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Mica is an inorganic mineral. It is one of the best natural insulating materials available. In spite of the tremendous progress made in insulation technology this material and its product still find many applications in the present day. The qualities of mica can be classified on visual basic such as clear, stained spotted, etc. Mica sheets are used for the insulating leaves between commentator segments. These are however not obtainable in large thickness. Thus for commentator of considerable dimensions mica has been developed. This is achieved by sticking mica splitting on sheets of paper by means of a drying varnish such as shellac. These sheets are pressed between steam heated plates and then cooled. Mica is used for slot linings of have machines and for making bushes. Mica is usually avoided for slot linings of machines because its space factor is low. This means that adequate dielectric strength may be obtained with thinner layers of cotton tape and like materials than of mica.
To free a charged a particle freely in air under the persuade of electric field its downward weight should be balanced by upward electric force for instance if a positive charge is
Capacitor-start-capacitor-run single-phase motor : In this case, two capacitors are used one for preliminary and other for running purpose as shown. The capacitor used for prelimin
Volume resistance: The resistance provided to the current which flows through the material is called volume resistance. For a cube of unit dimensions this is called volume resisti
During light activity, a 70-kg person may generate 200 kcal /h. Assuming that 20% of this goes into useful work and the other80% is converted to heat, calculate the temperature ris
Q. Illustrate that water drain counter clockwise in the northern hemisphere and clockwise in the southern hemisphere? Answer:- This isn't a myth. It drains counter clockwi
GM counter
Questions: Regard as two charged particles at a separation of 4 cm. Particle #1 has a charge of +2 micro-coulombs. Particle #2 has a charge of +16 micro-coulombs. How does the
What are the basic components of Lead Acid Cell? Ans. Basic Components of Lead Acid Cells are: (i) Positive Plates which are tubular in shape prepared by PBO 2 . (ii) N
Chemical action in lead acid battery: When the lead acid battery is delivering current, the sulphuric acid breaks up into Hydrogen ions (H 2 ) carrying a positive charge and Su
A well-insulated electric water heater warms 109 kg of water from 20.0°C to 49.0°C in 25.0 min. Find the resistance of its heating element, which is connected across a 240-V potent
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