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A dc motor is driven from a chopper with a source voltage of 24V dc and at a frequency of 1 kHz. Determine the variation in duty cycle required to have a speed variation of 0 to 1 p.u. delivering a constant 2 p.u. load. The motor details are as follows: 1 hp, 10V, 2500 rpm, 78.5 % efficiency, Ra=.01 O, La=.002 H, Kb= .03819 V/rad/sec. The chopper is one quadrant, and the on-state voltage drop across the device is assumed to be 1V regardless of the current variation.
2. What is the sampling period 3. What is the bit time 4. What is the bit rate of that system 5. What is the time allotted to each channel
design a circuit using an inverting amplifier that will produce a +- 10-V output signal corresponding to the bed position and deliver it to a 1k load. The output should be 0V at when the bed is in the center position
1. Calculate the Fourier transform of f(t)=5 sinc ([t-0.2]/2), and graph the magnitude and phase as function of f. 2. A military satellite uses 10 GHz for the downlink frequency. The distance to the satellite is approximately 36000 km.
Let x(t) = cos(3/4(t+1/2)+1/4) a. Determine the frequency, the period of x(t) b. Given another signal, y(t)= sin(3/4(t+1)+3/8), is y(t) identical to x(t) Why
A 15 hp, 209V,three-phase,six pole, Y-connected induction motor has the following parameter values per phase: R1= 0.128 ohm, R'2=0.0935 ohm Xeq- X1 + X'2 = 0.49 ohm. The motor slip at full load is 3%, and the efficiency id 90%.
A supplier claims that a transistor has a current gain of 100. 15 transistors are measured, and are found to have a sample mean of 99.5 and a standard deviation of the sample mean 2. a) For what confidence level would the claim be valid
Write a VHDL description of a BCD-to-Binary converter. Initially a three-digit BCD number is placed in the A register. When St signal is recieved, conversion begins, and the resulting binary number in stored in register B.
The power delivered to the element is p(t) = 0.60e-4t W. Compute the current in the element as a function of time, the voltage across the element as a function of time, and the total energy delivered to the element in the time interval 0
Three cells whose open-circuit voltages are each V are connected in series. What is the open circuit voltage of the series connection If the same three cells were connected in parallel
Suppose the FCC allocates 300 kHz channels for a high quality video conference service. A service provider decides that this service requires 720 kbps (not including overhead and error control) for each channel.
Design an analog computer circuit to solve the following differential equation 1)Draw the state flow diagram 2)Design and draw the OpAmp circuit. Show the values for the resistors and capacitors. Label all inputs and outputs
(a) Compute the minimum voltage that the output voltage across R1 falls to when both capacitors C1 and C2 are present. (b) Using the same model for D1, compute the maximum voltage that the output voltage across R1 rises to.
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