Chemical Engineering - Mechanical Operations

11.
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as
NpNRe
NpNRe
Np → constant
Np ∝ 1/NRe
Answer: Option
Explanation:
No answer description is available. Let's discuss.

12.
Which of the following is not accomplished by agitation of liquids in agitators?
Dispersing gas in liquid.
Blending of immiscible liquids.
Dispersing immiscible liquid in form of emulsion.
Suspending solid particles.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

13.
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation ?
Check plates
Jaw plates
Toggles
Crush shaft
Answer: Option
Explanation:
No answer description is available. Let's discuss.

14.
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is
0.90 μm/s
1 μm/s
22.1 μm/s
0.02 μm/s
Answer: Option
Explanation:
No answer description is available. Let's discuss.

15.
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).
Answer: Option
Explanation:
No answer description is available. Let's discuss.