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Assignment - Theoretical WorksheetSection 3 (Assessment Criteria 3.1)
1. a) Draw the Schematic diagram of a Power Supply with the following specification:230V Input VoltageDouble Pole On / Off Switch1A Input Fuse8A Output FuseTransformer2 x 120V primary windings2 x 12V secondary windingsFull wave rectificationCapacitor SmoothingTransistorized Voltage StabilizationOutput = 12V @ 8 Ampsb) Show how an LED with Vf = 1.7V and Vf = 10mA can be connected to indicate the presence of an output voltage .c) Explain how the above circuit would be built into an enclosure employing Class I protection.
2. a) Obtain and provide a printed table of preferred value resistors for generalpurpose design circuits.b) Using only preferred values of resistors and the Class A Amplifier Circuit defined in Section 2 Q4, complete the design given the following parameters: Load Current = 5mAVoltage across RE = 2VLowest input frequency = 50 HzTransistor:hfe = 50 Vice = 4V Vbe = 0.5VFind preferred values for R1, R2, RL, RE and CE b) Draw the complete schematic.
3. a) Show how a switch and resistor can be used to create a logic level 1 or 0 for a digital input circuit.b) Obtain a data sheet for a Passive Infra Red Detector and show how it can be configured to provide a logic level 1 when it detects the presence of a person in a room.c) Obtain a data sheet for a light sensor module and show how it can be configured to provide a logic level 1 when the outside light level is in darkness.d) Design a Logic circuit to give a logic level 1 when it's dark outside and a person has just walked into a room.e) Show how the above circuit could be used to switch the room light on using an isolation relay using a Field Effect Transistor.f) Explain why the light sensor cannot be placed in the same room as the person.g) Explain the difference between CMOS and TTL Logic families
y[n]=x[n]+0.8x[n-5000]+0.6x[n-8000] a) Find the delay in seconds for each echo if the sampling rate is Fs=10000 Samp/sec. Td1 and Td2 a) Find the unit sample response for the filter written as the sum of delayed unit-samples.
A 440-V three-hase Y-connected synchronous motor has a synchronous reactance of 1.5 ohms per phase. The field current has been adjusted so that the torque angle is 28 degrees when the supplied power to the motor is 90kW.
Two bars of silicon, one n-type and one p-type, are uniformly doped so that ND(bar1) = NA(bar2) = 3.7x1016 cm-3. a) Without calculations: which bar will exhibit the larger resistivity and why
An amplifier has three amplification stages and a 1-dB attenuator in cascade. Assuming that all impedances are properly matched, what is the overall gain if the amplification factors are5, 10, and 6dB
Identify three types of electrical or electronic components currently used in business or industry today that use voltage regulators in their operation. Discuss some of the problems that can be experienced if the input voltage to the electroni..
An RLC circuit consists of a 25 mH inductor, a 0.001 µF capacitor and a variable resistor connected in series. The initial charge on the capacitor at t = 0 when the switch is closed is 1 mC. What is the critical resistance Rc for this circuit.
Suppose that we define the value of the complex constant A as A = -2 + 2j. Write the constant A in magnitude-angle form, that is, find |A| and A such that A = |A|ej A Sketch the real part of the function z(t), where z(t) = Aej(500pit+pi/2).
A certain 15 V dry-cell battery, completely discharged, requires a current of 100 mA for 3 hr to completely recharge. What is the energy storage capacity of the battery, assuming the voltage does not depend on its charge status
20 SI fibers, 2 km long each, are spliced together for a 40 km link. Each fiber has a loss rate of 1-dB/km and a numerical aperture of 0.24. Each splice adds 0.5 dB of loss. A laser diode has a threshold current of 10 mA and emits at 3 mW/mA rate.
The change in entropy when an unknown mass of water at 100°c is vaporized and converted to steam at 100 °c is 6.05 x 103 J/K. Find the mass of water
Write the theoretical Power Spectral Density for a BPSK signal with shift angle of 180 degrees, carrier of 25 kHz and bit rate of about 1 kHz that has been spread by a PN sequence with a bit rate of about 100 kHz. State it or derive it.
Design a 4-bit "adder/subtractor/comparator" circuit with inputsand outputs. it will have as inputs a control input SUB/ADD' amdtwo four-bit two's complement numbers, A4-A1 and B4-B1. It will have as outputs a four-bit two's complement number S4 -..
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