Mechanical Engineering - Theory of machines - Discussion
Discussion Forum : Theory of machines - Section 5 (Q.No. 32)
32.
A slender shaft supported on two bearings at its ends carries a disc with an eccentricity e from the axis of rotation. The critical speed of the shaft is Nc. If the disc is replaced by a second one of same mass but mounted with an eccentricily 2 e, then the critical speed of the shaft in the second case is
Discussion:
12 comments Page 1 of 2.
Gate topper said:
10 years ago
It I think critical speed does not depend on eccentricity.
Because is equal to sqrt(K/m) or sqrt(g/deflection).
Because is equal to sqrt(K/m) or sqrt(g/deflection).
Anurag said:
9 years ago
But deflection directly proportional to eccentricity i.e. Y = e/(wn/w) - 1. And hence the answer is correct.
Neeraj said:
9 years ago
C should be right, the critical speed depends upon the following factors:
Type of support (simply supported or cantilever type).
* Length of the shaft.
* Diameter of the shaft.
* Stiffness of the shaft.
* Mass of shaft.
Type of support (simply supported or cantilever type).
* Length of the shaft.
* Diameter of the shaft.
* Stiffness of the shaft.
* Mass of shaft.
(1)
Vinit said:
8 years ago
Agree @Neeraj.
The correct answer is C.
The correct answer is C.
(1)
Priyanshu said:
8 years ago
Critical speed depends on eccentricity too.
Kunal said:
8 years ago
Deflection is not asked @Anurag.
Sonu Sharma said:
7 years ago
C is the correct answer.
(1)
Subhash said:
7 years ago
Nc proportional to 1/√ reflection y and y proportional to e. So, the answer is A.
Nilesh said:
7 years ago
I think C is correct.
(1)
Rahul kumar said:
6 years ago
A is correct. Agree with the given answer.
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