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181.

The treatment of water with only chlorine is known as

A.	plain chlorination	B.	post cholorination
C.	pre-chlorination	D.	de-chlorination

182.

Pre-chlorination

A.	improves coagulation	B.	reduces odours
C.	reduces tastes	D.	all of these

183.

To prevent the formation of crystalline hydrates of 'Ice' of chlorine, the chlorine supply cylinders are kept at a temperature from

A.	10?C to 20?C	B.	20?C to 27?C
C.	27?C to 37?C	D.	38?C to 42?C

184.

Crystalline hydrates of 'Ice" of chlorine are formed at a temerature of

A.	below 10?C	B.	15?C
C.	20?C	D.	above 20?C

185.

The apparatus used for feeding chlorine into water is called

A.	chlorine tank	B.	aeration fountain
C.	chlorinator	D.	none of these

186.

In pre-chlorination, the raw water is treated with chlorine only.

Agree

Disagree

187.

Plain chlorination is adopted for treating the water having turbidities less than 20 to 30 ppm.

Correct

Incorrect

188.

Which of the following statement is correct?

A.	Pre-chlorination reduces the bacterial load on filters.	B.	The substance used for disinfection of water is known as coagulant.
C.	Chlorine cannot be applied in the form of chloramines.	D.	all of the above

189.

The residual chlorine

A.	is zero	B.	is maximum
C.	reappears

190.

When the chlorine is added beyond the break point, the process of treating the water is known as

A.	plain chlorination	B.	post-chlorination
C.	dechlorination	D.	super-chlorination