Comment on the change in the transmission coefficient curve as the barrier length changes. How a signal propagates in the frequency domain. block diagram of the receiver in a DSSS system. the signal is demodulated at the receiver side. If the relay in the leakage path of the differential relay is set to take 0.4 Amp, try.
There are FOUR questions in this section. a) What are the disadvantages of the simple differential relay. How to adjust the slope of the operating characteristics of an analog percentage differential relay. Calculate area, clock frequency and dynamic power. spread of the chip in the 90 nm process.
For each of the following sequencing styles, determine the maximum logic propagation delay available within a clock cycle of 500 ps. Write the meaning of the following file format and explain where the files are used in the design flow: LEF, DEF, ESPF, and SDF.
EEE 457
Show the schematic diagram of the PRSG you want to use in your circuit and write the sequences it will. a) Write the expression for total power loss of an integrating circuit incl. dynamic, short circuit and leakage effect. The system will be used as a push button for a pedestrian crossing and the functionality is Write the state diagram, state table, state assigned table and derive the logic expression and show the implementation of the sequential circuit.
Write system verilog code for FSM and also write a test bench in system verilog to test FSM. If the load current to be supplied is 5 rnA, find (i) the percentage ripple, (ii) the regulation and (iii) the optimum number of steps for minimum regulation or voltage drop. a) Explain the negative corona discharge phenomena. Find the value of AC critical starting voltage, Eo, when the air pressure is 100 kPa and the air temperature is 20°C.
SECTION -B
EEE 483
Sylnbols have their usual meanings. a) Define the linear time-variant impulse response of a wireless channel and find the corresponding one. expression for a multipath propagation environment. Explain the channel behavior for the following cases: (10) (i) signal bandwidth higher than coherence bandwidth; (ii) symbol duration less than. a) What is meant by co-channel interference (CCI) and how does it occur in a mobile cellular communications system. A cellular communications system with a hexagonal cell structure requires a minimum CICCI of 23 dB at a location where path loss exponent y =3.5. iii) Cell coverage and cluster coverage. a) What is the purpose of multiple access techniques in a mobile cell phone.
Explain the operating principles of the following techniques: (10) (i) FDMA-TDD, (ii) TDMA-FDD, (iii)TDMA-TDD, (iv) OFDMA-FDD. b) Determine the spectral efficiency of a TDMA and FDMA cellular system. A cellular communication system operates in FDMA-FDD with a two-way system bandwidth of 50 MHz.
EEE 439
USE SEP ARA TE SCRIPTS FOR EACH SECTION SECTION -A. There are FOUR questions in this section. The limiting probabilities for each state. ii) System availability. iii) The MITF whose state 1 is normally up state, state 2 is a standby state and state 3 is the fault state. a) Introduce the concept of 'energy index of reliability'. What are its advantages over. loss of load expectation' index used to generate capacity reliability rating.
EEE 479
A power system planner proposes a plan consisting of two generating units with capacities of 20 and 30 MW with FOR of 10% and 20% respectively. What will be the load carrying capacity of the new unit. a) What are the conditions that a probability distribution function must satisfy in order for a binomial expression to be applicable to that distribution. Components 3, 4 and 5 are not identical and at least one component of this group must be available for the system to succeed.
Components 8, 9 and 10 are identical and for this particular set it is necessary that two of the three components function satisfactorily for the success of the system. For a system with n components, write the expression for 'Reliability' and 'No reliability' if the components are in parallel. Plot the reliability characteristics (Reliability vs. number of components) for the series and also for the parallel system.
Show a schematic energy-momentum diagram for GaAsl-xPx and discuss the composition dependence of the direct and indirect energy gaps for the GaAs]-xpx system. What is the wavelength for maximum emission at 325 K? a) Draw the equivalent circuit of a solar cell and explain the importance of the elements used in the circuit.
EEE 459
BANGLADESH UNIVERSITY OF ENGINEERING AND TECHNOLOGY, DHAKA L-4/T-2 B. Figures in the margin indicate full marks. What are the numbers that your friend who lives in the UK should dial to make a phone call to you. For the multi-stage coupling system shown in fig. i) the total number of intersections expressed in k, n and N,. ii) the total number of non-blocking intersections in terms of nand N, (iii) the optimal number of non-blocking intersections in terms of N, and. iv) the blocking probability using the Lee graph, given that an inlet is occupied with probability P.
EEE 441
Draw the block diagram of satellite communication. repeater and explain the functions that each block performs. What are the limiting factors considered in a satellite system design. the effect of rain is mitigated. Satellite receiver bandwidth = 560 MHz Receiver noise temperature =300K. Oblique range of satellite from earth station =60,000 km Atmospheric loss =6 dB. i) Power received by the satellite receiver;. ii) Carrier wave/noise ratio at the input of the satellite receiver;. iii) Uplink path loss. a) Draw the architecture of a mobile cellular communication system and state. functions of VLR, HLR, BSC and MSC.
A mobile cellular communication system with a hexagonal cell structure requires a minimum SIR of 23 dB at a location where the path loss exponent is 3.5. There are FOUR questions in this section. a) Explain vertically integrated grid, electricity market and smart grid. Determine the market charge price (MCP) and social welfare (SW) for an hour by showing the details of the calculation process.
Suppose there is no restriction on the slope limit and minimum output power of the units managed by GenCos. a) What do you mean by system security.
EEE 481
There are FOUR questions in this section. a) Why power system control is necessary for Bangladesh. Five ammeters numbered Al to As are used in the direct current circuit of fig. 6 to determine the two unknown source currents II and Iz. A for meters A2 and As, and 0.1 A for the other three meters. a) Determine the weighted least squares estimates of the source currents II and 12. Application.
In a small power system there are two phases (each 4 hours long) in a load cycle and 4 generating units. 7 calculates the power supplied by the generators if the X4 combination is used and the corresponding production cost at the economic loading of the units when the system is in the last stage. Generation of Min Max ai bi Ci. a) Explain with a block diagram computer controlled AGC of a given area in a power system.
For economic reasons, area C imports 500 MW of its load needs from area B and 100 MW of its node passes over the interconnectors of area A, which itself has no planned exchanges. The frequency bias setting of the areas is. i) Determine the frequency deviation and generation changes of each area. when a fully loaded 400 MW generator is taken out of service in area B. ii) Determine the ACE of each area before the AGC action begins. iii). If the AGC action is delayed by 10 minutes, find the difference between the system time and the standard time.
EEE 425
USE SEPARATOR SCRIPTS FOR EACH SECTION SECTION -A. There are FOUR questions in this section. When finding the root of a nonlinear equation using the Newton-Raphson method, if. When we get a new approximation of the root, indicate which of the previous three points should be discarded.
Show calculations for three consecutive approximations only. a) What are pivots when solving a system of linear equations.
EEE 423
There are FOUR questions in this section. a) Design an Ayrton shunt to make an ammeter with current ranges of 10 rnA, 100 rnA and 500 rnA for a meter movement with a full scale deflection current of 1 rnA and an. 1(b) uses a 1 rnA meter movement with an internal resistance of 200 O. The shunt resistance Rsh across the movement is 400 O. Diodes D] and D2 each have a forward resistance of 1000, zero cut-in voltage and infinite reverse resistance . i) Explain the function of the resistor Rsh' (ii) Explain the function of the diode D2. iii) Calculate the values of series resistors R1,R2 and R3, if the required meter ranges. iv) Determine the sensitivity of the AC voltmeter. a) When connected in the circuit, as shown in the Fig. 10) (b). A half-wave rectifier-based AC voltmeter with a 1OO-~A meter movement is used. in its 15 V range to measure voltage Va, as shown in the Fig. minimum voltage to be observed, if the meter accuracy:t is 5%fsd. 13) (c) Derive the expression for the output analog voltage of a one-bit R-2R ladder type DAC. a) What are the advantages and disadvantages of single phase induction type energy meters.
The resultant of magnetizing and iron loss components of the primary current associated with a full load secondary current of 5 A at a load of 1.0 0 (non-inductive) is 3 A at a power factor of 0.4.
EEE 427
For an ideal lossless transmission line, determine its current and voltage equations, reflection coefficient, voltage standing wave ratio, phase constant and input impedance in terms of line parameters. Find the load impedance and input impedance if VSWR is 1.5. a) Design a double-stub shunt tuner to match a load impedance ZL =60-j80 nline. The following two-step procedure has been performed with a 50 ncoaxial slot line to determine an unknown load impedance. I).
A short circuit is placed on the load plane, resulting in a standing wave on the line with an infinite SWR and sharply defined voltage minima. ii).
EEE 433
U(B) = {BCOS2 B ,
The Complete Smith Chart
Black Magic Design
