Chemical Engineering - Chemical Engineering Basics

41.
Electrometallurgical methods of metal extraction is normally used for those metals
whose oxide/ore is not reduced by carbon.
which fall in the category of alkali & alkaline earth metals.
which stands higher in the electrochemical series of the metal.
all (a), (b) & (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.

42.
Lowering of recrystallisation temperature of metals can be achieved by its
grain refinement.
purification.
working at lower temperature.
all a, b & c.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

43.
An example of a buffer solution is
mercury
lime water
human blood
concentrated nitric acid
Answer: Option
Explanation:
No answer description is available. Let's discuss.

44.
A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.
370
340
320
300
Answer: Option
Explanation:
No answer description is available. Let's discuss.

45.
Name the safety device used to protect the boiler, when the water level falls below a minimum level.
Blow down valve
Blow off cock
Fusible plug
Safety valve
Answer: Option
Explanation:
No answer description is available. Let's discuss.