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Use the equivalent circuit of Figure 11.17 to derive the expression for the short-circuit current gain of a bipolar transistor. Assume a unilateral device, where Cc = 0.
A 75- ohm lossless transmission line is interfaced to a load impedance that consists of a series connected resistor of 30 ohm and a capacitor of 10 pF. At an operating frequency of 2 GHz and for a wavelength of 10 cm.
A rifle fires a 1.20 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 6.74 x 10-2 m from its unstrained length.
A given signal f(t) is multiplied by this periodic signal. Determine an expression describing the spectrum and the time waveform of the resulting amplitude-modulated signal if all componets except those centered at + Wc
Discuss what is meant by line spectra and what information can be gathered from a line spectrum plot. Discuss the similarities and differences between the Fourier Transform and the Laplace Transform.
Two equal resistors R connected in series across a voltage source V dissipate power P. What would be the power dissipated in the same resistors when they are connected in parallel across the same voltage source
A synchronous motor is rated as 250 hp, 4.8 kV connected 60 Hz 12 poles with Xs=0.6 pu and Rs=0.01 pu. The motor rotational losses are 1.5 kW and the excitation power is 6 kW. The motor is supplied by rated voltage at the stator.
A stream of warm air with a dry-bulb temperature of 40°C and a wet-bulb temperature of 32°C is mixed adiabatically with a stream of saturated cool air at 18°C. The dry air mass flow rates of the warm and cool airstreams are 8 and 6 kg/s, respectiv..
GaAs is composed of equal numbers of atoms of gallium and arsenicin a lattice similar to that of silicon. Suppose a siliconatom replaces a gallium atom in the lattice. Do you expect the silicon atom to behave as a donor or acceptor impurity
A -find the dc collector current and the dc voltage at the collector. B Replacing the trasistor by its T-model, draw the small signal equivalent circuit of the aplifier. Analyze the resulting circuit to determine the voltage gain vo/vi.
(a) How long does the electron take to travel this 1.50 cm? (b) What is its acceleration?
A square in the x-y plane in free space has a point charge of+Q at corner (a/2, a/2), the same at corner (a/2, -a/2), and apoint charge of -Q at each of the other two corners. (A) Find the electrical potential at any point P along thex-axis.
An analog system has a bandwidth of 10 MHz, a photodetector of = 0.5 A/W and ID = 1 nA, and a signal to noise ratio (SNR) of 30 dB. The receiver's temperature is 270 C and the load resistance is 50 .
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