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1. Sketch the circuit symbol for a transformer, and explain its principle of operation. Why is the core made from laminations? Is the core material a ‘ hard ' or a ‘ soft ' magnetic material? Give the reason for this.
2. A transformer with a turns ratio of 20:1 has 240 V applied to its primary. Calculate the secondary voltage.
In the United States, the incomes of specialists such as heart surgeons can easily triple the incomes of primary care practitioners. Use the five forces to offer explanations for this disparity. Can you think of any other possible explanations?
Sketch or use the computer program of your choice to produce a plot of the impedance magnitude versus angular frequency for a 20-mH inductance in series with a 50-μF capacitance. Allow ω to range from zero to 2000 rad/s and the vertical axis to ra..
(a) An average hole velocity of 10^3 cm/sec results when 2 v is appliedaccross a 1 cm-long semiconductor bar. What is the mobilityof the bar (b) name the two dominant carrier scattering mechanisms innondegenerately doped semiconductors of device qu..
Consider the current it takes to power a +5V 74xx245(Icc). What is the qualitative difference between the CMOS devices and the non-CMOS devices and the non-CMOS devices What is the explanation for the difference
A separately excited dc generator produces 400 v at 1500 rpm under open circuit conditions. Find the induced emf if the speed changes to 2000 rpm. Assume the flux is constant.
What are the two possible frequencies to which the local oscillator could be set? What bandwidth should the 10.7 MHz IF amplifier have?
8 bit DAC with a 5 volt reference connects to a light source with an intensity given by Il=45V^(3/2)W/m^2 a. what is the range of intensity that can be produced b. what intensities are produced by digital inputs of 1bh, 7ah,9fh,e5h
A circuit computes the product of two numbers, a 4-bit A[3..0]=A3A2A1A0 and a 3-bit B[2..0]=B2B1B0 which they appear in input. The output P[6..0]=P6P5P4P3P2P1P0 represents the answer (e.g. if A=1011 and B=101 then P=0110111).
Compare the power contained in the sidebands to the total power in the modulated signal. What is the power efficiency in this AM scheme and calculate the PEP supplied by the AM transmitter - Write an expression for the normalized modulating signal.
A three-phase induction motor is required to operate from a single-phase source. One possible connection is shown in Figure P18.28. Will the motor work? Explain why or why not.
A CB transmitter is rated to supply 4 W of carrier power to a 50 Ohm load while operating from a power supply that provides 13.8 V. The nominal supply current is 1 A without modulation and 1.8 A with 80 % modulation.
Analyze the synchrounous circuit with input X and output Z constructed with two flip flop of JK type with outputs QA and QB. The flip flop input exciatation are as follows: JA=XQB; KA=0; Jb=XQA'; KB=QA. the output equation is Z=XQB'.
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