Pulp & Paper Questions and Answers – Related Pulping Methods

This set of Pulp and Paper Interview Questions and Answers focuses on “Related Pulping Methods”.

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

Answer: a
Explanation: 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
View Answer

Answer: a
Explanation: 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
View Answer

Answer: b
Explanation: 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.
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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
View Answer

Answer: d
Explanation: 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
View Answer

Answer: c
Explanation: The lignin is sufficiently soft that separation occurs at the middle lamella, and fibers are left with a hard lignin surface.
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6. What is the other name of Masonite process?
a) Ignition process
b) Steam explosion
c) Mason process
d) TMP
View Answer

Answer: b
Explanation: 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
View Answer

Answer: d
Explanation: The other name of this process is called ‘steam explosion’. Chips are steamed at 180-250 degree celcius.
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8. What is the range of yield in the Masonite process?
a) 50-60%
b) 40-30%
c) 80-90%
d) 10-20%
View Answer

Answer: c
Explanation: 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
View Answer

Answer: b
Explanation: 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.
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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
View Answer

Answer: a
Explanation: A mild explosion pulping process is being used at one mill to process recycled paper.

Sanfoundry Global Education & Learning Series – Pulp and Paper.
To practice all areas of Pulp and Paper for Interviews, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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