A. A horizontal line on the humidity chart indicates the temperature changes at constant molal
humidity
B. When water is cooled from 80 to 70°C by exposure to the air with a wet bulb temperature of
60°C, then both the approach & the range would be 10°C
C. For unsaturated air-water vapor mixture at atmospheric conditions, the wet bulb temperature
& adiabatic cooling lines are the same
D. Relative saturation of unsaturated mixture of water vapor & air cannot be increased by either
reducing the mixture temperature or by increasing the total pressure
Related Mcqs:
- Pick out the wrong statement. Generally for physical adsorption, a gas of________________?
A. Higher molecular weight is adsorbed in preference to a gas of low molecular weight
B. High critical temperature is adsorbed in preference to a gas of low critical temperature
C. Low volatility is adsorbed in preference to a gas of high volatility
D. None of these - Pick out the wrong statement ?
A. Absorption factor is constant, when the equilibrium and operating lines are straight
B. In case of a stripper, the equilibrium curve is always below the operating line
C. In case of an absorber, the operating line is always above the equilibrium curve
D. In the absorption of low solubility gases, the liquid film is the controlling resistance - Pick out the wrong statement. Raoult’s law does not apply, when the______________________?
A. Size of component molecules are not equal
B. Attractive forces between like and unlike molecules in the solution are approximately equal
C. Component molecules are non-polar
D. Chemical combination or molecular association between unlike molecules takes place in the
formation of solution - Pick out the wrong statement?
A. The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are the same
for NSc = NPr= 1
B. 1 Nm3 of dry air is lighter than 1Nm3 of humid air
C. The Lewis number of a mixture is unity, when the thermal diffusivity is equal to the mass
diffusivity
D. An Azeotropic mixture of two liquids has boiling point higher than either of them, when it
shows negative deviation from Raoult’s Law - Pick out the wrong statement ?
A. With decrease in feed temperature, the number of plates required for binary distillation
decreases for a given ‘L/V’ ratio
B. The extraction per unit of total height for a short packed column is more effective than for a
tall column, in case of liquid-liquid extraction
C. Natural draft cooling towers are made of ferroconcrete and its cross-section is wider at the
bottom
D. Vander wall adsorption is also called chemisorption - Pick out the wrong statement pertaining to leaching ?
A. Fine solids cannot be leached in a Pachuca tank
B. Door classifier can be used for leaching of coarse solids
C. Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor
D. Very high temperature is not needed for the leaching of sugar beet - Pick out the wrong statement ?
A. Different solids have different equilibrium moisture curves
B. Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele
method of theoretical plate calculation for distillation column
C. Heat removal load on cooler remains constant, even with increase of the reflux ratio in a
distillation column
D. Even a forced draft cooling tower cannot cool water below the wet bulb temperature - Pick out the wrong statement?
A. When the concentration difference for the mass transfer becomes zero at the bottom of the gas
absorption tower, then the upper end of the operating line touches the equilibrium curve
B. The average distance between the operating line and equilibrium line is large, when the liquidgas
ratio is also large in case of a counter current gas absorption tower
C. The operating line lies above the equilibrium curve in case of a gas desorber
D. With decrease in the liquid flow rate for a fixed gas flow rate, the slope of the operating line
decreases, in case of gas absorption process - Pick out the wrong statement ?
A. Reboiler is not used in open steam distillation
B. The separation of solutes of different molecular sizes in a liquid solution by use of a suitable
membrane is called dialysis
C. Freeze drying is used for the drying of fish
D. Fenske-Underwood equation is used for calculating theoretical number of plates in a
distillation column at normal operating reflux condition - Pick out the wrong statement?
A. Critical moisture content is not a property of the material itself
B. A sharp increase in pressure drop gives an indication of the flooding in a distillation column
C. Separation of components is not possible in liquid extraction, if selectivity is unity
D. Dehydration of ethyl alcohol is most economically done by molecular distillation at very high
vacuum
