Chemical Engineering - Mechanical Operations - Discussion
Discussion Forum : Mechanical Operations - Section 5 (Q.No. 43)
43.
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?
Discussion:
5 comments Page 1 of 1.
Rajdeep said:
3 years ago
The right Answer is D because;
In question, diameter is given not radius so the (R-r)=.5625.
(√9.81/.5625)÷2π
= .66498.
In question, diameter is given not radius so the (R-r)=.5625.
(√9.81/.5625)÷2π
= .66498.
Nirmala said:
1 decade ago
Critical speed = ((g/R-r)^.5)/(2*3.14).
= 0.469 rps.
= 0.469 rps.
Nandini said:
5 years ago
Answer is 0.468. So option A is the answer.
VIJAYKUMAR JATOTH said:
7 years ago
Option B is the answer.
Kirub said:
2 years ago
Thanks @Rajdeep.
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