In the textbox below, using your ideas of forces, partial charges or electrons, distortions, energy, and interactions, draw AND explain how permanently electretized fibers in the N95 mask attract particles of all sizes. What causes the particles to approach the electretized fibers? (Hint: this is the essence of what your

In the textbox below, using your ideas of forces, partial charges or electrons, distortions, energy, and interactions, draw AND explain how permanently electretized fibers in the N95 mask attract particles of all sizes. What causes the particles to approach the electretized fibers? (Hint: this is the essence of what your

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...

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The temperature dependence of resistance is also quantified by the relation R2=R1[ 1+(T2T1) ] where R1 and R2 are the resistances at temperatures T1 and T2, respectively, and is known as the temperature coefficient of resistance. If a copper wire has a resistance of 55 at 20C, find the maximum permissible operating temperature of the wire if its resistance is to increase by at most 20. Take the temperature coefficient at 20C to be =0.00382.
You are working as an electrician in a large steel manufacturing plant, and you are in the process of doing preventive maintenance on a large DC generator. You have megged both the series and shunt field windings and found that each has over 10 M to ground. Your ohmmeter, however, indicates a resistance of 1.5 across terminals S1andS2. The ohmmeter indicates a resistance of 225 between terminals F1andF2. Are these readings normal for this type machine, or is there a likely problem? Explain your answer.
A string of 8 suspension insulators is to be fitted with a grading ring. If the pin to earth capacitances are all equal to C, find the values of line to pin capacitances that would give a uniform voltage distribution over the string.
Discussions:Voltage Distribution and String Efficiency of a Model Suspension Insulator 1- Comment on the results obtained.2- Give reasons for unequal potential distribution over the string.3- What is the effect of this un equality on the insulators?4- Can value of the string efficiency being equal to 100%. Explain your answer.5- Outline methods used to equalize the potential across the units.6- Why an insulator is represented as a capacitor C? What are the assumptionmodes?
Please explain the solution in detail? (Step-by-step solution). Such as why 9 is negative and etc.
Q-1: Give brief answer to the following: (Answer Ten only)1) what is the potential transformer used for in power substation?2) what is process leads to lowering the number of free electrons?3) what is The Townsend’s Criterion4) why Sulphur Hexafluorid has good insulation strength?5) What is Intrinsic Breakdown6) why do bubbles lead to breakdown of liquid?7) how to decease the ripple voltage of cockroft-walton voltage multiplier circuit8) how much the maximum charging current of A Van de Graaff generator has a beltwidth 1 m, a belt speed of 4 m/s, and charge density of 10 c/m29) Why does need for Reactive Power Compensation in test transformer?10) The output voltage of series resonant circuit is given by the formula _________11) what is impulse voltage and what is its standard wave shape?12) Which advice can measure impulse voltage?
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It is required to grade a string having seven suspension insulators. If the pin to earth capacitance are all equal to C, determine the line to pin capacitance that would give the same voltage across each insulator (C1, C2, …….C6) of the string.
4- Can value of the string efficiency being equal to 100%. Explain your answer.5- Outline methods used to equalize the potential across the units.6- Why an insulator is represented as a capacitor C? What are the assumptionmodes?
show complete solution INCLUDE FIGURES
If the same meter movement from no.1 is to be used in an Ayrton shunt arrangement, find the required resistances for 1 A, 500 mA and 100 mA ranges. (Given in no.1:A 500-Ω shunt resistance was connected to a 5-mA meter movement to form a 25-mA single range DC ammeter.)
A telephone line (cable) stretches between two points which are 150 ft apart and at the same elevation. The line sags 5 ft and the cable has a weight of 0.3 lb/ft. Determine the length of the cable and the maximum tension in the cable.