chemical engineering MCQs – Page 104

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

2061. The vapour pressure exerted by the moisture contained in a wet solid depends upon the____________________?
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A. All A., B. and C.

B. Nature of the solid

C. Temperature

D. Nature of the moisture

2062. If moisture content of solid on dry basis is X, then the same on wet basis is____________________?
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A. X/(1 X)

B. (1 + X)/X

C. X/(X + 1)

D. (1 X)/X

2063. The-relative volatility for separation of a non-ideal binary mixture by distillation should be ___________________?
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A. 1

B. < 1

C. 0

D. > 1

2064. Separation of two or more components of a liquid solution cannot be achieved by___________________?
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A. Absorption

B. Fractional crystallisation

C. Evaporation

D. Liquid extraction

2065. Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air ?
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A. Dry bulb temperature

B. Dew point

C. None of these

D. Wet bulb temperature

2066. With increase in pressure, the relative volatility for a binary system__________________?
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A. Remains same

B. Increases

C. Decreases

D. Either A. or B., depends on the system

2067. Mass transfer co-efficient of liquid is____________________?
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A. None of these

B. Affected more by temperature than that for gases

C. Not affected by the temperature

D. Affected much less by temperature than that for gases

2068. Selectivity of the solvent used in solvent extraction should be)_________________?
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A. 1

B. < 1

C. > 1

D. 0

2069. The following plot gives the saturated humidity (He) versus temperature (T).Line joining (H1, T1) and (H2, T2) is the constant enthalpy line. Choose the correct one from among the alternatives A, B, C and D____________________?
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A. T1-Wet bulb temp; T2-Dry bulb temp; T3-Dew point temp

B. T1-Dew point temp; T2-Wet bulb temp; T3-Dry bulb temp

C. T1-Dry bulb temp; T2-Wet bulb temp; T3-Dew point temp

D. T1-Dew point temp; T2-Dry bulb temp; T3-Wet bulb temp

2070. Absorption factor method is used to calculate the number of ideal stages, when_______________________?
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A. Operating line lies above the equilibrium line

B. Operating line lies below the equilibrium line

C. Both operating and equilibrium lines are parallel

D. Pressure drop in the column is very high

2071. For _______________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same?
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A. Unsaturated surface

B. Constant rate

C. Both A. and B.

D. Neither A. nor B.

2072. An ideal tower packing should not _______________________?
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A. Have large surface area per unit volume

B. Have large free cross-section

C. Have low weight per unit volume

D. Hold up large amount of liquid in the packing

2073. The shanks system of leaching (i.e., counter-current multiple contact leaching) is used for____________________?
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A. Recovery of tannis from the tree barks and woods

B. Leaching sodium nitrate from Chilean nitrate bearing rock

C. Both A. and B.

D. Neither A. nor B.

2074. _____________ temperature is the steady state temperature attained by a small amount of liquid evaporating into a large quantity of unsaturated gas-vapor mixture ?
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A. Dry bulb

B. None of these

C. Dew point

D. Wet bulb

2075. When the ____________________ the relative humidity of air decreases, despite an increase in the absolute humidity?
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A. Pressure rises

B. Temperature rises

C. Temperature falls

D. Pressure falls

2076. Pick out the correct statement ?
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A. For identical gas flow rates, less pressure drop occurs through a plate tower than through a

B. Plate column can handle greater liquid loads without flooding than packed column, but the

C. ked tower

D. All A., B. and C.

E. uid hold up is more in the case of plate column

F. For the same duty, plate columns weigh less than packed columns

2077. Pick out the wrong statement?
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A. The binary diffusivity in liquids is of the order of 10-5 cm2/sec

B. cess

C. w of a gas through a given capillary

D. According to Poiseuilles law, the permeability decreases with increase in temperature for

E. Molecular diffusion in solid is much faster than that in liquids

F. Particles movement from higher concentration to lower concentration takes place in diffusion

2078. Detergent solution is dried to a powder in a ________________________?
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A. Tunnel dryer

B. Spray dryer

C. Spouted bed dryer

D. Pan open to atmosphere

2079. In a binary system, separation is very efficient, when the relative volatility is_______________?
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A. < 1

B. 0.5

C. 1

D. > 1

2080. With increase in pressure, the relative volatility for a binary system_________________?
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A. Decreases

B. Remains same

C. Increases

D. Either A. or B., depends on the system

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