250+ TOP MCQs on Related Pulping Methods and Answers

Pulp and Paper Interview Questions and Answers on “Related Pulping Methods”.

1. The Asplund process was developed about 30 years prior to TMP.
a) True
b) False
Answer: a
Clarification: The Asplund process was developed about 30 years prior to TMP.

2. Asplund process involves pre-steaming wood chips at temperature above the glass transition temperature of lignin.
a) True
b) False
Answer: a
Clarification: The Asplund process was developed about 30 years prior to TMP. It involves pre-steaming wood chips at temperature above the glass transition temperature of lignin. 550-950 kPa steam pressureat 150-170 degree Celcius.

3. What is the pressure range at which the wood chips are pre-streamed?
a) 1300-1950 kPa
b) 550-950 kPa
c) 42-78 kPa
d) 1285-1950 kPa
Answer: b
Clarification: The Asplund process was developed about 30 years prior to TMP. It involves pre-steaming wood chips at temperature above the glass transition temperature of lignin. 550-950 kPa steam pressureat 150-170 degree Celcius.

4. What is the steam pressure range at which the wood chips are pre-heated?
a) 50-200 degree celcius
b) 300-340 degree celcius
c) 1500-2000 degree celcius
d) 150-170 degree celcius
Answer: d
Clarification: The Asplund process was developed about 30 years prior to TMP. It involves pre-steaming wood chips at temperature above the glass transition temperature of lignin. 550-950 kPa steam pressure at 150-170 degree Celcius.

5. The lignin is sufficiently soft that the separation occurs at __ lamella, and fibers are left with just a hard lignin surface.
a) Upper
b) Lower
c) Middle
d) Outskirt
Answer: c
Clarification: The lignin is sufficiently soft that separation occurs at the middle lamella, and fibers are left with a hard lignin surface.

6. What is the other name of Masonite process?
a) Ignition process
b) Steam explosion
c) Mason process
d) TMP
Answer: b
Explosion: The other name of this process is called ‘steam explosion’. Chips are steamed at 180-250 degree celcius.

7. What is the temperature range at which chips are steamed in the Masonite process?
a) 1500-1690 degree Fahrenheit
b) 35-80 degree Fahrenheit
c) 155-480 degree Fahrenheit
d) 335-480 degree Fahrenheit
Answer: d
Clarification: The other name of this process is called ‘steam explosion’. Chips are steamed at 180-250 degree celcius.

8. What is the range of yield in the Masonite process?
a) 50-60%
b) 40-30%
c) 80-90%
d) 10-20%
Answer: c
Clarification: In fiberboard the fibers are held together by resins such as phenol-formaldehyde. The yield is 80-90%.

9. Chips are steamed well above the glass transition temperature of lignin, for one to two minutes until final pressure is on the order of __ MPascal.
a) 14-20
b) 4-7
c) 19-25
d) 3-4
Answer: b
Clarification: Chips are steamed well above the glass transition temperature of lignin, for one to two minutes until final pressure is on the order of 4-7 MPascal.

10. A mild explosion pulping process is being used at one mill to process __ paper.
a) Recycled
b) Un-used
c) Over-used
d) Bloated
Answer: a
Clarification: A mild explosion pulping process is being used at one mill to process recycled paper.


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