Chemical Process Calculation Questions and Answers – Material balances for a Combustion System-II

This set of Chemical Process Calculation Aptitude Test focuses on “Material balances for a Combustion System-II”.

1. The quantity of oxygen required to completely oxidize all the organic and inorganic compounds present in a sample is called
a) Total Oxygen Demand (TOD)
b) Chemical Oxygen Demand (COD)
c) Biochemical Oxygen Demand (BOD)
d) Theoretical Oxygen Demand (TOD)
View Answer

Answer: a
Explanation: The quantity of oxygen required to completely oxidize all the organic and inorganic compounds present in a sample is called Total Oxygen Demand.

2. The quantity of oxygen required to completely oxidize all the organic compounds present in a sample is called
a) Total Oxygen Demand (TOD)
b) Chemical Oxygen Demand (COD)
c) Biochemical Oxygen Demand (BOD)
d) Theoretical Oxygen Demand (TOD)
View Answer

Answer: b
Explanation: The quantity of oxygen required to completely oxidize all the organic compounds present in a sample is called Chemical Oxygen Demand.

3. The COD value is ________than the BOD value.
a) Lower
b) Higher
c) Depends on a particular sample
d) None of the mentioned
View Answer

Answer: b
Explanation: COD includes slowly biodegradable and recalcitrant organic compounds not degraded by microorganisams as in BOD test.
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4. The quantity of oxygen required by microorganisms to oxidize the organic compounds in a sample as deter present in a sample is called
a) Total Oxygen Demand (TOD)
b) Chemical Oxygen Demand (COD)
c) Biochemical Oxygen Demand (BOD)
d) Theoretical Oxygen Demand (TOD)
View Answer

Answer. c
Explanation: The quantity of oxygen required by microorganisms to oxidize the organic compounds in a sample as deter present in a sample is called Biochemical Oxygen Demand.

5. For BOD test, incorrect statement is
a) The test is carried out for number of days at 20 degree celsius
b) Five days is the most common duration
c) both a and b
d) None of the mentioned
View Answer

Answer: d
Explanation:The test is carried out for number of days at 20 degree celsius for five days.

6. “In BOD test, the quantity of O2 used is determined by the difference in the dissolved O2 in the water in the beginning of the test and at the end of five days”
above given statement is
a) True
b) False
c) Not sufficient data
d) None of the mentioned
View Answer

Answer: a
Explanation:”In BOD test, the quantity of O2 used is determined by the difference in the dissolved O2 in the water in the beginning of the test and at the end of five days.

7-9. For the combustion reaction of C5H12, 9 kgs of C5H12 and 172.62 kgs of air is there in the feed. 44 kgs of CO2 and 25 kgs of CO is recovered in the process.
C5H12 + 8o2 → 5CO2 + 6H2O

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7. What is value of entering O2 in moles?
a) 0.25
b) 1.25
c) 2.25
d) 3.25
View Answer

Answer: b
Explanation: Entering O2 means the O2 available in the feed.

8. What is the value of required O2 in moles?
a) 1
b) 2
c) 3
d) 4
View Answer

Answer: a
Explanation: Oxygen required by the substrate is required O2.
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9. What is the percent excess air?
a) 25
b) 45
c) 65
d) 85
View Answer

Answer: a
Explanation: Percentage excess air is the excess oxygen percentage.

10. “Percentage excess air depends on complete combustion, not on how much material is actually burned.”
Above given statement is
a) True
b) False
c) Depends on a particular hydrocarbon
d) None of the mentioned
View Answer

Answer: a
Explanation: Percentage excess air depends on complete combustion, not on how much material is actually burned.

Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation for aptitude tests, 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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