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Suppose two resistors of impedance r1 and r2 are placed in series and held at different physical temperatures
We would like to model this series combination of noisy resistors as a single noiseless resistor with an impedance of together with a noise source with an effective temperature of . In short, we want the two models shown in the accompanying figure to be equivalent.
Assuming the noise produced by the two resistors is independent, what should , the effective noise temperature of the series combination of resistors, be? If the two resistors are held at the same physical temperature, is the effective temperature equal to the true common temperature of the resistors?
What is the time constant of the circuit with S1 closed? What is the eventual steady-state current with S1 closed? What is the value of the circuit current at the first instant S1 is closed? (t = 0s)?
If f = 6 GHz, Z0 = 50 ,Cj = 0.1 pF, Rr = 0.5 , Rf = 0.3 , and Li = 0.4 nH, determine the insertion losses for the ON and OFF states.
The heater element of an electric kettle has a constant resistance of 100 Ω ohm and the applied voltage is 250 V. Calculate the time taken to raise the temperature of one litre of water from 15°C to 90°C assuming that 85% of the power input
Determine the time of operation of 5A , 3 Seconds over current relay having a current setting of 150% and a time setting multiplier of 0.8 connected to supply circuit through a 500/5 current transformer when the circuit carries a fualt current ..
The probability density function (PDF) of a continuous random variable is given in Fig.- Calculate the Continuous Distribution Function (CDF) and do its plot.
The amount of sunshine on a horizontal surface at the equator is 5kWh/m2/day. Suppose a house is to run entirely off grid on solar electricity alone using a high performance silicon photovoltaic module with specifications shown below: Maximum powe..
Calculate the potential at the center of the charge distribution and calculate the magnitude and direction of the electrical force on unit length of wire.
A 40-hp, 500 V, 1200-rpm DC shunt motor has rotationallosses of 2000 W at rated speed. The armature resistance is 0.46Ω and the field resistance is300Ω. A) Calculate the armature current when the motor is delivering rated load at rated voltage and..
design a negative edge-triggered d flip-flop that uses three sr latches constructed with cross-coupled nor gates.
The Signal power to noise power ratio is an important measure of the transmission quality of any channel. If at the receiver there is a 12 dB signal to noise ratio and the received signal power is 50 micro W then calculate the received noise power..
Find the average power loss and power factor for each of the circuits whose input current and voltage are as follows:
a four pole 60hz 50 hp synchronous motor has an applied line voltage of 480 volts and draws 60a from the line. it is
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