Mechanical Engineering - Strength of Materials - Discussion

3. 

Two shafts 'A' and 'B' are made of same material. The shaft 'A' is of diameter D and shaft 'B' is of diameter D/2. The strength of shaft 'B' is __________ as that of shaft 'A'

[A]. one-eighth
[B]. one-fourth
[C]. one-half
[D]. four times

Answer: Option A

Explanation:

No answer description available for this question.

Rocky said: (Jul 3, 2016)  
Section modulus proportional to strength.

Vijay said: (Nov 28, 2016)  
It is 1/4 times.

Gowthamraj Mohan said: (Jan 10, 2017)  
1/4 times is correct.

Vikram said: (Mar 16, 2017)  
The strength of shaft depends on torque transmitted.

So, A is correct.

Sweta said: (Apr 24, 2017)  
Can anyone explain this?

Kay said: (May 17, 2017)  
Z (sectional modules) is directly proportional to (d)^3.

Meet said: (Oct 9, 2017)  
The strength of the shaft means torque transmitting capacity of the shaft without any plastic deformation.

&tTau; = 16*T/π* d^3.

As per this equation, T proportional to d^3.

Shivam said: (Aug 22, 2018)  
Given answer is right and you are right @Meet.
It is asking for max. bending stress supported by beam.

Indian said: (Dec 8, 2019)  
After simplification strength=1/4 *d ofshaft i.e 1/2*1/4=18.

Ayesh said: (Apr 13, 2020)  
Shaft strength depends upon polar modulus. So the answer is 1/8.

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