Chemical Engineering - Chemical Engineering Basics

16. 

Pick out the correct statement.

A. A base is always soluble in water.
B. Hydrogen is released whenever a metal reacts with an acid.
C. Sodium hydroxide is both a base and an alkali.
D. All indicators give red solution with an acid.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

17. 

Ageing of steel refers to the

A. degradation of steel by corrosion.
B. failure of steel structure by overstress-ing.
C. return of sharp yield point in temper rolled low carbon sheet after a period of time.
D. decarburisation of steel by overheating.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

18. 

When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

A. partial pressure of water vapour is less than the total pressure.
B. humidity is < 100% & dew point temperature of air has not reached.
C. dew point temperature of air has not reached & air is not saturated fully.
D. air is fully saturated.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

19. 

When metals are heated to high temperature, their __________ increases in general.

A. atomic vibration
B. creep strength
C. yield stress & ultimate tensile strength
D. toughness & stiffness

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

20. 

A friction lighter is normally used for lighting gas welding torch, because of the reason that

A. its initial cost is very low.
B. duration of spark created is very small.
C. safety of welder is ensured.
D. it is easier to operate & maintain.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.