Power Plant Engineering (2171910) MCQs

MCQs of Feed Water Treatment

Showing 1 to 10 out of 29 Questions
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1.

The process of deterioration of a metal due to unwanted chemical or electrochemical interaction of the metal with its environment is called ___________.

(a)

electrolysis
(b)

electrodialysis
(c)

corrosion
(d)

deposition
Answer:

Option (c)

2.

In boilers, the feed water treatment is done mainly for removing_________.

(a)

corrosion
(b)

scale formation
(c)

caustic embrittlement
(d)

all of these
Answer:

Option (d)

3.

Which of the following is an example of corrosion?

(a)

Rusting of iron
(b)

Tarnishing of silver
(c)

Liquefaction of ammonia
(d)

Rusting of iron and tarnishing of silver
Answer:

Option (d)

4.

The scale formation in boiler

(a)

reduces heat transfer
(b)

raises the temperature of metal wall
(c)

reduces flow area
(d)

all of these
Answer:

Option (d)

5.

Which of the following is not a result of the excess of impurity in boiler-feed?

(a)

Scale and sludge formation
(b)

Decomposition
(c)

Corrosion, priming and foaming
(d)

Caustic embrittlement
Answer:

Option (b)

6.

____________is caused by using highly alkaline water.

(a)

corrosion
(b)

embrittlement
(c)

carryover
(d)

scale and sludge formation
Answer:

Option (b)

7.

The phenomenon during which the boiler material becomes brittle due to the accumulation of caustic substances is known as ___________.

(a)

foaming
(b)

priming
(c)

corrosion
(d)

caustic embrittlement
Answer:

Option (d)

8.

Foaming is caused by the formation of ___________.

(a)

acids
(b)

alcohols
(c)

oils and alkalis
(d)

ketones
Answer:

Option (c)

9.

The pH value of feed water should be maintained greater than ___________to reduced corrosion.

(a)

9.6
(b)

10.6
(c)

7
(d)

6.7
Answer:

Option (a)

10.

To avoid scale formation _________is added to boiler drum when alkalinity of boiler water is low.

(a)

disodium phosphate
(b)

mono-sodium phosphate
(c)

trisodium phosphate
(d)

sodium carbonate
Answer:

Option (c)

Showing 1 to 10 out of 29 Questions
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