Q8. Presence of hydrogen in endothermic metals causes lattice distortion.

(a) True
(b) False
(c) -
(d) -

Q9. Which of the following equations represent the solubility (S) of the hydrogen in the metals?

(a) S = C exp[-Es/(k?)]
(b) S = C exp[-Es*(k?)]
(c) S = C log[-Es/(k?)]
(d) S = C log[-Es*(k?)]

Q10. Which of the following metals comes in an exothermic group of metals when the solubility of hydrogen is concerned?

(a) Iron
(b) Titanium
(c) Magnesium
(d) Nickel


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Froth Floatation Process Is Used For Concentration Of

Modified 140 Year Ago

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