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Electrical Engineering Questions and Answers December 03, 2019

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1. Consider the single phase converter shown in Fig. P65 (textbook Ned Mohan, page 155). The input voltage is 120 V, 60 Hz. The output DC current, I, is equal to 20A. For the firing angle of a30, 90 and 150, determine the following (a) The input power. (b) The input power factor. (c) The total harmonic distortion. (d) The average output voltage,S
Consider the single phase converter shown in Fig. P6-5 (textbook- Ned Mohan, page 155). The input voltage is 120 V, 60 Hz. The output DC current, L is equal to 20A. For the firing angle of a -30, 90 and 150?, determine the 1. following: (a) The input power. (b)The input power factor. (c) The total harmonic distortion. (d) The average output voltagemedia%2F4ae%2F4aeb46b4-8a30-4cc9-8f25-d4

(a) Consider discretetime signals x n and x n respectively given as x n 28n 2 un un 2, x nun 1 un 2 28n 3. and (i) (ii) Sketch the waveforms of x n and x n. Find the convolution x n x n. (b) Consider continuoustime signals x (t) and x (t) respectively given as (t1 x (t) 2 0 1 t 0 0 t 2, otherwise x (t) u(t) u(t 2). Find the
(a) Consider discrete-time signals x [n] and x2[n] respectively given as x,[n] = 28[n + 2] + u[n] - u[n ? 2], and x2[n] = u[n

In buckboost converter, the duty ratio is adjusted to regulate the output voltage Vo at 30 V. The input voltage varies in a wide range from 30 to 50 V. The output power is 100 W. The inductor L 300 H and the switching frequency is 50 kHz. The converter always operates in continuouscurrent mode. (a) Derive the expression for voltage conversion
In buck-boost converter, the duty ratio is adjusted to regulate the output voltage Vo at 30 V. The input voltage varies in a

a) Is this a valid prefix code If yes, build the prefix tree according to the table above if no, explain why not b) Now, use Huffman code to assign new codewords to the symbols (AG) above. Follow the convention that the groupsymbol with higher probability is assigned a 0 and that with lower probability is assigned a 1. List out all the codewords

In free space, E 20 cos (wt 50x) a Vm. Calculate (a) J (b) H (c) w

In the circuit of Fig. 1.27, V,(t) and Vo(t) are voltages (at time ) and R, and R are resistors. There is also an ideal diode that acts as a short circuit when V is positive and as an open circuit when v, is negative. We view V, and Vo as the system input and output, respectively. (a) Determine an inputoutput description of this system. (b) Is
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A company has multiple production lines containing a great number of induction motors and other inductive loads, resulting in a low power factor. When the company is operated at its full production capacity, the total power consumption is 2 MW and the power factor 0.65 lagging, but the grid power supply requires the power factor to be no less than