Process Calculations GATE-2003

Q 1: A lubricant 100 times more viscous than water would have a viscosity (in Pa-s).

A) 0.01
B) 0.1
C) 1
D) 10

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Q 2: 6 g of carbon is burnt with an amount of air containing 18 g of oxygen. The product contains 16.5 g CO2 and 2.8 g CO besides other constituents. What is the degree of conversion on the basis of the disappearance of the limiting reactant?

A) 100 %
B) 95 %
C) 75 %
D) 20 %

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Q 3: An aqueous solution of 2.45 % by weight H₂SO₄ has a specific gravity of 1.011. The composition expressed in normality is

A) 0.2500
B) 0.2528
C) 0.5000
D) 0.5055

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Q 4: Air at a temperature of 20 ⁰C and 750 mm Hg pressure has a relative humidity of 80 %. What is its percentage humidity? The vapor pressure of water at 20 ⁰C is 17.5 mm Hg.

A) 80.38
B) 80
C) 79.62
D) 78.51

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Q 5: Na₂SO₄.10H₂O crystals are formed by cooling 100 kg of 30 % by weight aqueous solution of Na₂SO₄. The final concentration of the solute in the solution is 10 %. The weight of crystals is

A) 20
B) 32.2
C) 45.35
D) 58.65

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Q 6: A sample of natural gas containing 80 % methane (CH₄) and the rest of nitrogen (N₂) is burnt with 20 % excess air. With 80 % of the combustibles producing CO₂ and the remainder going to CO, the Orsat analysis in volume percent is

A) CO₂ : 6.26, CO : 1.56, O₂ : 3.91, H₂O : 15.66, N₂ : 72.60
B) CO₂ : 7.42, CO : 1.86, O₂ : 4.64, N₂ : 86.02
C) CO₂ : 6.39, CO : 1.60, O₂ : 3.99, H₂O : 15.96, N₂ : 72.06
D) CO₂ : 7.60, CO : 1.90, O₂ : 4.75, N₂ : 85.74

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Q 7: The heat capacity of air can be approximately expressed as

C_p=26.693+7.365\times10^{-3}T

Where C_p is in J/(mol.K) and T is in K. The heat given off by 1 mole of air when cooled at 1 atmospheric pressure from 500⁰ C to -100⁰ C is

A) 10.73 kJ
B) 16.15 kJ
C) 18.11 kJ
D) 18.33 kJ

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