1. The types of insulators includes Phase to Earth Insulation and Phase to phase Insulation a) Ture b)false 2- The main

[answerhappygod]

1 The Types Of Insulators Includes Phase To Earth Insulation And Phase To Phase Insulation A Ture B False 2 The Main 1 (81.25 KiB) Viewed 97 times

1. The types of insulators includes Phase to Earth Insulation and Phase to phase Insulation a) Ture b)false 2- The main function of Insulating materials is - weather resistance - Jextreme resistance to the voltage c-) heat resistance 3- SF6 gas are used as a) Insulator b) arc extinguishers c) both of them 4. When an alternating electric field is applied to the insulating material, the insulating material absorbs some energy and dissipates as losses in the form of a) Heat b) magnetic field c) stored energy 5- dissipation factor a) reactive power /active power b)active power / reactive power c) active power /apparent power 6 the loss factor will be approximately the same for all range of test voltages when insulation 6 is a) liquid b)solid c) perfect 7. The Power loss in a dielectric (PL): a) PL = v^2 • 2n Fcº tan 6 b) PL = v^2 21 FC CPL = v^2 - 2x F* tan 5 b6 8 tan affected by: a) space between conductors b) power transfer c) Magnitude of applied voltage 9. dielectric constant of vacuum is a) 1.006 b) 1 c) 2.5 10- Breakdown voltage is a lowest peak voltage at which a dielectric starts a) Conducting b) insulating c) flash over 11. Breakdown voltage it depend on a) insulation material b) frequency c) both of them 12- breakdown puncture is the spark is external (over the dielectric) ) a) true b) false ) b 13- The good gaseous insulator should be cheap and economic in addition non toxic, non corrosive a) True b) false 14- Vacuum has excellent properties for al electric arc quenching b) electric conduction c) electric transfer 15- Insulating fluids have properties represented by high values of loss factor, viscosity, pour point, and density in addition to gas absorbing capability a) True b) false 16- material of ceramic and glass is a) Organic b) inorganic c) metal 17. composites insulating material represent by a) solid/liquid b) liquid /gas c) solid /gas 18- if Liquid insulators absorb the solid particles the resistance, dielectric strength and dissipation factor of the insulator will be affected a) True b) false 19. The good composite components of insulation material react chemically under the conditions of heat, mechanical tension and electrical stress during the expected period of work of the insulator a) True b) false 20- Good insulating solids have a: a) low values of density b) good mechanical and bonding properties c) does not suffer any loss of the above properties during prolonged operation. Extra high voltage (EHU): ( Over 230v to 765 kW about 123 kv to 220 kv V high than 800 kV If the high voltage level is 400 kv and surge Impedance is 400 then the max power transfer is 400MN 60MN 1000MW In order to transfer more power required: : Increase the frequency of power systemeration decrease level voltage transmission line increase the level voltage of transmission line Hydroelectric power stations and nuclear power stations are necessary factors in the construction of high voltage transmission lines True false