School of Engineering and Technology - IET, BHADDAL

Roll No ____________

Department Of Mechanical EngineeringSOM - II MST to make up for Internal Deficiency of Previous Semester

(July – Nov., 2013)

Subject Code: BTME-401 Subject Name: SOM-II B.TECH – ME – 4th Semester Time: 1Hr 30 min Max Marks: 30

NOTE: All questions are compulsory.

1. What are the various functions of spring?

2. Derive expression for spring in series, spring in parallel?

3. A close coiled helical spring is to have a stiffness of 900 N/m in compression, with a maximum load of 45 N and maximum shearing stress of 120N/mm2. The solid length of the spring is 45mm. Take C = 40000 MPa

Finda) The wire diameter b) The mean diameterc) The number of coils

4. A flat spiral spring of is made of a strip 6mm wide 0.25mm thick and 12m long & The torque applied at the winding spindle and 9 complete turns are given calculate Torque, maximum stress & energy stored?

5. Leaf spring of semi-elliptic type has 11 plates each 9 cm wide and 1.5 cm thick. The length of spring is 1.5m. The plates are made of steel having a proof stress 650 MN\m2. To what radius should the plates be bent initially & From what height load 600N fall on to center of the spring if maximum stress is to be one-half of the proof stress. Take E = 200 GPa

6. A laminated wooden beam 10cm wide and 15cm deep is made up of three 5*10cm wide planks glued together to resist the longitudinal shear . The beam is simply supported over a span 2m. If the allowable shearing in the glued joint is 0.45 MN/m2, Find the safe concentrated load that the beam may carry.

School of Engineering and Technology - IET, BHADDAL

Roll No ____________

Department Of Mechanical EngineeringSOM - II MST to make up for Internal Deficiency of Previous Semester

(July – Nov., 2013)

Subject Code: BTME-401 Subject Name: SOM-II B.TECH – ME – 4th Semester Time: 1Hr 30 min Max Marks: 30

NOTE: All questions are compulsory.

1. What are the various functions of spring?

2. Derive expression for spring in series, spring in parallel?

3. A close coiled helical spring is to have a stiffness of 900 N/m in compression, with a maximum load of 45 N and maximum shearing stress of 120N/mm2. The solid length of the spring is 45mm. Take C = 40000 MPa

Findd) The wire diameter e) The mean diameterf) The number of coils

4. A flat spiral spring of is made of a strip 6mm wide 0.25mm thick and 12m long & The torque applied at the winding spindle and 9 complete turns are given calculate Torque, maximum stress & energy stored?

5. Leaf spring of semi-elliptic type has 11 plates each 9 cm wide and 1.5 cm thick. The length of spring is 1.5m. The plates are made of steel having a proof stress 650 MN\m2. To what radius should the plates be bent initially & From what height load 600N fall on to center of the spring if maximum stress is to be one-half of the proof stress. Take E = 200 GPa

6. A laminated wooden beam 10cm wide and 15cm deep is made up of three 5*10cm wide planks glued together to resist the longitudinal shear . The beam is simply supported over a span 2m. If the allowable shearing in the glued joint is 0.45 MN/m2, Find the safe concentrated load that the beam may carry.