Chemical Engineering Mcqs

Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________?

• (A)  British standard screens
• (B)  German standard screens (DIN 1171) etc
• (C)  American standard screens (ASTM and Tyler standard screens)
• (D)  All

Answer

Submitted By :Ali Uppal

The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter?

• (A)  Vacuum
• (B)  Sand
• (C)  Plate & frame
• (D)  Rotary

Answer

Submitted By :Ali Uppal

Which of the following gives the crushing energy required to create new surface ?

• (A)  Taggarts rule
• (B)  Fick’s law
• (C)  Rittinger’s Law
• (D)  None of these

Answer

Submitted By :Ali Uppal

A propeller agitator_______________?

• (A)  Produces mainly axial flow
• (B)  Is used for mixing high viscosity pastes
• (C)  Runs at very slow speed (2 rpm)
• (D)  All

Answer

Submitted By :Ali Uppal

Shell and leaf filter as compared to plate and frame filter _____________________?

• (A)  Entails less labor cost
• (B)  Facilitates filtration under higher pressure
• (C)  Provides more effective washing
• (D)  All

Answer

Submitted By :Ali Uppal

Length/diameter ratio of a ball mill is __________________ ?

• (A)  1.5
• (B)  1
• (C)  < 1
• (D)  > 1

Answer

Submitted By :Ali Uppal

Mixing mechanism employed in a pan mixer is by ________________?

• (A)  Mulling
• (B)  Kneading
• (C)  Dispersion
• (D)  None of these

Answer

Submitted By :Ali Uppal

Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?

• (A)  0.01 L.S
• (B)  0.087 L.S
• (C)  L.S
• (D)  L.S/0.087

Answer

Submitted By :Ali Uppal

Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are________________?

• (A)  Carbonates
• (B)  Sulphates
• (C)  Silicates & phosphates
• (D)  Bi-carbonates

Answer

Submitted By :Ali Uppal

Grinding efficiency of a ball mill is of the order of _______________ percent?

• (A)  1-5
• (B)  40-50
• (C)  75-80
• (D)  90-95

Answer

Submitted By :Ali Uppal