Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the_________________?

Related Mcqs:

1. A butane isomerisation process produces 70 k.mole/hr of pure iso-butane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be_________________?

   A. 3 kmole/hr
   B. 4 kmole/hr
   C. 5 kmole/hr
   D. 6 kmole/hr

2. A bypass stream in a chemical process is useful, because it___________________?

   A. Facilitates better control of the process
   B. Improves the conversion
   C. Increases the yield of products
   D. None of these

3. In a chemical process, the recycle stream is purged for______________________?

   A. Increasing the product yield
   B. Enriching the product
   C. Limiting the inerts
   D. Heat conservation

4. A chemical process is said to occur under unsteady state, if the_________________?

   A. Inventory changes do not take place
   B. Ratio of streams entering/leaving are independent of time
   C. Flow rates & composition both are time dependent
   D. None of these

5. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of ________________?

   A. Fireclay
   B. Silicon carbide
   C. Corundum
   D. Siliceous fireclay

6. Pick out the wrong statement about the recycle stream in a process ?

   A. Recycling in a process stream helps in utilising the valuable reactants to the maximum with
   minimum loss of reactants
   B. The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the
   quantity of the same reactant entering the process as fresh feed is called combined feed ratio
   C. Recycling in a process does not help in getting higher extent of reaction
   D. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to
   maintain the quantity of liquid within the column

7. A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the ____________________?

   A. Atomic weight of the metal is 4
   B. Equivalent weight of the metal is 4
   C. Atomic weight of the metal is 2
   D. Equivalent weight of the metal is 8

8. Silica bricks are never used for lining the_________________?

   A. Beehive coke ovens
   B. By-product coke ovens
   C. Dome of blast furnace stoves
   D. Roof of open hearth furnace

9. Fireclay bricks are not used in the_________________?

   A. Blast furnace
   B. Hot blast stove
   C. Cupola
   D. Wall of coke oven

10. The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the_____________________?

    A. Relative humidity
    B. Relative saturation
    C. Percentage saturation
    D. None of these