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The amplifier in a battery-powered device is being designed to deliver 0.1 W to a set of headphones. The impedance of the headphones can be chosen to be 8 Ω, 32 Ω, or 1000 Ω. Calculate the voltage and current required to deliver 0.1 W to each of these resistances. Which resistance seems the best choice for a battery powered application?
The motor whose torque-speed characteristics are are shown below drives the load shown in the diagram. Some of the gears have inertia. Find the transfer function.
Reduce the following expression to a minimum sum of products form, using P1 through P12. Show each step (number of terms and number of literals in minimum shown in parentheses)g= abc +abd + bc'd' (2 terms and 5 literals)
The circuit shown in Figure P4.24 has been set up for a long time prior to t = 0 with the switch closed. Find the value of vC prior to t = 0. Find the steady-state value of vC after the switch has been opened for a long time.
A 200-MVA, 12-kV, 0.85-PF-lagging, 50-Hz, 20-pole, Y-connected water turbine generator has a perunit synchronous reactance of 0.9 and a per-unit armature resistance of 0.1. This generator is operating in parallel with a large power system (infinit..
Calculate the number of dangling bonds that may be included under the gate of a MOSFET for 45nm technology (assume cubic device geometry).
Convert the designed prototype filter to highpass filter with cutoff frequency f_C=10,000 Hz, with 30 db attenuation at f_S=1000 Hz. Determine the transfer function of the filter.
he power dissipated in the resistor R0 is 24 W when connected to a 10V source. Find the total dissipated power if 3 resistors identical to R0 are connected in series to a 10V source.
Design a BJT differential pair amplifier (balanced in, unbalanced out) that provides 20 dB differential gain and 40 dB CMRR. Assume b = 100, ro = 50 KW. Use dual dc power supplies +Vcc and -Vee.
Rewrite the MATLAB simulation of Computer Example 4.3 for the case of an absolute-value type of nonlinearity. Is the spectral line at the bit rate stronger or weaker than for the square-law type of nonlinearity?
A permanent magnet dc motor has two poles and a simplex lap winding of 18 loops and 3 turns per loop. The armature radius is 4 cm and the armature length is 15 cm. The flux density under the poles is 0.74 T.
Reducing the grid spacing by a factor of 2, determine the midpoint temperature and heat transfer rate. Plot the corresponding temperature distribution across the surface exposed to the fluid. Also, plot the 200 and 250°C isotherms.
a. A load consumes 150kW with a power factor pf = 0.7 (lagging). If the load current is 240A (RMS), find the load voltage. b. An industrial plant has an inductive load which consumes 10kW of power from a 220VRMS line.
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