7011. Molecular seives are porous
Alumina
Silica
Synthetic zeolites crystals/metal alumino-silicates
None of these
✅ The correct answer is option C.
Chemical Engineering
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7012. Which of the following is used for the concentration of rubber latex?
Agitated film evaporator
Long tube vertical evaporator
Short tube evaporator
Calendria
✅ The correct answer is option A.
7013. In a counter-current extractor, as the axial mixing increases, the extraction efficiency
Increases
Decreases
Remains unchanged
Depends on the pressure of the system
✅ The correct answer is option B.
7014. Fenske’s equation for determining the minimum number of theoretical stages in distillation column holds good, when the
Relative volatility is reasonably constant
Mixture (to be separated) shows negative deviation from ideality
Mixture (to be separated) shows positive deviation from ideality
Multicomponent distillation is involved
✅ The correct answer is option A.
7015. With increase in temperature, the rate of leaching increases, because the
Diffusivity of solute increases
Viscosity of solvent decreases
Thermal conductivity of solute increases
None of these
✅ The correct answer is option A.
7016. In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed
q > 1
q < 1
q = 1
q = 0
✅ The correct answer is option C.
7017. Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.
100
50
78
None of these
✅ The correct answer is option A.
7018. An example of elutioh is
Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Separation of sugar from sugar beet by hot water
Dissolution of tannin out of tree barks by water
Recovery of vegetable oils from seeds
✅ The correct answer is option A.
7019. The minimum number of theoretical plates is required for achieving a given separation in distillation column with
No reflux
Total reflux
Zero reflux ratio
Minimum reflux ratio
✅ The correct answer is option B.
7020. JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by
Nsh = 2
Nst = 2
Nsc = 2
None of these
✅ The correct answer is option A.