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Q. Explain the compositional defects.
Ans. Compositional Defect: This defect due to
(a) Alloying an element to original crystal.
(b) Impuring atom during original crystallization.
These defects are responsible for functioning of most semiconductor devices.
A substitutional impurity defect is also a point defect in which a foreign atoms that substitutes for a parent atom in the crystal lattice e.g. in bras, zinc is a substitutional atom in the copper.
A interstitial impurity is a small sized atom occupying space between the regularity positioned atoms.
Principles of fire risk assessment: The following principles of FRAs apply in the UK as they do in the USA: justifying assumptions, stating data sources,
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Exhaust Section Inspection. Inspection of the exhaust section of the engine can be done visually using an appropriate light source. The exhaust cone and jet pipe are examined
Q. Explain the following terms. (i) Flash in forging. (ii) Fullering and up setting in forging. (iii) Trimming of
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logic gate-OR gate Figure shows the symbol that represents a 2 input OR gate together with its truth table. This gate will adopt a 1 state at its output terminal when either
Q. What are the commented carbides? How are they processed? Ans. These are very important products of powder metallurgy and finds wide applications as cutting tools, wir
Types of patterns : These depends upon many factors like the bulk of casting, type of moulding processes, number of castings required and the anticipated difficulty of moulding,
Allowances for pattern : A pattern is always made larger than the required size of the casting in order to allow for various factor, such as shrinkage, machining, distortion and r
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