Power Plant Engineering (2171910) MCQs

MCQs of Feed Water Treatment

Showing 11 to 20 out of 29 Questions
1 2 3
11.

Blowing down of boiler water is the process to

(a)

reduce the boiler pressure
(b)

reduce the boiler temperature
(c)

increase the boiler pressure
(d)

control the solid concentration in the boiler water by removing some of the concentrated saline water 
Answer:

Option (d)

12.

What is the molecular formula of lime?

(a)

CaCO3
(b)

Al(OH)3
(c)

Ca(OH)2
(d)

Mg(OH)2
Answer:

Option (c)

13.

What is the molecular formula of soda?

(a)

Na2CO3
(b)

Al2(SO4)3
(c)

Mg(OH)2
(d)

Ca(OH)2
Answer:

Option (a)

14.

Which of the following is used as a coagulant in lime-soda process?

(a)

Na2CO3
(b)

Al2(SO4)3
(c)

Mg(OH)2
(d)

Ca(OH)2
Answer:

Option (c)

15.

What is the function of coagulant?

(a)

It helps in the formation of fine precipitate
(b)

It helps in the formation of coarse precipitate
(c)

It helps in increasing the solubility
(d)

It helps in increasing the boiling point
Answer:

Option (b)

16.

In lime soda process, capital cost is ___________ whereas operational expenses are __________.

(a)

high, low
(b)

high, high
(c)

low, low
(d)

low, high
Answer:

Option (d)

17.

Which of the following is not true for hot lime soda process?

(a)

calcium hydroxide and sodium carbonate are used as treating elements
(b)

it is suitable for higher hardness water
(c)

the soften water must be filtered before use
(d)

it removes silica very effectively
Answer:

Option (b)

18.

The chemical formula of sodium zeolite is ___________.

(a)

FeSO4H2O
(b)

Al2(SO4)H2O
(c)

Na2(Al2Si2O2)
(d)

Na2Al2O
Answer:

Option (c)

19.

Which of the following is not naturally occurring zeolite?

(a)

Na+
(b)

Al+3
(c)

Si+4
(d)

Ca+2
Answer:

Option (d)

20.

Natural zeolites are ___________.

(a)

porous
(b)

amorphous
(c)

non-durable
(d)

possess gel structure
Answer:

Option (b)

Showing 11 to 20 out of 29 Questions
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