Pass and Purge Systems MCQ

Test your knowledge with important Pass and Purge Systems MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Pass and Purge Systems MCQs at Bissoy

• What do you mean by the splitting point?
  ক

  The two streams split with different composition

  খ

  The two streams split with equal composition

  গ

  Assuming it’s not a reactor and there’s only 2 streams

  ঘ

  Assuming it’s not a reactor and there’s only 1 stream
• The fresh feed to an ammonia synthesis reactor contains nitrogen, hydrogen and 2.0 mole per cent inerts. The molar ratio of H2:N2 is 3:1. The product stream consists of pure ammonia. Since conversion in the reactor is only 15%, a recycle stream is used and in order to avoid build-up of inerts, a purge stream is withdrawn. The rate of purge stream is adjusted to keep inert concentration in the recycle stream at 8 mole per cent. For a fresh feed rate of 100 moles/hr. Note that recycle stream contains only nitrogen, hydrogen and inerts. The N2:H2 ratio of 1:3 is maintained in every process stream, and calculate the number of moles, moles of inerts and moles of hydrogen in the recycle stream?
  ক

  437 moles/hr, 35 moles/hr, 301.5 moles/hr

  খ

  237 moles/hr, 30 moles/hr, 200 moles/hr

  গ

  567 moles/hr, 35 moles/hr, 205 moles/hr

  ঘ

  347 moles/hr, 30 moles/hr, 500 moles/hr
• The fresh feed to an ammonia synthesis reactor contains nitrogen, hydrogen and 2.0 mole per cent inerts. The molar ratio of H2:N2 is 3:1. The product stream consists of pure ammonia. Since conversion in the reactor is only 15%, a recycle stream is used and in order to avoid build-up of inerts, a purge stream is withdrawn. The rate of purge stream is adjusted to keep inert concentration in the recycle stream at 8 mole per cent. For a fresh feed rate of 100 moles/hr. Note that recycle stream contains only nitrogen, hydrogen and inerts. The N2:H2 ratio of 1:3 is maintained in every process stream, and calculate the moles of nitrogen entering the reactor and in the recycle stream?
  ক

  125 moles/hr, 100.50 moles

  খ

  135 moles/hr, 50 moles

  গ

  125 moles/hr, 50 moles

  ঘ

  185 moles/hr, 100.50 moles
• The fresh feed to an ammonia synthesis reactor contains nitrogen, hydrogen and 2.0 mole per cent inerts. The molar ratio of H2:N2 is 3:1. The product stream consists of pure ammonia. Since conversion in the reactor is only 15%, a recycle stream is used and in order to avoid build-up of inerts, a purge stream is withdrawn. The rate of purge stream is adjusted to keep inert concentration in the recycle stream at 8 mole per cent. For a fresh feed rate of 100 moles/hr. Note that recycle stream contains only nitrogen, hydrogen and inerts. The N2:H2 ratio of 1:3 is maintained in every process stream. Calculate the moles of ammonia produced.
  ক

  38.90 moles/hr

  খ

  28.90 moles/hr

  গ

  37.50 moles/hr

  ঘ

  27.50 moles/hr
• Which of the following is not the application of recycle system?
  ক

  Increased reactant conversion

  খ

  Decreased reactant conversion

  গ

  Continuous catalyst regeneration

  ঘ

  Circulation of the working fluid
• A solution of potassium dichromate in water contains 15% w/w Kr2Cr2O7. Calculate the amount of Kr2Cr2O7 that can be produced from 1500 kg of solution if 700 kg of water is evaporated and remaining solution is cooled to 293K. Data: Solubility of Kr2Cr2O7 at 293 K is 115 kg per 1000 kg of water.
  ক

  158.875 kg

  খ

  156.678 kg

  গ

  145.478 kg

  ঘ

  148.875 kg
• A single effect evaporator is fed with 10000 kg / h of weak liquor containing 15 % caustic by weight and is concentrated to get thick liquor containing 40 % by weight caustic. Calculate: (i) kg / h of water evaporated and (ii) kg / h of thick liquor
  ক

  4560 kg/h, 3720 kg/h

  খ

  3460 kg/h, 7680 kg/h

  গ

  4350 kg/h, 6732 kg/h

  ঘ

  6250 kg/h, 3750 kg/h
• What is the combined feed ratio from the following?
  ক

  Quantity of mixed feed stream to the quantity of fresh feed stream

  খ

  Quantity of recycle stream to the quantity of fresh feed stream

  গ

  Quantity of fresh feed stream to the quantity of recycle stream

  ঘ

  Quantity of fresh feed stream to the quantity of mixed feed stream
• Consider the following labeled flowchart for a simple chemical process based on reaction A -> B and predict the overall and single-pass conversion of the process?
  ক

  100%, 70%

  খ

  100%, 50%

  গ

  100%, 75%

  ঘ

  100%, 55%
• Which of the following represents the figure corresponding to the stream?
  ক

  Recycle system

  খ

  By-pass system

  গ

  Purge system

  ঘ

  Recover stream