List of top Electrical and Electronic Measurements Questions on Bridges and Potentiometers

The induced EMF in a 3.3 kV, 4-pole, 3-phase, Y-connected synchronous motor is considered to be equal and in phase with the terminal voltage under no-load condition. On application of a mechanical load, the induced EMF phasor is deflected by an angle of 2 degrees with respect to the terminal voltage phasor. If the isochronous reactance is 2 ohms and the series resistance is negligible, the motor armature current magnitude, in amperes, during loaded condition, is closest to:

The maximum percentage error in the equivalent resistance of two parallel connected resistors of 100 ohm and 900 ohm, with each having a maximum 5% error, is:

Four strain gauges $R_A, R_B, R_C, R_D$ (nominal $R$) are in a bridge. Under force: $R_A$ and $R_D$ increase by $\Delta R$, $R_B$ and $R_C$ decrease by $\Delta R$. A potentiometer of total resistance $R_v$ is connected as shown to rebalance the bridge. If $R=100~\Omega$ and $\Delta R=1~\Omega$, the minimum $R_v$ required to balance the bridge is _____ $\Omega$ (rounded off to two decimal places).

Inductance is measured by