Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by

Question: Damage to metal surface by mechanical action is called
[A].

pitting

[B].

corrosion

[C].

erosion

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: The pH value is the measure of hydrogen ion concentration in a solution. The term pH stands for the __________ in the solution.
[A].
power of hydrogen ion concentration
[B].

percentage of hydrogen ions
[C].

presence of hydrogen ions
[D].

none of these 

Answer: Option A

Explanation:

No answer description available for this question.

Question: Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m2 of steel strip.
[A].

5-10

[B].

1000-1500

[C].

120-500

[D].

1500-3000

Answer: Option C

Explanation:

No answer description available for this question.

Question: Metals in general have a low value of thermal
[A].

conductivity

[B].

diffusivity

[C].

inertia

[D].

all (a), (b) & (c)

Answer: Option C

Explanation:

No answer description available for this question.