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The following readings are taken from the result of anopen-end and a short circuit test on a 9375-kVA three-phaseY-connected 13,800-V (line to line) two pole 60 Hz turbinegenerator driven at synchronous speed:Field currentA 169 192Armeture current, short-curcuit test,A 392 446Line Voltage, open-circuitcharacteristic,V 13,000 13,800Line voltage, air gap line,V 15,400 17,500The armature resistance is 0.064 Ω /phase. The armeture leakage reactance is 0.10 per unit on the generator rating as abase. Find(a) the unsaturated value of the synchronous reactance inohms per phase and per unit, (b) the short-circuit ratio, and (c)the saturated reactance in per unit and ohms per phase.
A Si is doped with 10^14 boron atoms per cm3. For T=300 K and T = 470 K. Determine the position of Ei, compute Ef-Ei, and draw a careful dimensioned energy band diagram for the Si sample. Note for Si Eg=1.1 eV, mp*/mn*=0.71. ni=10^14 cm-3 at 470 K
The American Standard Code for Information Interchange (ASCII) has 128 binary-coded characters. If a certain computer generates 100,000 characters/second, determine the following: a. The number of bits (binary digits) requiredper character.
Determine the ROM size and contents to implement a function which converts a sign and magnitude number from -5 to +6 to two's complement format.
For each one of the 3 frequency responses, H(f), in parts (a), (b), and (c) do the following: i. Obtain the system's impulse response, h(t). ii. Indicate if the system is BIBO stable or not, and state why. iii. Indicate if the system is causal or not..
A silicon abrupt junction, approximated by a step junction, has a doping of NA= 5 x1015/cm3 and ND= 1015/cm3 and a cross-sectional area (A) of 10-4cm2. Assume the depletion approximation, VA=0, and ni=1010/cm3 to: a. Calculate Vbi.
A sirloin steak (e'r = 52.4, µr = 1, tan dc = 0.33) is to be heated in a microwave oven operating at 2.45 Ghz. (a) Determine the uniform plane wave penetration depth. (b) Determine the complex impedance of the material.
a). If the 8th bit is set to0, what is the minimum Hamming distance between the 8-bit ASCII character code words b). If the 8th bit is usedfor parity, what is the minimum Hamming distance between the 8-bitASCII character code words
Write a C program for the 68HCS12 microcontroller to send the pattern 0x55 to byte-sized Memory Location "OUT1" and then call a delay function. The delay function should generate a delay of two milliseconds.
For what range of values of a is the system stable?
A small businessman planes to start a taxi -service and purchased a new car for #36000 with borrowed money at 15% compounded annually , his net income is $12000 per year and the salvage value of the car at the end of 4 years is $5000.
A silica fiber has an outer diameter of 125 micro meter. What is the total volume of silica for a 1-km length? This fiber is wound on a spool whose unloaded diameter is 20 em. The spool height is 10 em. Compute the diameter of the fully loaded spo..
A circuit element is hidden inside a potato sack and draws a current which varies with time t, measured in seconds, i(t) = 0.04 e(-4400 · t) Amps, while the voltage drop across this element is given by the function v(t) = 6.061 (1 - e(-4400 · t)) ..
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