For the waveform below (#1 #3), Multiple Choice Questions: 3 pts each AN 1. What
ID: 2266761 • Letter: F
Question
For the waveform below (#1 #3), Multiple Choice Questions: 3 pts each AN 1. What is the peak-to peak value? a. 200 mA b. 400 mA C.OA d. 200A e. 400 HA 2. What is the frequency) of the waveform? a. 250 mHz b. 500 mHz c. 250 Hz d. 250 kHz e. 500 kHz 3. What is the effective (rms) value of the waveform? a. 141.4 A b. 200A C. OA d. 141.4 mA e. 200 mA The phase relationship of the voltage and current of a resistor is a. current lags the voltage by 90°. b. current leads the voltage by 90°. c. current and voltage are in phase. d. voltage lags the current by 90°. 4.Explanation / Answer
1. (e) Peak-to-peak amplitude is nothing but the change between highest amplitude value and lowest amplitude value, which in the above case would be 200 microamps - (-200 microamps) = 400 microamps.
2. (d) Frequency is nothing but no. of cycles per unit time i.e.f=1/T
for the given waveform T is 400 microseconds so frequnecy would be f=1/(400 microseconds) = 250 KHz.
3. (a) RMS Value of a waveform = (Maximum value /Square root 2)
for the given sinusoidal waveform RMS = (200 micro amps/ square root of 2) =141.42 microamps.
4. (c) Current and volatge are in phase for a resistor in an ac circuit. This is by fact.