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A perfectelectric dipole is directed along the z-axis. Inconventional spherical polar coordinates, at what values of the"dangle angle" q does the electric field have no z-component?
A discrete-time signal x[n] is periodic with period 8. One period of its DFT harmonic function is {X[0],...,X[7]}={3,4+ j5,- 4 - j3,1+ j5,- 4,1- j5,- 4 + j3,4 - j5}. (a) What is the average value of x[n] (b) What is the signal power of x[n]
A cylindrical brass sleeve is to be shrink-fitted over a brass shaft whose diameter is 3.216 cm at 0°C. The diameter of the sleeve is 3.203 cm at 0°C. (a) To what temperature must the sleeve be heated before it will slip over the shaft
Suppose that a current source is feeding an amplifier with input resistance of 5k ohms. The current source can be approximated with it Norton equivalent circuit delivering Norton current of I=50mA and having a resistance of 10k ohms.
A synchronous motor has a per-phase voltage of 220V and a synchronous reactance of 10. (a) If it draws a total input power of 7.5kW at a torque angle of 30 deg, calculate the per-phase induced voltage, input current and power factor.
Determine the 8-bit sign-and-magnitude, 1's complement, and 2's complement representations for each of the following decimal numbers: +36, -84. (Note: Be sure to represent +36 as a positive number and -84 as a negative number.)
An LVDT is used in an accelerometer to measure seismic-mass displacement. The LvDT and signal-conditioning output is 0.31 mV/mm with a +/-2 cm maximum core displacement.
Design a circuit that will multiply the input voltage by +12. That is the output voltage is 12v1 where v1 is the input voltage. All resistors should be at least 12ohms.
A 5-volt intelligence amplitude causes the frequency to change to ± 25 kHz. What will be the carrier frequency variation corresponding to an intelligence amplitude of 10 volts
What is the motor efficiency as operated?
A silicon ingot is doped with 1016 arsenic atoms/cm3. Find the carrier concentrations and the Fermi level at room temperature (300K). Hint: assume complete ionization of impurity atoms at room temperature.
Heat is added until the final volume is twice the initial volume. Assume that Helium behaves as an ideal gas. Use the table provided to determine the specific heats of helium and determine the following.
A unit for a telecommunications system is to be designed so as to have a minimum availability of 0.9994. The MTTR (mean time to repair) for the unit is estimated to be 24 hours.
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