E-PolyLearning

41. In case of an absorber, the operating
a. line always lies above the equilibrium curve.
b. line always lies below the equilibrium curve.
c. line can be either above or below the equilibrium curve.
d. velocity is more than the loading velocity.
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Answer: (a).line always lies above the equilibrium curve.

42. Total reflux in a distillation operation requires minimum
a. reboiler load
b. number of plates
c. condenser load
d. all (a), (b) and (c)
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Answer: (b).number of plates

43. The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by
a. raising the temperature.
b. lowering the total pressure.
c. both (a) and (b).
d. neither (a) nor (b).
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Answer: (c).both (a) and (b).

44. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is
a. +ve
b. -ve
c. zero
d. none of these
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Answer: (a).+ve

45. Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the
a. relative volatility is reasonably constant.
b. mixture (to be separated) shows negative deviation from ideality.
c. mixture (to be separated) shows positive deviation from ideality.
d. multicomponent distillation is involved.
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Answer: (a).relative volatility is reasonably constant.