JNTU Kakinada B-Tech 2-2 RT22013 STRENGTH OF MATERIALS – II R13 April 2018 Question Paper

Code No: RT22013
II B. Tech II Semester Supplementary Examinations, April-2018
STRENGTH OF MATERIALS – II (Civil Engineering)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answer ALL the question in Part-A
3. Answer any THREE Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1. a)What is Mohr?s circle of stresses? (4M)
b)Draw springs in series and springs in parallel (4M)
c)What are the different types of columns? (3M)
d)Define bending stress &Direct stress (4M)
e)What are the stresses in beam subjects to unsymmetrical bending? (4M)
f)Define degree of freedom (3M)
PART -B
2. Derive expressions for principal stresses, principal planes and max shear stress if
there are like direct stresses accompanied by a state of simple shear (16M)
3. A shaft transmits 300kW power at 120rpm. Determine the necessary diameter of
solid circular shaft and the necessary diameter of hollow circular section, the
inside diameter being 2/3 of the external diameter. The allowable shear stress is
70N/mm
2
. Taking the density at material as 77N/m
3
, calculate the %saving in the
shaft if hollow shaft is used. (16M)
4. A column having a T section with a flange 120 mm x 16 mm and web 150 mm x
16mm is 3m long. Assuming the column to be hinged at both ends, find the
crippling load by using Euler?s formula. E = 2 x 10
6
Kg/cm
2 (16M)
5. A beam of rectangular cross section is subjected to pure bending with a moment of
20kNm. The trace of the plane of loading is inclined at 45
0
to the YY axis of the
section. Identify the N.A of the section and calculate the bending stress induced at
each corner of the beam section (16M)
1 of 2

SET – 4
R13
SET – 1
R13

Code No: RT22013
II B. Tech II Semester Supplementary Examinations, April-2018
STRENGTH OF MATERIALS – II (Civil Engineering)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answer ALL the question in Part-A
3. Answer any THREE Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1. a)What is Mohr?s circle of stresses? (4M)
b)Draw springs in series and springs in parallel (4M)
c)What are the different types of columns? (3M)
d)Define bending stress &Direct stress (4M)
e)What are the stresses in beam subjects to unsymmetrical bending? (4M)
f)Define degree of freedom (3M)
PART -B
2. Derive expressions for principal stresses, principal planes and max shear stress if
there are like direct stresses accompanied by a state of simple shear (16M)
3. A shaft transmits 300kW power at 120rpm. Determine the necessary diameter of
solid circular shaft and the necessary diameter of hollow circular section, the
inside diameter being 2/3 of the external diameter. The allowable shear stress is
70N/mm
2
. Taking the density at material as 77N/m
3
, calculate the %saving in the
shaft if hollow shaft is used. (16M)
4. A column having a T section with a flange 120 mm x 16 mm and web 150 mm x
16mm is 3m long. Assuming the column to be hinged at both ends, find the
crippling load by using Euler?s formula. E = 2 x 10
6
Kg/cm
2 (16M)
5. A beam of rectangular cross section is subjected to pure bending with a moment of
20kNm. The trace of the plane of loading is inclined at 45
0
to the YY axis of the
section. Identify the N.A of the section and calculate the bending stress induced at
each corner of the beam section (16M)
1 of 2

SET – 4
R13
SET – 1
R13

Code No: RT22013

6. a) Explain in brief how stresses in
b) Explain in brief the method of locating shear centre
7. Determine the forces in all the members of the frame by method of joints.

brief how stresses in beams due to unsymmetric bending is considered.
brief the method of locating shear centre
Determine the forces in all the members of the frame by method of joints.

2 of 2
R13 R13
beams due to unsymmetric bending is considered. (8+8M)
Determine the forces in all the members of the frame by method of joints. (16M)
SET – 4 SET – 1