Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Explain how materials can be classified into three groups on the basis of atomic structure.
An atom has a positively charged nucleus surrounded through a group of negatively charged electrons. This nucleus is at the centre of the atom and electrons are established in definite states, energy-levels and orbits. The electrons in the outermost orbit of an atom are termed as valence electrons. This is these electrons which are responsible for finding the physical, electrical and chemical properties of the material.
The materials are classified on the basis of atomic structure:
1) When the number of valence electrons of an atom is less than 4 that is half of maximum permissible 8 electrons, the material is a conductor or metal. Illustration Cu, Al and Mg have 1, 2 and 3 valence electrons correspondingly.
2) When the number of valence electrons of an atom is more than 4, the material is an insulator. Illustration, Se and Bromine consist of 5, 6 and 7 valence electrons correspondingly.
3) When the number of valence electrons of an atom is 4 that are exactly half of maximum permissible 8 electrons, therefore the material is a semiconductor. Illustration Carbon, Silicon and Germanium consist of 4 valence electrons each.
Considering the circuit shown in Figure (a), find the state of operation and operating point if the BJT has β = 80 and other typical values of a silicon BJT at room temperature.
what is pole core and pole shoe in a dc machine
Factors of Contributing to Losses in Service Cables 1. Tapping of underground service cables: The service cables must be visible so that tapping of cables can be detected. U
define
write down the debroglie equation
Design a suitable double –layer lap winding for a 6-pole dc armature with 18 slots and two coil sides per slot. Give values of front-pitch, brack–pitch and commutator pitch. Draw t
Q. An RG-139/U rectangular waveguide is given to have dimensions a = 0.8636 mm and b = 0.4318 mm. Compute the theoretical and practical frequency ranges of operation for the guide.
explain the operation of a detector probe
Q. What is Segment displays? Seven-segment displays are the most commonly used numeric display devices, while 10- and 16-segment (starburst) display devices are also available.
The covers of electrical machines are made of (A) Soft magnetic materials. (B) Hard magnetic materials. (C) Super conductors. (D) Semicond
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd