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Assume that two antennas are half-wave dipoles and each has adirective gain of 3 db.If the transmitted power is 1 w and the two antennas are separated by a distance of 10 km,what is the received pow
a four pole, series motor runs at 900rev/min when taking 30A from a 230V supply. the total resistance ofthe armature and the series field is 0.8Ω. Calculate the additional series resistance re
The starter motor on a car draws 75-A starting current, which lowers the batery voltage from 12.6 to 9.1 V. What would be the battery voltage if it were being charged at 30 A.
Consider an electric circuit consisting of a parallel RC circuit,where the resistance R is one kilo-ohm and the capacitance is 100 microfarads. A current source Is(t) is applied in parallel to the r
A circuit is needed to display a 4-bit value on the LED's of a logic designer. This value can come from two differentsources. Design a circuit using four 2-to-1 muxes to select which of the two valu
A universal shift register can shift in both the left-to-right andright-to-left directions, and it has parallel-load capability. Draw a circuit for such a shift register.
The conductance of a wire is 100 S. If the area of the wire is increased by 2/3 and the length is reduced by the same amount, find the new conductance of the wire if the temperature remain fixed.
The overall gain of a -ve feedback amplifier is 100. If the gain of the amplifier device itself is 1000. a) find the loop gain b) calculate the feed back factor β c) how much percentag error resu
A 24-volt automotive battery is connected to two headlights, such that the two loads are in parallel; each of the head lights isintended to be a 75-W load, however, a 100-W headlight is mistakenly i
a) Determine thecurrent through each element and the total power taken by thes eries combination and the power factor of the combination. b) Using the supply-voltage phasor as the reference, sketch a
What is the purpose of connecting a transistor and a capacitor together in one circuit and applying different frequencies
In lab, the instructor told us to build an inverter connected to a capacitor on the output and then view the results on the oscilloscope. What is the purpose of doing this even a t different frequen
name several methods for ISI mitigration. How does ISIdepend on the carrier frequancy, symbol rate, and movement ofsender/receiver what are the influences of ISI on TDM schemes
Consider a cellular phone transmits data using QPSK with achannel rate of 50 Kbps, (a) what is the data rate provided (b)What is the difference between PSK and QPSK.
If the 48 bit blocks are buffered until 10blocks are collected and then they are interleaved and transmitted,what is the maximum error burst size that can be tolerated andstill have correct receptio
An intercom system has a 13 kHz annoying whistle with amplitude of 20% of a typical voice signal. Assume that a typical voice signal has a frequency of 3 kHz and the intercom's output for a typical
A plant expansion is planned in which 4 morelarge 4-kV motors must be added to the system. The current switch gear can not supply all 10 motors, because both the switch gear bus rating and the trans
Source configurations can be combined to increase operating and maintenance flexibility. Sketch a hybrid primary-secondary selective system. Describe how the system would operate in the event of a.
An industrial plant is to be supplied by three identical transformers. A decision must be made whether to purchased afourth transformer to build a sparing transformer system oralternatively, to conf
Design a metering circuit to measure the line-to-neutral voltage and line currents on a three-phase four-wire, 4.16-kVswitchgear main circuit breaker rated at 2000 amperes.
A three-phase four wire 480Y /277 volt service is sized to carry 375 amperes per phase. Sketch a metering circuit,including instrument transformers, that provides line-to-neutral voltage, phase curr
Design a circuit that given a 4-bit BCD digit(0-9) will produce a 2-bit quotient and a 2-bit remainder for a division by3. This circuit will have four inputs--the four bits of the BCD digit--and fou
A 138-kV, three-phase short transmission line has a per-phase impedance of (2+j4) ohms. If the line supplies a 25-MW load at 0.8 power factor lagging, calculate (a) the efficiency and (b) the sendin
A person accidentally grabs conductors connected to each end of adc voltage source, one in each hand. Assume that the resistance of an arm is 400Ohms, the resistance of a leg is 200 Ohms and the resis
At what frequency does an RC low pass filter attenuate by 6dB(output voltage equal to half the input voltage) What is the phase shift at that frequency