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Give the properties and applications of Bakelite.
This is most common type of phenol formaldehyde. This is hard, thermosetting, dark coloured material.
Its major properties are:
1. Dielectric constant is 4.1.
2. Dissipation factor is 0.001.
3. Dielectric strength is 400 V/mil.
4. Its Volume resistivity is 1013 ohm-cm.
5. Its Maximum useable temperature is 3000F.
6. Water absorption is 0.13%in 24 hours.
Applications: This is widely used for moulded parts as lamp holders, instrument cases and small panels, as electrical parts and terminal blocks or appliances for example: plug holders and sockets.
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describe briefly any four internal conditioning methods
Activity to Learn The Handling Of Hazardous Chemicals: Use Of Fume Cupboard Previous you learn about the importance of fume cupboard and its usage. There are many chemicals whi
Explain Ferromagnetic materials Ferromagnetic materials are those with spontaneous magnetic alignment. Ferromagnetism is the property of a material to be powerfully attracted
Thermal spelling: The breaking or cracking or peeling off the refractory is known as spelling. A good refractory must show a good resistance to thermal spelling. Thermal spelling
The Transformer oil helps cool the transformer. Because it also gives part of the electrical insulation among internal live parts, transformer oil must remain stable at high tempe
A sample of water is found to contain , Temporary Mg hardness = 20mg/L,Calcium Sulphate =20 mg/L. Calculate Temporary and Pemanent hardness in water.
Refractoriness under load (RUL): This represents the resistance of a refractory material to the combined efforts of heat and load. RUL is the temperature at which the deformation
Objectives : After doing this exercise based on two different labs of Zoology/Botany/Chemistry Physics, you should be able to: 1. State the check in and check out procedure of
structure of EDTA and estimation of hardness of water by Edta method
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