Why is zone refining carried out in an inert atmosphere?

To reduce the external pressure

To reduce the external temperature

Which of the following is an electrolyte used during the electrolytic refining of copper?

Copper sulphate solution acidified with sulphuric acid

20 + Mcqs in Refining in Pulp Paper Page 1 McqOptions

1.	Why is zone refining carried out in an inert atmosphere?
A.	To prevent reduction of metal
B.	To prevent oxidation of metal
C.	To reduce the external pressure
D.	To reduce the external temperature
Answer» C. To reduce the external pressure

Discussion

2.	Which of the following is not refined by zone refining method?
A.	Germanium
B.	Silicon
C.	Gallium
D.	Gold
Answer» E.

Discussion

3.	Which of the following is an electrolyte used during the electrolytic refining of copper?
A.	Copper sulphate solution
B.	Copper sulphate solution acidified with sulphuric acid
C.	Sulphuric acid
D.	Copper chloride
Answer» C. Sulphuric acid

Discussion

4.	What is the purity range for copper obtained from electrolytic refining?
A.	90-95%
B.	98-99%
C.	100%
D.	99.95-99.99%
Answer» E.

Discussion

5.	What is the anode made up of in electrolytic refining?
A.	Impure metal
B.	The metal ore
C.	Pure metal
D.	Double salt of metal
Answer» B. The metal ore

Discussion

6.	Which of the following processes is used to purify lead?
A.	Distillation
B.	Liquation
C.	Electrolytic refining
D.	Zone refining
Answer» C. Electrolytic refining

Discussion

7.	Zone refining is also called fractional crystallization.
A.	True
B.	False
Answer» B. False

Discussion

8.	Which of the following metals cannot be refined by distillation?
A.	Zinc
B.	Cadmium
C.	Mercury
D.	Tin
Answer» E.

Discussion

9.	Which of the following is not an impurity generally present in crude metals?
A.	Other metals
B.	Non-metals
C.	Unreacted oxides
D.	Pine oil
Answer» E.

Discussion

10.	Refining is not an important process in metallurgy.
A.	True
B.	False
Answer» C.

Discussion

11.	In __________ both the burst and tear strengths are crucial, although increment in refining to raise the burst strength leads to less tear strength.
A.	Brown paper bag
B.	Polythene
C.	Black paper bag
D.	Carton bag
Answer» B. Polythene

Discussion

12.	__________ is a measure of the power input to the motors of the refiner based on the amount of pulp processed. It’s an indirect measure of the energy spent in cutting.
A.	Refining power
B.	Actualization power
C.	Compartmentalization power
D.	Degree power
Answer» B. Actualization power

Discussion

13.	Fill in the blank. __________= (∑ Ni X Li)/ (∑ Ni)
A.	Pulp average processed
B.	Mass average processed
C.	Weight average processed
D.	Number average length
Answer» E.

Discussion

14.	What is the name of the part?
A.	Cutting coarse bar
B.	Double disk refiner
C.	Twin flow refiners
D.	Food processing
Answer» D. Food processing

Discussion

15.	Mass average lengt?
A.	Weight average length
B.	Power average momentum
C.	Work done average power
Answer» B. Power average momentum

Discussion

16.	Refiners are machines that mechanically macerate and/or cut pulp fibers prior to making them into paper.
A.	True
B.	False
Answer» B. False

Discussion

17.	What are the 2 types of refiners in refining?
A.	Cubical and cuboidal
B.	Circular and triangular
C.	Disk and conical
D.	Conical and circular
Answer» D. Conical and circular

Discussion

18.	A __________ is an early device used to treat pulp to improve the papermaking properties.
A.	Refiner
B.	Beater
C.	Hinge
D.	Spreader cone
Answer» C. Hinge

Discussion

19.	__________ is the production of rough surfaces on fibers by mechanical action; refiners break the outer layer of fibers and the secondary cell wall to protrude from the fiber surfaces.
A.	Fibrillation
B.	Drainage
C.	Fiber cutting
D.	Fiber brushing
Answer» B. Drainage

Discussion

20.	Pulp refining is a chemical treatment process of pulp fibers to evolve their papermaking properties in which paper properties depend on the product being made.
A.	True
B.	False
Answer» C.

Discussion

Explore topic-wise MCQs in Pulp Paper.

Why is zone refining carried out in an inert atmosphere?

Which of the following is not refined by zone refining method?

Which of the following is an electrolyte used during the electrolytic refining of copper?

What is the purity range for copper obtained from electrolytic refining?

What is the anode made up of in electrolytic refining?

Which of the following processes is used to purify lead?

Zone refining is also called fractional crystallization.

Which of the following metals cannot be refined by distillation?

Which of the following is not an impurity generally present in crude metals?

Refining is not an important process in metallurgy.

In __________ both the burst and tear strengths are crucial, although increment in refining to raise the burst strength leads to less tear strength.

__________ is a measure of the power input to the motors of the refiner based on the amount of pulp processed. It’s an indirect measure of the energy spent in cutting.

Fill in the blank. __________= (∑ Ni X Li)/ (∑ Ni)

What is the name of the part?

Mass average lengt?

Refiners are machines that mechanically macerate and/or cut pulp fibers prior to making them into paper.

What are the 2 types of refiners in refining?

A __________ is an early device used to treat pulp to improve the papermaking properties.

__________ is the production of rough surfaces on fibers by mechanical action; refiners break the outer layer of fibers and the secondary cell wall to protrude from the fiber surfaces.

Pulp refining is a chemical treatment process of pulp fibers to evolve their papermaking properties in which paper properties depend on the product being made.