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
Explanation: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
Explanation: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
Explanation: 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
Explanation: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
Explanation: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
Explanation: 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
Explanation: 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. 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
Explanation: 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.
9. ___________ are made primarily of bleached chemical softwood pulps and which could have bleached softwood sawdust or hardwood pulps to impart smoothness.
a) Tissues
b) Fiber
c) Paper
d) Uncoated groundwood
Explanation: Tissue papers are made primarily of bleached chemical softwood pulps and which could have bleached softwood sawdust or hardwood pulps to impart smoothness.
10. Newsprint accounts for about 80% of this grade. What is the type we are talking about?
a) Coated groundwood
b) Tissue
c) Uncoated groundwood
d) Uncoated wood-free paper
Explanation: This grade is made from mechanical pulps, although small amounts of chemical pulps are utilised to increment in the strength. T.M.P pulps, being stronger than groundwood, have dec. the chemical pulp requirements of these grades.