Chemical Engineering Mcqs

Wetted wall tower experiment determines the__________________?

• (A)  Molal diffusivity
• (B)  Volumetric co-efficient
• (C)  Mass transfer co-efficient
• (D)  None of these

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

_______________ columns are used for liquid dispersion in a continuous gas phase ?

• (A)  Packed
• (B)  Pulse
• (C)  Bubble cap
• (D)  Sieve plate

Answer

Submitted By :Ali Uppal

Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their____________________?

• (A)  Viscosity
• (B)  Density
• (C)  Solubility
• (D)  Relative volatility

Answer

Submitted By :Ali Uppal

Priming in a distillation column_________________?

• (A)  Results from very low gas velocity
• (B)  Is desirable from point efficiency consideration
• (C)  Is characterised by the presence of foam throughout the space between trays
• (D)  Reduces the overall pressure drop

Answer

Submitted By :Ali Uppal

The caking of crystals can be prevented by _____________________?

• (A)  Maintaining high critical humidity
• (B)  Maintaining low critical humidity
• (C)  Coating the product with inert material
• (D)  Both

Answer

Submitted By :Ali Uppal