Postpone the examinations of Sections A & B

Due to the prevailing uncertain situation, it has been decided to postpone the examinations of Sections A & B scheduled to be held from 6 Jun 2020 to 12 Jun 2020 Rescheduling of Summer 2020 Examinations In the light of the COVID-19 pandemic and the instructions and guidelines issued by the Government of India, the…

By Sdbamie 3 May 2020 0

Atmosphere, Hydrosphere and Lithosphere

18) Write brief notes on atmosphere, hydrosphere and lithosphere. The global environment consists of atmosphere, hydrosphere and lithosphere in which the life-sustaining resources of the earth are contained. The atmosphere , which is a mixture of various gases (mainly nitrogen, oxygen, carbon dioxide and water vapour) extending outward from the surface of the earth, evolved…

By Sdbamie 3 May 2020 Off

Ones’ complement

8) Ones’ complement Alternatively, a system known as ones’ complement can be used to represent negative numbers. The ones’ complement form of a binary number is the bitwise NOT applied to it — the complement of its positive counterpart. Like sign-and-magnitude representation, ones’ complement has two representations of 0: 00000000 (+0) and 11111111 (−0). As…

By Sdbamie 1 May 2020 Off

Adders (electronics)

7) Adders (electronics) In electronics, an adder is a device which will perform the addition, S, of two numbers. In computing, the adder is part of the ALU, and some ALUs contain multiple adders. Although adders can be constructed for many numerical representations, such as Binarycoded decimal or excess-3, the most common adders operate on…

By Sdbamie 1 May 2020 Off

Electrical Properties

17) Electrical Properties Electrical Conduction 17.2 Ohm’s Law When an electric potential V is applied across a material, a current of magnitude I flows. In most metals, at low values of V, the current is proportional to V, according to Ohm’s law: I = V/R where R is the electrical resistance. R depends on the…

By Sdbamie 1 May 2020 Off

Composites

16) Composites 16.1 Introduction The idea is that by combining two or more distinct materials one can engineer a new material with the desired combination of properties (e.g., light, strong, corrosion resistant). The idea that a better combination of properties can be achieved is called the principle of combined action. New – High-tech materials, engineered to…

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Polymers Characteristics, Applications and Processing

15) Polymers Characteristics, Applications and Processing 15.2 Stress-Strain Behavior The description of stress-strain behavior is similar to that of metals, but a very important consideration for polymers is that the mechanical properties depend on the strain rate, temperature, and environmental conditions. The stress-strain behavior can be brittle, plastic and highly elastic (elastomeric or rubber-like). 1.…

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Polymer Structures

14) Polymer Structures 14.1 Introduction Polymers are common in nature, in the form of wood, rubber, cotton, leather, wood, silk, proteins, enzymes, starches, cellulose. Artificial polymers are made mostly from oil. Their use has grown exponentially, especially after WW2. The key factor is the very low production cost and useful properties (e.g., combination of transparency…

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Ceramics – Applications and Processing

13) Ceramics – Applications and Processing 13.1 Introduction Ceramics properties that are different from those of metals lead to different uses. In structures, designs must be done for compressive loads. The transparency to light of many ceramics leads to optical uses, like in windows, photographic cameras, telescopes and microscopes. Good thermal insulation leads to use…

By Sdbamie 1 May 2020 Off

Ceramics – Structures and Properties

12) Ceramics – Structures and Properties 12.1 Introduction Ceramics are inorganic and non-metallic materials that are commonly electrical and thermal insulators, brittle and composed of more than one element (e.g., two in Al2O3) Ceramic Structures 12.2 Crystal Structures Ceramic bonds are mixed, ionic and covalent, with a proportion that depends on the particular ceramics. The…

By Sdbamie 1 May 2020 Off