Question 61 : To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)
1. increase both 'G' and 's'.
2. increase 'G' and decrease 's'
3. increase 's' and decrease 'G'
4. decrease both 'G' and 's'.
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Question 62 : Air initially at 10 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a
1. higher relative humidity
2. higher dew point.
3. higher absolute (specific) humidity.
4. higher wet bulb temperature.
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Question 63 : Overall efficiency of the distillation column is
1. the ratio of number of ideal plates to actual plates.
2. same as the Murphree efficiency.
3. the ratio of number of actual plates to ideal plates.
4. always more than the point efficiency.
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Question 64 : The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is
1. none of these
2. zero
3. +ve
4. -ve
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Question 65 : Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.
1. thermal conductivity
2. strength
3. electrical resistance
4. none of these.
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Question 66 : Drying operation under vacuum is carried out to
1. increase drying temperature.
2. reduce drying temperature.
3. dry those materials which have very high unbound mositure content.
4. dry materials having high bound moisture content.
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Question 67 : Relative humidity is the ratio of the
1. none of these
2. partial pressure of the vapour to the vapour pressure of the liquid at room temperature.
3. actual humidity to saturation humidity.
4. partial pressure of the vapour to the vapour pressure of the liquid at gas temperature.
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Question 68 : __________ columns are used for liquid dispersion in a continuous gas phase.
1. Packed
2. Bubble cap
3. Pulse
4. Sieve plate
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Question 69 : When the temperature and humidity of air is low, we usually use __________ draft cooling tower.
1. induced
2. none of these
3. natural
4. forced
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Question 70 : In batch distillation with constant reflux, overhead product composition __________ with time.
1. decreases
2. increases
3. may increase on decrease, depends on the system.
4. does not vary
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