Chemical Engineering Mcqs

Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?

• (A)  Density separation
• (B)  Differential wettability
• (C)  Size
• (D)  Volatile matter content

Answer

Submitted By :Ali Uppal

Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?

• (A)  (1/2π). √(g/r)
• (B)  (1/π). √(g/r)
• (C)  ½ √(g/r)
• (D)  2π. √(g/r)

Answer

Submitted By :Ali Uppal

General crushing equation is given by d(P/m) = -K (dD̅ S/D̅ n S). Bond’s crushing law is obtained by solving this equation for n = _____________ and feed of infinite size?

• (A)  1
• (B)  1.5
• (C)  2
• (D)  2.5

Answer

Submitted By :Ali Uppal

Removal of activated carbon from glycerine is done by _________________?

• (A)  Plate and frame filter
• (B)  Rotary vacuum filter
• (C)  Batch basket centrifuge
• (D)  None of these

Answer

Submitted By :Ali Uppal

The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________?

• (A)  Bag filter
• (B)  Electrostatic precipitator
• (C)  Cyclone separator
• (D)  Wet scrubber

Answer

Submitted By :Ali Uppal

Chance process is used for the________________?

• (A)  Cleaning of coal
• (B)  Concentration of iron ore
• (C)  Concentration of pyrites
• (D)  Water treatment

Answer

Submitted By :Ali Uppal

Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the _____________ filtration?

• (A)  Constant rate
• (B)  Varying pressure
• (C)  Varying rate
• (D)  Constant pressure

Answer

Submitted By :Ali Uppal

During agitation of liquids, the_________________?

• (A)  Froude number is independent for the curves between power number and Reynolds number in baffled system
• (B)  Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller
• (C)  Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number
• (D)  All

Answer

Submitted By :Ali Uppal

Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?

• (A)  Jet mills
• (B)  Fluid energy mill
• (C)  Micronizer
• (D)  All

Answer

Submitted By :Ali Uppal

Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator ?

• (A)  Cresylic acid
• (B)  Copper sulphate
• (C)  Calcium carbonate
• (D)  Sodium carbonate

Answer

Submitted By :Ali Uppal