Please circle TRUE or FALSE for each statement. (a) The voltage in a power syste
ID: 2266297 • Letter: P
Question
Please circle TRUE or FALSE for each statement. (a) The voltage in a power system may vary in magnitude, frequency and/or phase even under TRUE FALSE normal operations. (b) For weak signals, it is usually better to apply uniform quantization in order to achieve a TRUEFALSE relatively high signal to quantization error ratio. (c) In DFT, the length of the window (in seconds) is the only factor determining the frequency TRUEFALSE resolution of the analvsis. (d) A discrete-time system can be uniquely determined by the poles and zeros of its transfer TRUE FALSE function. (e) To modify the sampling rate of a signal by a fractional number, it does not matter whether TRUE FALSE the interpolator or the decimator goes first. (f) For any given parametric signal model, the variance of any unbiased estimator of the pa TRUE FALSE rameters cannot be less than the Cramer-Rao bound (g) When power generation exceeds power consumption, the generators will accelerate. The TRUEFALSE result will be increased frequency. (h) When DC decaying component is present in the power system signal, the larger the time constant of the DC component, the more difficult it is to obtain an accurate phasor estimate TRUE FALSE at the fundamental frequency. (1) The main source of waveform distortion in power systems is harmonics, inter-harmonics TRUEFALSE and sub-harmonics. (j) If there are very few inter-harmonics, then the harmonic grouping and subgrouping results TRUE FALSE will differ a lot.Explanation / Answer
(a). True
An AC signal varies with magnitude, frequency and phase. Only dc signals are independent of frequency and phase, they only depending on magnitudes.