CST 212 UNLV Electrical Circuit Analysis Questions

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cror2231

Engineering

CST 212

University of Nevada Las Vegas

CST

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I need answers and all work shown by noon tommorow. Needs to be in word format to be submitte

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CST 212 Exam 1 1. A) Determine the angular velocity of a sine wave having a frequency of 100 Hz. B) What is the phase relationship between the sinusoidal waveforms of each of the following sets? Sketch the i and v waveforms • V = 10 sin(ωt + 10), I = 5 sin(ωt + 40) • V = 30 sin(ωt – 70), I = 20 sin(ωt + 20) 2. Write the analytical expression for the waveforms with the phase angle in degrees. 3. The current through a 0.1 H coil is provided. Find the sinusoidal expression for the voltage across the coil. Sketch the v and i curves. a) i = 10 sin 377t b) i = 7 sin(377t - 70°) 4. Determine the capacitance in microfarads if a capacitor has a reactance of • 250  at f = 60 Hz. • 55  at f = 312 Hz. • 10  a t f = 25 Hz. 5. For the circuit in Figure: a) Determine I, VR, and VC in phasor form. b) Calculate the total power factor, and indicate whether it is leading or lagging. c) Calculate the average power delivered to the circuit. d) Draw the impedance diagram. e) Find the voltages VR and VC using the voltage divider rule and compare them with the results of part(a) above.
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Explanation & Answer

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CST 212 Exam 1
1. A) Determine the angular velocity of a sine wave having a
frequency of 100 Hz.
The angular velocity is
 = 2f =2*100 = 200
B) What is the phase relationship between the sinusoidal
waveforms of each of the following sets? Sketch the i and v
waveforms
• V = 10 sin(ωt + 10), I = 5 sin(ωt + 40)
The phase of V is laggard behind that of I by 30.

``

• V = 30 sin(ωt – 70), I = 20 sin(ωt + 20)
The phase of V is laggard behind that of I by 90.

2. Write the analytical exp...


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I was having a hard time with this subject, and this was a great help.

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