# PAPER IV APPLIED MECHANICS & STRENGTH OF MATERIALS Dr. MGR University 2013 - 2015 Question Papers

## Dr. MGR University AUGUST 2013 Question PaperSubject : PAPER IV  APPLIED MECHANICS & STRENGTH OF MATERIALS

[LD 0212] Sub. Code: 2404
BACHELOR OF PROSTHETICS AND ORTHOTICS (BPO)
FIRST YEAR
PAPER IV – APPLIED MECHANICS & STRENGTH OF MATERIALS
Q.P. Code: 802404
Time : Three Hours Maximum : 100 marks
I. Elaborate on: (3 x 10 = 30)
1. Explain the stress-strain diagram with a neat sketch.
2. Find the centroid of an inverted T-section with flange 150 x 20mm and
web 100 x 25 mm.
3. A beam is freely supported over a span of 8 meters. It carries a point load of 3 KN
at 2 m from the left hand support and a uniformly distributed load of 2 KN/m run
from the centre to the right hand support. Construct Shear force diagram and
bending moment diagram.
II. Write notes on: (8 x 5 = 40)
1. Define uniform acceleration and types of motion.
2. Define force and what are the types of forces?
3. Explain the working stress, bulk modulus and factor of safety.
4. A circular steel bar 20mm diameter carries tensile load of 30 KN. Find the tensile stress
and elongation of the bar in a length of 300mm. Take E= 2 x10^5 N/mm².
5. Define centre of gravity and centroid.
6. Determine the diameter of solid shaft which is transmitting 100Kw at 160 rpm.
Also determine the length of the shaft if the twist must not exceed 1°, maximum
shear stress is limited to 60 N/mm² and N = 0.8x10^5 N/mm².
7. A closely coiled helical spring is made of steel wire 12 mm diameters. The number
of coil is 20 and mean radius of coil is 75 mm. Calculate the stiffness of the spring
if N= 1.2 x10^5 N/mm².
8. Define ergonomics with relevant example.
III. Short Answers on: (10 x 3 = 30)
1. Define scalar and its properties with an example.
2. Define torque.
3. Define strain.
4. Define ultimate stress.
5. What are the types of loads acting on a body.
6. Difference between open coiled spring and closed coil springs.
7. Define friction.
8. Define moment of inertia.
9. Define fatigue.
10. Define mechanics.
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## Dr. MGR University AUGUST 2014 Question PaperSubject : PAPER IV  APPLIED MECHANICS & STRENGTH OF MATERIALS

[LF 0212] Sub. Code: 2404
BACHELOR OF PROSTHETICS AND ORTHOTICS (BPO)
FIRST YEAR
PAPER IV – APPLIED MECHANICS & STRENGTH OF MATERIALS
Q.P. Code: 802404
Time : Three Hours Maximum : 100 marks
I. Elaborate on: (3 x 10 = 30)
1. A mild steel bar 2m long 20mm Wide and 10mm thick is subjected to an
axial pull of 20KN. Calculate the change in Length, Width, Volume and Thickness.
E = 2 x 105 N/mm2
.
2. Explain the various types of loads and beams with a simple sketch.
3. A closely coiled helical spring is made of steel wire 10 mm diameter has 10 coils of
120mm mean diameter. Calculate the deflection and stiffness of spring under an axial
load of 98 N. Take N=1.2x10^5 N/mm².
II. Write notes on: (8 x 5 = 40)
1. What is force? What are the types of forces? Differentiate any two.
2. An air plane accelerates down a runway at 2.20 m/s² for 28.8s until is finally
lifts off the ground. Determine the distance travelled before take off.
3. Define stress, strain and bulk modulus.
4. Define centroid and moment of inertia.
5. Define friction and coefficient of friction, with an example.
6. Define Ergonomics and its purpose
7. Resultant of forces.
8. State polygon law of forces and triangle law of forces.
III. Short Answers on: (10 x 3 = 30)
1. Define Lami’s theorem.
2. Define vector with an example.
3. Define acceleration.
4. What is working stress?
5. Define factor of safety.
6. What are the types of pollutions?
7. What is mean by fatigue?
8. What is a spring?
9. Define center of gravity.
10. Define power and energy.
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## Dr. MGR University AUGUST 2015 Question PaperSubject : PAPER IV  APPLIED MECHANICS & STRENGTH OF MATERIALS

[LH 0815] Sub. Code: 2404
BACHELOR OF PROSTHETICS AND ORTHOTICS (BPO)
FIRST YEAR
PAPER IV – APPLIED MECHANICS & STRENGTH OF MATERIALS
Q.P. Code: 802404
Time : Three Hours Maximum : 100 marks
I. Elaborate on: (3 x 10 = 30)
1. Find the Centroid of the bent Wire as shown in below figure:
2. Draw the shear Force and Bending Moment Diagrams for the cantilever beam
as shown below.
3. A steel Bar ABCD is given below. Determine stresses in different parts and total
elongation.
Take E= 2x105 N/mm2
II. Write notes on: (8 x 5 = 40)
1. A force system is give below. Determine Magnitude and Direction of the resultant
force with respect to 45N Force.
2. State the assumptions made in the theory of pure torsion.
3. Derive the expression for bending equation for bending of a beam after assuming the
necessary assumptions
4. Define Punching shear and Hoop stress.
5. Calculate the MI of circle about XX and YY axis if MI about ZZ axis is 5 x 1012 mm 4.
6. State the assumptions made in the theory of simple bending.
7. A circular column having 500mm diameter is carrying a load of 180kN at an
eccentricity of 300mm from the centrodial axis. Determine the maximum and
minimum stresses induced in the section.
8. State laws of dry friction.
III. Short Answers on: (10 x 3 = 30)
1. Draw stress-strain diagram for ductile material.
2. Define point of contra flexure.
3. Define moment of resistance.
4. Define shear stress.
5. What is fletched beam?
6. What is meant equivalent length of column?
7. State the maximum SF induced in a cantilever of span 4m and carrying a
point load of 30kN at its free end.
8. Calculate polar MI of square section having 200mm as side.
10. What are the conditions of equilibrium of rigid bodies?
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