Chemical Engineering - Chemical Process

36. 

In sulphate pulp manufacture, the pressure and temperature in the digestor is

A. 10 atm., 800 °C
B. 10 atm., 170-180°C
C. 1 atm., 170 - 180°C
D. l atm., 800°C

Answer: Option B

Explanation:

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37. 

Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of

A. calcium sulphate
B. sodium chloride
C. sodium sulphate
D. magnesium chloride.

Answer: Option B

Explanation:

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38. 

Pick out the endothermic reaction out of the following.

A. C+O2 = CO
B. CO + 3H2 = CH4 + H2O
C. CaCO3 = CaO + CO2
D. CO +O2 = CO2

Answer: Option C

Explanation:

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39. 

Pasteurisation of milk means

A. removal of fatty and albuminous substance from it.
B. killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics.
C. inhibiting the growth of micro-organisms without killing them.
D. none of these.

Answer: Option B

Explanation:

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40. 

Fusion of bauxite and __________ produces high alumina cement.

A. alum
B. limestone
C. coke
D. quartz

Answer: Option B

Explanation:

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