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Frank D. Drake, an investigator in the SETI (Search for Extra-Terrestrial Intelligence) program, once said that the large radio telescope in Arecibo, Puerto Rico, can detect a signal which lays down only a picowatt of power over entire surface of the Earth. What is the power received by the radio telescope if the diameter of the antenna is 300 m? What would be the power of the source at the center of our galaxy which could provide such a signal? The center of galaxy is 22000 light years away. Assume that source is radiating uniformly in all directions and that the Earth is a disk with the radius of 6378 km.
A negative feedback amplifier has a close-loop gain Af=100 and an open-loop gain A=105. What is the feedback factor If a manufacturing error results in a reduction of A to 103, what close-loop gain results
A temperature sensor is specified to provide 2 mV/°C. When connected to a load resistance of 10 k ohm, the output voltage was measured to change by 10 mV, corresponding to a change in temperature of 10°C.
Explain the operation of sequential logic devices and evaluate the output waveform in relation to the clock for QA, QB and QC in the subsequent circuit and show the binary sequence represented by these waveforms
1.The S12G128 CPU board has one IRQ pin. You have four devices that will request interrupt service. How do you determine which device(s) need service 3.A communications channel has a bandwidth of 2,000 Hz and a signal-to-noise ratio (SNR) of 40 dB.
What is the range of decimal numbers that can be represented in 16-bit register assuming the following (a) Numbers are unsigned (b) Numbers are signed (in signed-magnitude representation)
If a transformer has a turns ratio of 1:5 and a primary voltage of 20 V AC, what will the secondary voltage be?
What is the maximum output resistance that the source follower must have if the output voltage is to remain within ±20% of nominal value. If the MOSFET has kn = 16 mA/V2, at what current ID must it be biased. At what overdrive voltage is the MOSFE..
A constant current I is flowing in a semi infinite loop. Find magnetic field intensity at the origin: H(0,0,0). Use magnetic field intenisty for a piece of wire.
In the Wheatstone bridge resistance measurement experiment, if Rx = 4 k-ohm, what would be the expected ohmmeter reading of the potentiometer's resistance
In the question below only focus on the parameter or parameters that are relevant to the particular property you are being asked about in the particular question. If you need to constrain a parameter to satisfy the stated criterion.
two loads connected in parallel are supplied from a single phase 240v rms source. the two loads draw a total real power of 400 kw at a power factor of 0.8 lagging. one of the loads draws 120 kw at a power factor of 0.96 leading.
The steering wheel of a car has a radius of 0.11 m, while the steering wheel of a truck has a radius of 0.28 m. The same force is applied in the same direction to each. What is the ratio of the torque produced by this force
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