PYQs Based Test - 07 : Measurements

In the bridge circuit shown, the voltmeter V showed zero when the value of the resistors are: R1 = 100 Ω, R2 = 110 Ω, and R3 = 90 Ω. If (R1/R2) = (RA/RB), the value of R4 in ohm is _____.

The power in a 400 V (rms, line-line) three-phase, three-wire RYB sequence system is measured using the two wattmeters, as shown. The R-line current is 5∠60° A. Wattmeter W₁in the R-line will read (in watt) _________.

In the Maxwell-Wien bridge shown, the detector D reads zero when C₁ = 100 nF and Rᵢ = 100 kΩ. The Q factor of the coil is _______

In an ac main, the rms voltage V ${}_{ac}$, rms current I ${}_{ac}$ and power W ${}_{ac}$ are measured as: V ${}_{ac}$ = 100 V ± 1%, I ${}_{ac}$ = 1 A ± 1% and W ${}_{ac}$ = 50 W ± 2% (errors are with respect to readings). The percentage error in calculating the power factor using these readings is

If the deflection of the galvanometer in the bridge circuit shown in the figure is zero, then the value of Rₓ in ohms is _________.