PYQs Based test 17: Electrical & Electronic 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 _______

A dc potentiometer, shown in figure below, is made by connecting fifteen 10 Ω resistors and a 10 Ω slide wire of length 1000 mm in series. The potentiometer is standardized with the current Iₚ = 10.0000 mA. Balance for an unknown voltage is obtained when the dial is in position 11(11 numbers of the fixed 10 Ω resistor are included) and the slide wire is on the 234th mm position. The unknown voltage (up to four decimal places) involtis _______.

A current waveform, i(t), shown in the figure, is passed through a Permanent Magnet Moving Coil (PMMC) type ammeter. The reading of the ammeter up to two decimal places is