MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Pulp Paper knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The ____________ is extraction of de-graded lignin compounds, which would increment the chemical usage in subsequent bleaching stages. |
| A. | B stage |
| B. | C stage |
| C. | D stage |
| D. | E stage |
| Answer» E. | |
| 2. |
Bleaching with H2O2, is not common for chemical pulps. (But this is changing somewhat as mills look for chlorine-free systems.) It’s used for brightening mechanical pulps. What is the name of the alternative method utilized? |
| A. | E stage |
| B. | H stage |
| C. | P stage |
| D. | D stage |
| Answer» D. D stage | |
| 3. |
____________ is a term used to describe each of 2 completely different methods. 1st is the utiliztion of enzymes which are isolated from decay fungi to selectively de-grade lignin. |
| A. | Bio electric |
| B. | Bio bleaching |
| C. | Electrocuting |
| D. | Bio degredation |
| Answer» C. Electrocuting | |
| 4. |
____________ and other chemicals are considered for bleaching stages, but don’t enjoy commercial importance. |
| A. | Nitrogen oxides |
| B. | Nitrogen peroxide |
| C. | Nitrous hydroxide |
| D. | Hydrogen |
| Answer» B. Nitrogen peroxide | |
| 5. |
Lignin-Cl + NaOH and rarr;Lignin-OH + NaClThe lignin in the E effluent gives a ____________ colour that’s ultimately responsible for much of the colour of the final mill effluent. |
| A. | Light |
| B. | Dark |
| C. | Transparent |
| D. | Full black |
| Answer» C. Transparent | |
| 6. |
The ____________ stage is a modification of C stage bleaching, where some of the chlorine is replaced with ClO2. |
| A. | AD |
| B. | CD |
| C. | FD |
| D. | MD |
| Answer» C. FD | |
| 7. |
2NaCl + 2 H2O + ____________ andrarr; Cl2 + 2NaOH + H2 |
| A. | Electricity |
| B. | Heat |
| C. | Acid |
| D. | Alkali |
| Answer» B. Heat | |
| 8. |
Mechanical pulp bleaching is accomplished with various compounds containing Cl or O2 and alkali extractions in several stages. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
Cellulose viscosity of mechanical pulps and of high yield pulps are not measured since it’s quite low . |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
THE______________IS_EXTRACTION_OF_DE-GRADED_LIGNIN_COMPOUNDS,_WHICH_WOULD_INCREMENT_THE_CHEMICAL_USAGE_IN_SUBSEQUENT_BLEACHING_STAGES.?$ |
| A. | B stage |
| B. | C stage |
| C. | D stage |
| D. | E stage |
| Answer» E. | |
| 11. |
BLEACHING_WITH_H2O2,_IS_NOT_COMMON_FOR_CHEMICAL_PULPS._(BUT_THIS_IS_CHANGING_SOMEWHAT_AS_MILLS_LOOK_FOR_CHLORINE-FREE_SYSTEMS.)_IT‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬•S_USED_FOR_BRIGHTENING_MECHANICAL_PULPS._WHAT_IS_THE_NAME_OF_THE_ALTERNATIVE_METHOD_UTILIZED??$# |
| A. | E stage |
| B. | H stage |
| C. | P stage |
| D. | D stage |
| Answer» D. D stage | |
| 12. |
____________ is a term used to describe each of 2 completely different methods. 1st is the utiliztion of enzymes which are isolated from decay fungi to selectively de-grade lignin? |
| A. | Bio electric |
| B. | Bio bleaching |
| C. | Electrocuting |
| D. | Bio degredation |
| Answer» C. Electrocuting | |
| 13. |
____________ and other chemicals are considered for bleaching stages, but don’t enjoy commercial importance.$ |
| A. | Nitrogen oxides |
| B. | Nitrogen peroxide |
| C. | Nitrous hydroxide |
| D. | Hydrogen |
| Answer» B. Nitrogen peroxide | |
| 14. |
Lignin-Cl + NaOH and rarr;Lignin-OH + NaCl |
| A. | |
| B. | Light |
| C. | Dark |
| Answer» C. Dark | |
| 15. |
The ____________ is the process of extraction of degraded lignin compounds, which could increment the chemical usage in subsequent bleaching stages. |
| A. | A stage |
| B. | B stage |
| C. | C stage |
| D. | E stage |
| Answer» E. | |
| 16. |
The ____________ stage is a modification of C stage bleaching, where some of the chlorine is replaced with ClO2. |
| A. | AD |
| B. | CD |
| C. | FD |
| D. | MD |
| Answer» C. FD | |
| 17. |
2NaCl + 2 H2O + ____________ andrarr; Cl2 + 2NaOH + H2 |
| A. | Electricity |
| B. | Heat |
| C. | Acid |
| D. | Alkali |
| Answer» B. Heat | |
| 18. |
Mechanical pulp bleaching is accomplished with various compounds containing Cl or O2 and alkali extractions in several stages. |
| A. | True |
| B. | False |
| Answer» C. | |
| 19. |
Cellulose viscosity of mechanical pulps and of high yield pulps are not measured since it’s quite low . |
| A. | True |
| B. | False |
| Answer» C. | |