List of top Electrical and Electronics Measurements Questions

A 1.999 V True RMS 3-1/2 digit multimeter has an accuracy of $\pm0.1 %$ of reading $\pm 2$ digits. It is used to measure 100 A (RMS) current through a line using a 100:5 ratio Class-1 CT with burden $0.1~\Omega \pm0.5%$. The worst-case absolute error in the multimeter output is _____ V (rounded off to three decimal places).

The voltage source $v_s=10\sqrt{2}\sin(20000\pi t)$ V has an internal resistance of $50~\Omega$. Find the RMS current through the $R=25~\Omega$ resistor (rounded to one decimal place).

When the bridge shown is balanced, the current through the resistor $R_a$ is________ mA (rounded off to two decimal places). The bridge has $R_a=R_b=R_c=10~\mathrm{m}\Omega$ and the detector (galvanometer) is ideal/open at balance; the source is $1~\text{V}$.

A 3-phase, star-connected, balanced load is supplied from a 3-phase, 400 V (rms), balanced voltage source with phase sequence R-Y-B, as shown in the figure. If the wattmeter reading is –400 W and the line current is \(I_R = 2 \, \text{A (rms)}\), then the power factor of the load per phase is: \begin{center} \includegraphics[width=0.65\textwidth]{17.jpeg} \end{center}