Chemical Engineering - Chemical Process

31.
Which of the following impurities in feed water for high pressure boiler is the most detrimental ?
Silica
Dissolved oxygen
Suspended salt
Dissolved salt
Answer: Option
Explanation:
No answer description is available. Let's discuss.

32.
Which glass is usually used in optical work?
Lead glass
High silica (borosilicate) glass
Photo-sensitive glass
Fibre glass
Answer: Option
Explanation:

Lead glass, also known as lead crystal or flint glass, is usually used in optical work.

It is a type of glass that contains a high percentage of lead oxide (PbO) which gives the glass a higher refractive index and lower dispersion than normal soda-lime glass, which makes it useful for optical lenses and other optical components.

Lead glass has a higher refractive index which means that it bends light more than other types of glass, and a lower dispersion which means that it doesn't spread out different colors of light as much. This makes it ideal for use in lenses and other optical components where clarity and precision are important.

Lead glass is also used for creating beautiful glassware, because of its brilliant optical clarity, high refractive index, and high dispersion. It is also a good thermal insulator and has a high electrical resistance.


33.
Fourdrinier machine is used in the manufacture of
sugar
paper
alcohol from molasses
phenol formaldehyde
Answer: Option
Explanation:
No answer description is available. Let's discuss.

34.
The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent.
cationic
anionic
amphoteric
semi polar
Answer: Option
Explanation:
No answer description is available. Let's discuss.

35.
Reaction of calcium carbide with water produces a gas, which is used
as an illuminant.
for metal cutting/welding.
both (a) & (b).
neither (a) nor (b).
Answer: Option
Explanation:
No answer description is available. Let's discuss.