Pulp and Paper Multiple Choice Questions and Answers (MCQs) on “Pulp Characterization”.
1. Pulp characterization is very important to determine the effects pulping, bleaching, refining, etc. on the properties of the pulp and, therefore, on the final paper properties.
a) True
b) False
Answer: a
Clarification: Pulp characterization is very important to determine the effects pulping, bleaching, refining, etc. on the properties of the pulp and, therefore, on the final paper properties.
2. The moisture content of pulp is calculated by drying a weighed portion of pulp in an oven at ____________ to constant weight .
a) 105 ± 3°C
b) 85 ± 3°C
c) 35 ± 3°C
d) 15 ± 3°C
Answer: a
Clarification: The moisture content of pulp’s calculated by drying a weighed portion of pulp in an oven at to 105 ± 3°C (221 ± 5T) constant weight.
3. What is the handsheet former called?
a) Dutch sheet mold
b) British sheet mold
c) French sheet mold
d) Lebanese sheet mold
Answer: b
Clarification: Round handsheets 15.9 cm (6.25 inches) in diameter are made according to T.A.P.P.I Standard T 205 and tested by methods in T.A.P.P.I Standard T 220.
4. Which of the mechanical pulps have significant fiber curling?
a) TMP
b) RPM
c) PWG
d) CMTP
Answer: a
Clarification: T.M.P. These pulps are prepared according to T.A.P.P.I Standard T 262, circulating 2% consistency stock at 90-95 °Celcius, to fully develop their strength properties by removing the curl.
5. The ____________ is a measure of the average chain length (degree of polymerization, DP) of cellulose.
a) Pulp velocity
b) Pulp viscosity
c) Lignin velocity
d) Lignin viscosity
Answer: b
Clarification: It is determined after dissolving the pulp in a suitable solvent such as cupriethylenediamine solution.
6. Increase in viscosity result from chemical pulping and bleaching operations and to a certain extent are unavoidable.
a) True
b) False
Answer: b
Clarification: Decreases in viscosity result from chemical pulping and bleaching operations and to a certain extent are unavoidable.
7. ____________ Standard T 261 is a means of measuring the fines content of pulps with a single screen classifier, the so-called Britt jar test.
a) TAPI
b) TARF
c) THNJ
d) TAPPI
Answer: d
Clarification: TAPPI Standard T 261 is a means of measuring the fines content of pulps with a single screen classifier, the so-called Brittjar test.
8. What is the name of the device?
a) Kajaani optical fiber analyser
b) Tyler optical fiber analyser
c) Kurt optical fiber analyser
d) Virgo optical fiber analyser
Answer: a
Clarification: Kajaani optical fiber classifier with analysis of 19,060 fibers (60% hardwood, 40% softwood by weight). Averages are number, 0.55 nun; length, 1.16 mm; and, mass, 1.88 mm.
9. What is the name of the device?
a) Kent pulp fiber classifier
b) Clark pulp fiber classifier
c) Max pulp fiber classifier
d) Magneto pulp fiber classifier
Answer: b
Clarification: Fiber lengths can also be determined by fiber classification using a series of at least four screens of increasingly smaller openings (TAPPI Standard T 233); two common instruments are the Clark type or Bauer-McNett type.
10. Papers containing ____________ that reduce CUSO4 might be utilized, provided the total reducing power of the additives is known and no more than about 75% of the total reducing power of the sheet.
a) ZnS and CaSO4
b) ZnSO4 and CaCO3
c) CaCO3 and MnO2
d) ZnS and CO2
Answer: a
Clarification: Papers containing ZnS, CaSO4, melamine resins, and other materials that reduce CuSO4 might be utilized to provide the total reducing power of the additives is known and no more than about 75% of the total reducing power of the sheet.
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