BARC EE : Measurement Quiz-2

A 1-φ, 230 V energy meter has a meter constant of 400 rev/kWh. Find number of revolutions made by the disc at a load current of 20A 0.86 lagging power factor.

Hay’s Bridge

Which of the bridge balancing equations doesn’t contain frequency component ?

1). Maxwell’s inductance bridge 2). Maxell’s inductance capacitance bridge

3). Hay’s bridge 4). Anderson’s bridge

5). Owen’s bridge 6). Schering bridge

The value of “Δr” to get a deflection of 0.5 mV is

The value of “Δr” under balanced condition

What is the reading of 0.1234 volts on 10 V, 100 V range in  digit DVM?

The resolution of  digit DVM on 10 V range is _________

The resistor’s R1 = 37 Ω ± 5%, R2 = 50 Ω ± 5% and R3 = 75 Ω ± 5% are connected in series. Find the equivalent resistance and it’s % limiting error.

A (0 – 5) mA Ammeter with internal resistance of 500 Ω is used to design a DC voltmeter of full scale voltage of 50V. The value of require external resistance.

A current i(t) = –5 + 10 sin (300t + 60°) is passed through a zero centre PMMC and MI instruments. The possible readings are