Chemical Engineering MCQs

6108 MCQs  (Page 199 of 611)

Attempt Chemical Engineering Quiz
The efficiency of a plate column will be maximum, when the flow is ideal __________________ the plate?
A. Across
B. Above
C. Both a. & b.
D. Neither a. nor b.
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_______________ columns are used for liquid dispersion in a continuous gas phase ?
A. Packed
B. Pulse
C. Bubble cap
D. Sieve plate
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An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is ?
A. 9.21
B. 4.605
C. 100
D. 0.001
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Air initially at 101. 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____________________?
A. Higher dew point
B. Higher absolute (specific) humidity
C. Higher relative humidity
D. Higher wet bulb temperature
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With increase in the concentration of the adsorbate, the integral heat of adsorption____________________?
A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depends on the type of adsorbate
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A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process ?
A. Flow rate of inlet air
B. Relative humidity of outlet air
C. Humidity of inlet air
D. Temperature of the solid
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When the ____________________ the relative humidity of air decreases, despite an increase in the absolute humidity?
A. Temperature rises
B. Pressure rises
C. Temperature falls
D. Pressure falls
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Which of the following equipments is not used in liquid-liquid extraction ?
A. Pachuka tank
B. Agitated vessels
C. Centrifugal extractors
D. Packed towers
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In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________________?
A. Range is 15°f
B. Approach is 10°f
C. Both a. & b.
D. Neither a. nor b.
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To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate) ____________________?
A. Increase both ‘g’ and ‘s’
B. Decrease both ‘g’ and ‘s’
C. Increase ‘s’ and decrease ‘g’
D. Increase ‘g’ and decrease ‘s’
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Word of the Day
27 Jul
Widen
make or become wider.
چوڑا ہونا، کشادہ کرنے کا عمل

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