__Question No.1__

**Explain notch sensitivity. State the relation between stress concentration factor and notch sensitivity.**

** Answer**:

Notch sensitivity (*q*) is the degree to which the theoretical effect of stress concentration is actually reached.

The relation is, Kf = 1 + *q *(Kt-1)

__Question No.2__

**What are the factors that affect notch sensitivity?**

** Answer**:

The factors effecting notch sensitivity are:

1. Material

2. Notch radius

3. Size of component

4. Type of loading

5. Grain Structure

__Question No.3__

**What is the use of Goodman & Soderberg diagrams?**

** Answer**:

They are used to solve the problems of variable stresses.

__Question No.4__

**Define machinability**

** Answer**:

It is the property of the material, which refers to a relative ease with which a material can be cut. It is measured in a number of ways such as comparing the tool life for cutting different material

__Question No.5__

**What is an S-N Curve?**

** Answer**:

An S- N curve has fatigue stress on ‘Y’ axis and number of loading cycles in ‘*X’ *axis. It is used to find the fatigue stress value corresponding to a given number of cycles.

__Question No.6__

**What is curved beam?**

** Answer**:

In curved beam the neutral axis does not coincide with the centroidal axis.

__Question No.7__

**Give some example for curved beam.**

** Answer**:

C frame, crane hook

__Question No.8__

**What is principle stress and principle plane?**

** Answer**:

A plane which has no shear stress is called principle plane the corresponding stress is called principle stress.

__Question No.9__

**Write the bending equation.**

** Answer**:

The bending moment equation is, M/I = f/y= E/R,

Where,

M – Bending moment (M is in N-mm)

I – Moment of inertia about centroidal axis (I is in mm⁴)

f – Bending Stress (f is in N/mm²)

y – Distance from neutral axis (y is in mm)

E – Young’s modulus (E is in N/mm²)

R – Radius of curvature (R is in mm)

__Question No.10__

**Write the torsion equation.**

** Answer**:

The torsional equation is, T/J = q/r = GӨ/L

Where,

T – Torsional moment (T is in N-mm)

J – Polar moment of inertia (J is in mm⁴)

q – Shear stress in the element (q is in N/mm²)

r – Distance of element from centre of shaft (r is in mm)

G- Modulus of Rigidity (G is in N/mm²)

Ө – Angle of twist (Ө is in radians)

L – Length of the shaft (L is in mm)

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