A. 7
B. 70
C. 0.7
D. 150
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Related Mcqs:
- At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?
A. 0.0
B. 0.2
C. 0.4
D. 1.0 - Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the _______________ number?
A. Schmidt
B. Sherwood
C. Peclet
D. Stanton - An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively. The humidity of air sample expressed as kg of water vapour/kg of dry air is__________________?
A. 0.048
B. 0.079
C. 0.122
D. 0.152 - Water-ethyl alcohol solution can be concentrated (in respect of alcohol concentration) by ________________ distillation?
A. Atmospheric
B. Vacuum
C. High pressure
D. None of these - Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C ?
A. Humidification only
B. Heating only
C. Both heating and humidification
D. Evaporative cooling - 1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is________________________?
A. 0.4
B. 0.25
C. 0.2
D. 0.175 - Make up water is required in a cooling tower to replace the water lost by___________________?
A. Evaporation
B. Drift
C. Blowdown and leakage
D. All A., B. and C. - Make up water is supplied during cooling tower operation to compensate for water losses due to______________________?
A. Evaporation
B. Blowdown
C. Entrainment
D. All A., B. & C. - The relative saturation of a partially saturated mixture of vapour and gas can be increased by ________________ of the mixture?
A. Reducing the total pressure
B. Increasing the total pressure
C. Reducing the temperature
D. Both B. and C. - Molarity is defined as the number of gm moles of solute per ________________ of solvent?
A. Litre
B. kg
C. gm
D. c.c
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