Recent questions tagged insulating

Description : State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 

Last Answer : The insulating materials used in motor are as belows: 1. Cotton, 2. Silk, or paper, 3. Press board, 4. Resins 5. PVC 6. Cellulose-Fiber, 7. Enameled coating, etc  ... Over 180° Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.

Description : State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material. 

Last Answer :  (i) Application of PVC paper : 1. It is used in slot lining or motor winding insulation purpose 2. For Insulation of Transformer winding (ii) Application of Porcelain : 1. Mainly used for manufacturing ... on withstand temperature : * H' & C' Class of insulation i e. 180° and above 180°C 

Description : State the type of insulating materials under Class Y and Class B.

Last Answer : The type of insulating materials under Class Y : 1. Cotton  2. Silk 3. Paper 4. Rubber 5. PVC The type of insulating materials under Class B: 1. Backelite 2. Impregnated varnish 3. Mica 4. Fiber glass 5. Asbestos 

Description : State gaseous and liquid insulating material.

Last Answer : i) Gaseous insulating material : 1. Air 2. Nitrogen 3. Hydrogen 4. SF6 ii) liquid insulating material: 1. Transformer oil 2. Capacitor oil 3. Cable oil 4. Pyranol 5. Savotal 6. Savol 7. Vegetable oil 8. Silicon liquids

Description : State properties of insulating materials.

Last Answer : (i) Resistivity should be very high. (ii) It should be water resistant. (iii) It should not contain impurities. (iv) It should not be affected chemically and not corroded easily. (v) Its ... It should be mechanically strong (tensile strength should be more). (vii) It should not be porous.

Description : Based on temperature withstanding ability, classify insulating material. 

Last Answer : class Temperature withstanding ability in 0C Materials Y 90 Cotton, silk paper and similar organic materials neither impregnated nor immersed in any oil, rubber, PVC. A 105 ... rubber compounds C Above 180  Mica, ceramics, glass, Teflon, quartz, etc. 

Description : List four examples of insulating material and explain any two.

Last Answer : Examples of insulating materials:  i) Solid: Ceramic, Porcelain, Mica, Glass, Rubber, Resinous, Fibers  ii) Liquid: Synthetic, Mineral etc.  iii) Gaseous: Hydrogen, Air, ... and low hygroscopicity.  Uses: Insulation in electric field, transformer stampings, armature, pole stampings

Description : What is dielectric strength of an insulating material? What is its unit?

Last Answer : Dielectric Strength: The dielectric strength of an insulating material is the maximum voltage which the insulating medium can withstand without breakdown. Unit is volts per millimeter (V/mm), or kV/mm or kV/cm

Description : Explain the mechanical properties of insulating materials.

Last Answer : i) Mechanical strength: Mechanical strength depends on temperature and humidity. a) Temperature: High temperature badly affects the mechanical strength of insulating material. While selecting material ... material should have property of easy moulding and machined into required shape and size.

Description : What are insulating material?

Last Answer : Insulating material: Insulating material is that which offers very high resistance to the flow of current through it.

Description : The electric breakdown strength of insulating materials depends on  (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these

Last Answer : The electric breakdown strength of insulating materials depends on  (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these

Description : Insulating materials have the function of?

Last Answer : Insulating materials have the function of preventing an open circuit between the voltage source and the load.

Last Answer : The insulating material used between the commutator segments is normally mica.