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a 500kva 3-phase 50hz transformer has a voltage ratio of 33/11kv and is delta/star connected. the resistances per phase are high voltage 35v,low voltage 876v and the iron loss is 3050w.
A 10μF capacitor is charged by a constant current source and it's voltage is increased to 2V in 5s. Find the value of the constant current source.
How to write and application note that explains the use of AA sized rechatgeable batteries as a replacement for non-rechargeable alkaline barreries in a digital camera
Air enters an adiabatic nozzle steadily at 300 kPa, 20076;C, and 30 m/s and leaves at 100 kPa and 180 m/s. The inlet area of the nozzle is 80 cm2. Determine (a) the mass flow rate through the nozzle
The average power used by the resistor is what you pay to the electric company, but there is also reactive power for which you do not. The complex power supplied to the circuit is defined as: P = &f
inductor L and assume they have been connected for Consider a circuit consisting of a sinusoidal source V s (t) = cos (t) u (t) volts connected in series to a resistor R and an a very long time.
Consider a circuit consisting of a sinusoidal source V s (t) = cos (t) u (t) volts connected in series to a resistor R and an inductor L and assume they have been connected for a very long time. Let
Find the enthalpy of steam at 0.4 MPa and 0.7 dryness and determine the amount of heat required to convert 4Kg of water at t=38 degrees C into dry saturated steam at 1 MPa gauge pressure
A TV signal (Audio and Video) has bandwidth of 4.5 MHz. The signal is sampled,quantized and binary-coded to obtain PCM signal. (a) Determine the sampling rate if the signal is to be sampled at a rate
Suppose we have a 10-V-peak sinusoidal voltage source. Draw the diagram of a circuit that clips off the part of the sinusoid above 5-V and below -4V. The circuit should be composed of ideal diodes,
Matrix multiplication is distributive. That is, for any four matrices A, B, C and D of appropriate size, the following two matrix multiplication equalities
Given 100-MHz clock signal, derive a circuit using D flip-flops to generate 50-MHz and 25-MHz clock signals. Draw a timing diagram for all three clock signals, assuming the flip-flops introduce no d
A Mealy sequential network has two inputs and one output. Whenever the input sequence 00, 10, 01, or 10, 01, 11 occurs the output is 1 coincident with the last input in the sequence. Find a state gr
A point charge of 10 C moves with a uniform veloctiy of 2ax - 4az m/s in an electromagnetic field having E = ax - 3ay + 8az V/m and B= 0.3ax + 0.1ay. Find the force on the charge due to the electric
a) Find the voltage across the inductor for t > 0. (Assume the passive sign convention.) b) Find the power (in microwatts) at the terminals of the inductor when t = 200 ms. c) Is the inductor absor
Gratings are often written into photoresist by interference (superposition) of optical beams. In other words, the standing wave formed by the overlap of multiple plane waves produces a (useful) exp
design an n-channel silicon JFET with pinch off voltage (-2V). The channel is doped with Arsenic and the gate is doped with Boron. the Boron density is 1019 atoms /cm-3 all atoms are fully ionized.
Provide an ideal mixing operation with a 10-kHz local oscillator having an amplitude of 2, and eliminate the undesired component by using a band-pass filter centered at 20kHz. The bandwidth should b
If we were to use the same number of bits for all symbols in this set, how many would we need for each symbol. In the parts below, assume we are using a compression method that takes advantage of the
Suppose you have a set of 10 symbols. Assume that in an average text each symbol appears as frequently as any other. (i) What is the relative frequency of each symbol (ii) What is the entropy of this
What is the x-intercept of this tangent line? Use this fact to draw the tangent line and find the volume of the solid generated by rotating the top half
Assume the ASCII code is used for each character with an additional parity bit (in the most significant bit position, at left). Each character in ASCII is using 8 bits. Even parity is used. What eng
For example, if you have the two 3-bit words 000 and 110, you know that the first word is correct (even parity), the second word is correct (even parity), the first column is correct (odd parity), t
If an amplifier has an internal resistance of 500O, what turns ratio must be used to get maximum power transfer to a load of 4O.
A parallel circuit contains four branches with resistors values of 4.7k, 5.6k, 8.1k and 10k. Which branch has the largest current flow