Process Calculations GATE-2002

Q 1: Methane is mixed with a stoichiometric proportion of oxygen and completely combusted. The number of additional specifications required to determine the product flow rate and composition is

A) 0
B) 1
C) 2
D) 3

Show Answer

Q 2: Fresh orange juice contains 12 % (by weight) solids and the rest water. 90 % of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10 % of fresh juice. The resultant product contains 40 % solids. The kg of water removed from 1 kg of fresh juice is

A) 0.4
B) 0.5
C) 0.6
D) 0.7

Show Answer

Q 3: 1 kg of a saturated aqueous solution of a highly soluble component A at 60⁰ C is cooled to 25⁰ C. The solubility limits of A are (0.6 kg A)/(kg water) at 60⁰ C and (0.2 kg A)(kg water) at 25⁰ C. The amount in kgs of the crystals formed is

A) 0.4
B) 0.25
C) 0.2
D) 0.175

Show Answer

Q 4: In the hydrodealkylation of toluene to benzene, the following reactions occur

C_7H_8+H_2\rightarrow C_6H_6+CH_4 2C_6H_6\leftrightarrow C_{12}H_{10}+H_2

Toluene and hydrogen are fed to a reactor in a molar ratio of 1:5. 80 % of the toluene gets converted and the selectivity of benzene (defined as moles of benzene formed/moles of toluene converted) is 90 %. The fractional conversion of hydrogen is

A) 0.16
B) 0.144
C) 0.152
D) 0.136

Show Answer