An e.m.f. represented by e = 100 sin 100 π t is impressed across a circuit consisting of 40Ω resistor in series with a 40μF capacitor and a 0.25 H indicator. The rms value of current is

The r.m.s. value of the voltage defined by e = 5 + 5 sin (314 t + π/6) is____V

The reactance offered by a capacitor to alternating current of frequency 50 Hz is 10Ω. If frequency is increased to 100 Hz reactance becomes_____Ω.

Three 100Ω non-inductive resistances are connected in star across a 400-V, 50-Hz, 3-phase mains. Calculate the power taken from the supply system in the event when one of the three resistances getting open-circuited is

The phase impedance of balanced star conned load is (40 +j30) the power delivered is 100 W, what will be power delivered if the load is connected in delta instead of star.

A resistance of 20 Ω, an inductance of 0.2 H and a capacitance of 100 μF are connected in series across 220-V, 50-Hz mains. The current in the circuit is______A

A coil takes a current of 6 A when connected to a 24 V dc supply. To obtain the same current with a 50 Hz ac supply, the voltage required was 30V. the power factor of the coil is _______

An inductive coil of resistance 15 ohms and inductive reactance 42 ohms is connected in parallel with a capacitor of capacitive reactance 47.6 ohms. The combination is energized from a 200 V, 33.5 Hz a.c. supply. The total current drawn by the circuit is

A series R-L-C circuit is excited from a constant-voltage variable frequency source. The current in the circuit becomes maximum at a frequency of 600/2π Hz and falls to half the maximum value at 400/2π Hz. If the resistance in the circuit is 3 Ω, inductance of the circuit 

A 3-phase balanced load which has a power factor of 0.707 is connected to a balanced supply. The power consumed by the load is 5 kW. The power is measured by the two-wattmeter method. The readings of the two wattmeters in KW are