PYQs Based Test - 07 : Measurements

In the potentiometer circuit shown in the figure the expression for Vₓ is

The current coil of a 200 V, 5 A, electrodynamoter type LPF wattmeter carries a current of √2 cos(100 πt) A. The voltage across the pressure coil is √2 sin(100πt)V. The meter will indicate

A 1000/1 A, 5 VA, UPF bar-primary measuring current transformer has 1000 secondary turns. The current transformer exhibits a ratio error of 0.1 % and a phase error of 3.438 minutes when the primary current is 1000 A. At this operating condition, the rms value of the magnetization current of the current transformer (in amperes, rounded off to two decimal places) is

The real power drawn by a balanced load connected to a 400 V, 50 Hz, balanced, symmetrical 3-phase, 3-wire, RYB sequence mains is measured using the two-wattmeter method. Wattmeter W₁ is connected in the R line and wattmeter W₂ is connected in the B line. The line current is measured as $\frac{1}{\sqrt{3}}$ A. If the wattmeter W₁ reads zero, the reading on W₂ (in watts) is

The unbalanced voltage of the Wheatstone bridge, shown in the figure, is measured using a digital voltmeter having infinite input impedance and a resolution of 0.1 mV. If R = 1000 Ω, then the minimum value of ΔR in Ω to create a detectable unbalanced voltage is ________.