VIVA QUESTIONS:
[1] Define elasticity.
[2] What is meant by plasticity?
[3] Define stress. What are the different types of sth
14] Define strain. What are the different types or SUI
[5] State Hooke's law of elasticity.
[6] Define modulus of elasticity. State the differ
ulus of elasticity. State the different moduli of elasticity.
[7] What are the possible sources of error in the Searle's method
es of error in the Searle's method to determine Y?
[8] Why are two identical wires of the same material used in Searle
[9] Why should the diameter of the wire be measured accurately!
[10] Why is it necessary to add deadload (zero load) to the wires?
Answers
[1] Elasticity: the quality that something has of being able to stretch and return to its original size and shape.
[2] Plasticity: the quality of being easily shaped or moulded.
[3] Stress: Stress is a physical quantity that defines force per unit area applied to a material.
Types:
There are six types of stress: compression, tension, shear, bending, torsion, and fatigue. Each of these stresses affects an object in different ways and is caused by the internal forces acting on the object. The internal forces are the result of how forces are applied to an object.
[4] Strain: Strain is simply the measure of how much an object is stretched or deformed. Strain occurs when force is applied to an object.
Types:
there are two types of strain that a structure can experience: 1. Normal Strain and 2. Shear Strain
[5] Hooke's law of Elasticity: states that, for relatively small deformations of an object, the displacement or size of the deformation is directly proportional to the deforming force or load.
[6] Modulus of Elasticity: An elastic modulus is a quantity that measures an object or substance's resistance to being deformed elastically when a stress is applied to it. The elastic modulus of an object is defined as the slope of its stress–strain curve in the elastic deformation region: A stiffer material will have a higher elastic modulus.
[7] the error in the measurements of d and l are the same. due to the error in the measurement of d is twice that due to the error in the measurement of l. due to the error in the measurement of l is twice that due to the error in the measurement of d.
[8] Error due to thermal expansion or contraction :- as you know, if temperature will be change(increase) then, thermal expansion occur in wire. As both dummy wire and experimental wire are of the same material and same original length,due to this change in length will be same for both the wires.
[9] Measure the diameter with calipers. Place an electrical wire between the jaws of a set of Vernier calipers. Slide the movable jaw around the cable without compressing the insulation and read the measurement where the line from the moving indicator meets the stationary scale for a diameter.
[10] Two identical wires A and B are suspended from a rigid support so that the points of suspension are very close to each other. Searle’s apparatus blocks are attached to the lower ends of the wires by means of chucks F1 and F2.
Searle’s apparatus block consists of two metal frames P and Q. The two frames are loosely connected by cross strips in such a way that the frame Q can move relatively with respect to frame P. A spirit level S is hinged to the frame P and is rested on the tip of a micromeer screw M which can work in a nut fixed in the frame Q.
At the lower end, each frame carries a hanger from which slotted weights can be suspended. Wire A is dummy wire from which a fixed load of about 1 kg (dead weight) is suspended.