Electrical Engineering Questions and Answers February 26, 2020

For a bcc lattice structure with a lattice constant of 3 , calculate the separating distance between the nearest atoms, the radius, and the volume of each atoms. Also find the maximum packing fraction.

A distance relay is connected with the area of operation in the R-X plane that is common to i. a Mho relay of radius 15 and, ii. an off-set Mho relay with center (5, 7) and radius 9 . a) Determine the length of the transmission line whose impedance angle is 750, that would be covered by the combined relay. b) What is the resistance of a fault

A full adder has the following truth table for its sum (S) and carry (Co) outputs, in terms of its inputs, A, B and carry in (Ci) Ci Co 1. 0. 0. Derive expressions for S and Co using only AND and OR operators. Hence write a VHDL description of a full adder as a netlist of AND and OR gates and inverters. Do not include any gate delays in your

Write a VHDL testbench to test all combinations of inputs to the full adder Exercise 3.5. Verify the correctness of your full adder and of the testbench using a VHDL simulator. Data From Exercise 3.5:

A full adder has the following truth table for its sum (S) and carry (Co) outputs, in terms of its inputs, A, B and carry in (Ci) Ci Co 1. 0. 0. Derive expressions for S and Co using only AND and OR operators. Hence write a VHDL description of a full adder as a netlist of AND and OR gates and inverters. Do not include any gate delays in your

A normalized sinusoidal signal a(t) has a bandwidth of 5, 000 Hz and its average power is s an average power of 50W. Determine the average power of 0.5W. The carrier Acos2rfct ha of the modulated signal if t ne following analog modulation scheme is employed (a) single-sideband modulation with suppressed carrier modulation (SSBSC), which is

A sinusoidally modulated ordinary AM waveform is shown below. 3 (a) Determine the modulation index. (b) Calculate the transmission efficiency. (c) Determine the amplitude of the carrier which must be added to attain a modulation index of 0.3. 3.

The efficiency u of a singletone AM signal is defined as the percentage of the total power carried by the sidebands, that is u x100 P, where Psig is the power carried by the sidebands and P, is the total power of the AM signal. (a) Find u for AM modulation index ma0.5. (b) Show that for a singletone AM, max is 33.3 at ma 1.

The output signal from an AM modulator is: s(t) = 5cos(1800 t) + 20cos (2000 t) + 5cos (2200 t) (a) Determine the modulation index. (b) Determine the ratio of the power in the sidebands to the power in the carrier.

A radio receiver used in the AM system is shown below. The mixer oscillator of frequency fio. The broadcastband frequencies range from 540kHz to 1600kHz. (a) Determine the range of tuning that must be provided in the local oscillator (i) when fio is higher than f. (superheterodyne receiver) and (ii) when fio is lower than fo. (b) Based on the

Consider the following circuit: (i) An upper-sideband single-sideband (SSB) can be generated by feeding a message signal m(t) into the input port of the above circuit. This is known as phase-shifted method for SSB signal generation. Determine the modulated signal s(t) at the output port. (ii) Suggest one appropriate modification of the above

Iut. Port cos ot uut Port T2 phase shifter mixer oscillator at carrier frequency o,