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·Insulators are a vital part in transmission system they held the overhead transmission line and provide a mechanical support besides they act as an electrical insulator to insulate the line from the supporting system ( pole, tower...etc.)·If you have a 33 kV overhead line, there are three units in the string of insulators.If the capacitance between each insulator pin and earth is 11% of self-capacitance of each insulator.
What are the four characteristic parameters of transmission line? Which parameter is used to calculate the real loss? Which parameter is used to calculate the charging current? Which parameter is almost negligible and why?
A current source of 12 cos2000t A, a 200 ohm resistor, and a 0.2 H inductor are in parallel. Assume steady-state condition exist. At t=1ms, find the power being absorbed by the (a) resistor; (b) inductor; (c) sinusoidal source.
The discussion must address phase angle relationships of current and voltage. The answer must include the effect of source frequency on the voltage drolps across the resistor and the inductor at very loave and very high frequency values.
An electric pencil sharpener is rated 240 mW, 6 V is connected to a 9-V battery and a series-dropping resistor Rx needed to power the sharpener. Calculate the value of the series-dropping resistor Rx needed to power the sharpener.
What are the difference betwen those circuits ? (MCB/MCCB/ ELCB /RCBO/ RCCB)
One superhet, one homodyne, and one that downconverts to baseband receiver is operating in 700-750MHz. Pick a set of IF and LO frequencies, and identify any issues (images, spurs, LO harmonics in receiver band, services that interfere with IF)
The 16giga-byte (GB=2^30 bytes) flash memory chip for an MP3player is 11mm by 15mm by 1mm. This memory chip holds 20,000photos. a) How many photos fit into a cube whose sides are 1mm
Suppose a pure Si crystal has 5 × 1028 atoms m-3. It is doped by 1 ppm concentration of pentavalent As. Calculate the number of electrons and holes. Given that ni =1.5 × 1016 m-3.?
Design a circuit that implements the logic circuit using the fewest total number oflogic gates.
Design a combinational circuit that takes two 3-bit binary numbers a2a1a0 and b2b1b0 and generates Modulo-8 addition. Recall that the MOD operation produces the remainder value in an integer division. (Note: Do not use any CAD tool.
A 13,800/480 V three-phase Wye-Delta-connected transformer bank consists of three identical 100-kVA 7967/480-V transformers. It is supplied with power directly from a large constant-voltage bus.
You must work the problem and also find the results using any of the available software (Mutisim, PSpice, Proteus, etc.) You will be asked to explain your results in next Class meeting (oral explanation).
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